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rocksdb/db/external_sst_file_ingestion...

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#ifndef ROCKSDB_LITE
#include "db/external_sst_file_ingestion_job.h"
#include <algorithm>
#include <cinttypes>
#include <string>
#include <unordered_set>
#include <vector>
#include "db/db_impl/db_impl.h"
#include "db/version_edit.h"
#include "file/file_util.h"
#include "file/random_access_file_reader.h"
#include "logging/logging.h"
#include "table/merging_iterator.h"
#include "table/scoped_arena_iterator.h"
#include "table/sst_file_writer_collectors.h"
#include "table/table_builder.h"
#include "test_util/sync_point.h"
#include "util/stop_watch.h"
namespace ROCKSDB_NAMESPACE {
Status ExternalSstFileIngestionJob::Prepare(
const std::vector<std::string>& external_files_paths,
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
const std::vector<std::string>& files_checksums,
const std::vector<std::string>& files_checksum_func_names,
const Temperature& file_temperature, uint64_t next_file_number,
SuperVersion* sv) {
Status status;
// Read the information of files we are ingesting
for (const std::string& file_path : external_files_paths) {
IngestedFileInfo file_to_ingest;
New stable, fixed-length cache keys (#9126) Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f
3 years ago
status =
GetIngestedFileInfo(file_path, next_file_number++, &file_to_ingest, sv);
if (!status.ok()) {
return status;
}
if (file_to_ingest.cf_id !=
TablePropertiesCollectorFactory::Context::kUnknownColumnFamily &&
file_to_ingest.cf_id != cfd_->GetID()) {
return Status::InvalidArgument(
"External file column family id don't match");
}
if (file_to_ingest.num_entries == 0 &&
file_to_ingest.num_range_deletions == 0) {
return Status::InvalidArgument("File contain no entries");
}
if (!file_to_ingest.smallest_internal_key.Valid() ||
!file_to_ingest.largest_internal_key.Valid()) {
return Status::Corruption("Generated table have corrupted keys");
}
files_to_ingest_.emplace_back(std::move(file_to_ingest));
}
const Comparator* ucmp = cfd_->internal_comparator().user_comparator();
auto num_files = files_to_ingest_.size();
if (num_files == 0) {
return Status::InvalidArgument("The list of files is empty");
} else if (num_files > 1) {
// Verify that passed files don't have overlapping ranges
autovector<const IngestedFileInfo*> sorted_files;
for (size_t i = 0; i < num_files; i++) {
sorted_files.push_back(&files_to_ingest_[i]);
}
std::sort(
sorted_files.begin(), sorted_files.end(),
[&ucmp](const IngestedFileInfo* info1, const IngestedFileInfo* info2) {
return sstableKeyCompare(ucmp, info1->smallest_internal_key,
info2->smallest_internal_key) < 0;
});
for (size_t i = 0; i + 1 < num_files; i++) {
if (sstableKeyCompare(ucmp, sorted_files[i]->largest_internal_key,
sorted_files[i + 1]->smallest_internal_key) >= 0) {
files_overlap_ = true;
break;
}
}
}
// Hanlde the file temperature
for (size_t i = 0; i < num_files; i++) {
files_to_ingest_[i].file_temperature = file_temperature;
}
if (ingestion_options_.ingest_behind && files_overlap_) {
return Status::NotSupported("Files have overlapping ranges");
}
// Copy/Move external files into DB
std::unordered_set<size_t> ingestion_path_ids;
for (IngestedFileInfo& f : files_to_ingest_) {
f.copy_file = false;
const std::string path_outside_db = f.external_file_path;
const std::string path_inside_db =
TableFileName(cfd_->ioptions()->cf_paths, f.fd.GetNumber(),
f.fd.GetPathId());
if (ingestion_options_.move_files) {
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
status =
fs_->LinkFile(path_outside_db, path_inside_db, IOOptions(), nullptr);
if (status.ok()) {
// It is unsafe to assume application had sync the file and file
// directory before ingest the file. For integrity of RocksDB we need
// to sync the file.
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
std::unique_ptr<FSWritableFile> file_to_sync;
Status s = fs_->ReopenWritableFile(path_inside_db, env_options_,
&file_to_sync, nullptr);
TEST_SYNC_POINT_CALLBACK("ExternalSstFileIngestionJob::Prepare:Reopen",
&s);
// Some file systems (especially remote/distributed) don't support
// reopening a file for writing and don't require reopening and
// syncing the file. Ignore the NotSupported error in that case.
if (!s.IsNotSupported()) {
status = s;
if (status.ok()) {
TEST_SYNC_POINT(
"ExternalSstFileIngestionJob::BeforeSyncIngestedFile");
status = SyncIngestedFile(file_to_sync.get());
TEST_SYNC_POINT(
"ExternalSstFileIngestionJob::AfterSyncIngestedFile");
if (!status.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to sync ingested file %s: %s",
path_inside_db.c_str(), status.ToString().c_str());
}
}
}
} else if (status.IsNotSupported() &&
ingestion_options_.failed_move_fall_back_to_copy) {
// Original file is on a different FS, use copy instead of hard linking.
f.copy_file = true;
ROCKS_LOG_INFO(db_options_.info_log,
"Triy to link file %s but it's not supported : %s",
path_outside_db.c_str(), status.ToString().c_str());
}
} else {
f.copy_file = true;
}
if (f.copy_file) {
TEST_SYNC_POINT_CALLBACK("ExternalSstFileIngestionJob::Prepare:CopyFile",
nullptr);
// CopyFile also sync the new file.
status =
CopyFile(fs_.get(), path_outside_db, path_inside_db, 0,
db_options_.use_fsync, io_tracer_, Temperature::kUnknown);
}
TEST_SYNC_POINT("ExternalSstFileIngestionJob::Prepare:FileAdded");
if (!status.ok()) {
break;
}
f.internal_file_path = path_inside_db;
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
// Initialize the checksum information of ingested files.
f.file_checksum = kUnknownFileChecksum;
f.file_checksum_func_name = kUnknownFileChecksumFuncName;
ingestion_path_ids.insert(f.fd.GetPathId());
}
TEST_SYNC_POINT("ExternalSstFileIngestionJob::BeforeSyncDir");
if (status.ok()) {
for (auto path_id : ingestion_path_ids) {
status = directories_->GetDataDir(path_id)->FsyncWithDirOptions(
IOOptions(), nullptr,
DirFsyncOptions(DirFsyncOptions::FsyncReason::kNewFileSynced));
if (!status.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to sync directory %" ROCKSDB_PRIszt
" while ingest file: %s",
path_id, status.ToString().c_str());
break;
}
}
}
TEST_SYNC_POINT("ExternalSstFileIngestionJob::AfterSyncDir");
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
// Generate and check the sst file checksum. Note that, if
// IngestExternalFileOptions::write_global_seqno is true, we will not update
// the checksum information in the files_to_ingests_ here, since the file is
// upadted with the new global_seqno. After global_seqno is updated, DB will
// generate the new checksum and store it in the Manifest. In all other cases
// if ingestion_options_.write_global_seqno == true and
// verify_file_checksum is false, we only check the checksum function name.
if (status.ok() && db_options_.file_checksum_gen_factory != nullptr) {
if (ingestion_options_.verify_file_checksum == false &&
files_checksums.size() == files_to_ingest_.size() &&
files_checksum_func_names.size() == files_to_ingest_.size()) {
// Only when verify_file_checksum == false and the checksum for ingested
// files are provided, DB will use the provided checksum and does not
// generate the checksum for ingested files.
need_generate_file_checksum_ = false;
} else {
need_generate_file_checksum_ = true;
}
FileChecksumGenContext gen_context;
std::unique_ptr<FileChecksumGenerator> file_checksum_gen =
db_options_.file_checksum_gen_factory->CreateFileChecksumGenerator(
gen_context);
std::vector<std::string> generated_checksums;
std::vector<std::string> generated_checksum_func_names;
// Step 1: generate the checksum for ingested sst file.
if (need_generate_file_checksum_) {
for (size_t i = 0; i < files_to_ingest_.size(); i++) {
std::string generated_checksum;
std::string generated_checksum_func_name;
std::string requested_checksum_func_name;
Add rate limiter priority to ReadOptions (#9424) Summary: Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working. `RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`. There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads). The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424 Test Plan: - new unit tests - new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart. - setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true` - benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true` - crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10` Reviewed By: hx235 Differential Revision: D33747386 Pulled By: ajkr fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c
3 years ago
// TODO: rate limit file reads for checksum calculation during file
// ingestion.
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
IOStatus io_s = GenerateOneFileChecksum(
fs_.get(), files_to_ingest_[i].internal_file_path,
db_options_.file_checksum_gen_factory.get(),
requested_checksum_func_name, &generated_checksum,
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
&generated_checksum_func_name,
ingestion_options_.verify_checksums_readahead_size,
db_options_.allow_mmap_reads, io_tracer_,
Add rate limiter priority to ReadOptions (#9424) Summary: Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working. `RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`. There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads). The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424 Test Plan: - new unit tests - new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart. - setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true` - benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true` - crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10` Reviewed By: hx235 Differential Revision: D33747386 Pulled By: ajkr fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c
3 years ago
db_options_.rate_limiter.get(),
Env::IO_TOTAL /* rate_limiter_priority */);
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
if (!io_s.ok()) {
status = io_s;
ROCKS_LOG_WARN(db_options_.info_log,
"Sst file checksum generation of file: %s failed: %s",
files_to_ingest_[i].internal_file_path.c_str(),
status.ToString().c_str());
break;
}
if (ingestion_options_.write_global_seqno == false) {
files_to_ingest_[i].file_checksum = generated_checksum;
files_to_ingest_[i].file_checksum_func_name =
generated_checksum_func_name;
}
generated_checksums.push_back(generated_checksum);
generated_checksum_func_names.push_back(generated_checksum_func_name);
}
}
// Step 2: based on the verify_file_checksum and ingested checksum
// information, do the verification.
if (status.ok()) {
if (files_checksums.size() == files_to_ingest_.size() &&
files_checksum_func_names.size() == files_to_ingest_.size()) {
// Verify the checksum and checksum function name.
if (ingestion_options_.verify_file_checksum) {
for (size_t i = 0; i < files_to_ingest_.size(); i++) {
if (files_checksum_func_names[i] !=
generated_checksum_func_names[i]) {
status = Status::InvalidArgument(
"Checksum function name does not match with the checksum "
"function name of this DB");
ROCKS_LOG_WARN(
db_options_.info_log,
"Sst file checksum verification of file: %s failed: %s",
external_files_paths[i].c_str(), status.ToString().c_str());
break;
}
if (files_checksums[i] != generated_checksums[i]) {
status = Status::Corruption(
"Ingested checksum does not match with the generated "
"checksum");
ROCKS_LOG_WARN(
db_options_.info_log,
"Sst file checksum verification of file: %s failed: %s",
files_to_ingest_[i].internal_file_path.c_str(),
status.ToString().c_str());
break;
}
}
} else {
// If verify_file_checksum is not enabled, we only verify the
// checksum function name. If it does not match, fail the ingestion.
// If matches, we trust the ingested checksum information and store
// in the Manifest.
for (size_t i = 0; i < files_to_ingest_.size(); i++) {
if (files_checksum_func_names[i] != file_checksum_gen->Name()) {
status = Status::InvalidArgument(
"Checksum function name does not match with the checksum "
"function name of this DB");
ROCKS_LOG_WARN(
db_options_.info_log,
"Sst file checksum verification of file: %s failed: %s",
external_files_paths[i].c_str(), status.ToString().c_str());
break;
}
files_to_ingest_[i].file_checksum = files_checksums[i];
files_to_ingest_[i].file_checksum_func_name =
files_checksum_func_names[i];
}
}
} else if (files_checksums.size() != files_checksum_func_names.size() ||
(files_checksums.size() == files_checksum_func_names.size() &&
files_checksums.size() != 0)) {
// The checksum or checksum function name vector are not both empty
// and they are incomplete.
status = Status::InvalidArgument(
"The checksum information of ingested sst files are nonempty and "
"the size of checksums or the size of the checksum function "
"names "
"does not match with the number of ingested sst files");
ROCKS_LOG_WARN(
db_options_.info_log,
"The ingested sst files checksum information is incomplete: %s",
status.ToString().c_str());
}
}
}
// TODO: The following is duplicated with Cleanup().
if (!status.ok()) {
IOOptions io_opts;
// We failed, remove all files that we copied into the db
for (IngestedFileInfo& f : files_to_ingest_) {
if (f.internal_file_path.empty()) {
continue;
}
Status s = fs_->DeleteFile(f.internal_file_path, io_opts, nullptr);
if (!s.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"AddFile() clean up for file %s failed : %s",
f.internal_file_path.c_str(), s.ToString().c_str());
}
}
}
return status;
}
Status ExternalSstFileIngestionJob::NeedsFlush(bool* flush_needed,
SuperVersion* super_version) {
autovector<Range> ranges;
for (const IngestedFileInfo& file_to_ingest : files_to_ingest_) {
ranges.emplace_back(file_to_ingest.smallest_internal_key.user_key(),
file_to_ingest.largest_internal_key.user_key());
}
Status status = cfd_->RangesOverlapWithMemtables(
ranges, super_version, db_options_.allow_data_in_errors, flush_needed);
if (status.ok() && *flush_needed &&
!ingestion_options_.allow_blocking_flush) {
status = Status::InvalidArgument("External file requires flush");
}
return status;
}
Optimize for serial commits in 2PC Summary: Throughput: 46k tps in our sysbench settings (filling the details later) The idea is to have the simplest change that gives us a reasonable boost in 2PC throughput. Major design changes: 1. The WAL file internal buffer is not flushed after each write. Instead it is flushed before critical operations (WAL copy via fs) or when FlushWAL is called by MySQL. Flushing the WAL buffer is also protected via mutex_. 2. Use two sequence numbers: last seq, and last seq for write. Last seq is the last visible sequence number for reads. Last seq for write is the next sequence number that should be used to write to WAL/memtable. This allows to have a memtable write be in parallel to WAL writes. 3. BatchGroup is not used for writes. This means that we can have parallel writers which changes a major assumption in the code base. To accommodate for that i) allow only 1 WriteImpl that intends to write to memtable via mem_mutex_--which is fine since in 2PC almost all of the memtable writes come via group commit phase which is serial anyway, ii) make all the parts in the code base that assumed to be the only writer (via EnterUnbatched) to also acquire mem_mutex_, iii) stat updates are protected via a stat_mutex_. Note: the first commit has the approach figured out but is not clean. Submitting the PR anyway to get the early feedback on the approach. If we are ok with the approach I will go ahead with this updates: 0) Rebase with Yi's pipelining changes 1) Currently batching is disabled by default to make sure that it will be consistent with all unit tests. Will make this optional via a config. 2) A couple of unit tests are disabled. They need to be updated with the serial commit of 2PC taken into account. 3) Replacing BatchGroup with mem_mutex_ got a bit ugly as it requires releasing mutex_ beforehand (the same way EnterUnbatched does). This needs to be cleaned up. Closes https://github.com/facebook/rocksdb/pull/2345 Differential Revision: D5210732 Pulled By: maysamyabandeh fbshipit-source-id: 78653bd95a35cd1e831e555e0e57bdfd695355a4
7 years ago
// REQUIRES: we have become the only writer by entering both write_thread_ and
// nonmem_write_thread_
Status ExternalSstFileIngestionJob::Run() {
Status status;
SuperVersion* super_version = cfd_->GetSuperVersion();
#ifndef NDEBUG
// We should never run the job with a memtable that is overlapping
// with the files we are ingesting
bool need_flush = false;
status = NeedsFlush(&need_flush, super_version);
if (!status.ok()) {
return status;
}
if (need_flush) {
return Status::TryAgain();
}
assert(status.ok() && need_flush == false);
#endif
bool force_global_seqno = false;
if (ingestion_options_.snapshot_consistency && !db_snapshots_->empty()) {
// We need to assign a global sequence number to all the files even
// if the don't overlap with any ranges since we have snapshots
force_global_seqno = true;
}
// It is safe to use this instead of LastAllocatedSequence since we are
Optimize for serial commits in 2PC Summary: Throughput: 46k tps in our sysbench settings (filling the details later) The idea is to have the simplest change that gives us a reasonable boost in 2PC throughput. Major design changes: 1. The WAL file internal buffer is not flushed after each write. Instead it is flushed before critical operations (WAL copy via fs) or when FlushWAL is called by MySQL. Flushing the WAL buffer is also protected via mutex_. 2. Use two sequence numbers: last seq, and last seq for write. Last seq is the last visible sequence number for reads. Last seq for write is the next sequence number that should be used to write to WAL/memtable. This allows to have a memtable write be in parallel to WAL writes. 3. BatchGroup is not used for writes. This means that we can have parallel writers which changes a major assumption in the code base. To accommodate for that i) allow only 1 WriteImpl that intends to write to memtable via mem_mutex_--which is fine since in 2PC almost all of the memtable writes come via group commit phase which is serial anyway, ii) make all the parts in the code base that assumed to be the only writer (via EnterUnbatched) to also acquire mem_mutex_, iii) stat updates are protected via a stat_mutex_. Note: the first commit has the approach figured out but is not clean. Submitting the PR anyway to get the early feedback on the approach. If we are ok with the approach I will go ahead with this updates: 0) Rebase with Yi's pipelining changes 1) Currently batching is disabled by default to make sure that it will be consistent with all unit tests. Will make this optional via a config. 2) A couple of unit tests are disabled. They need to be updated with the serial commit of 2PC taken into account. 3) Replacing BatchGroup with mem_mutex_ got a bit ugly as it requires releasing mutex_ beforehand (the same way EnterUnbatched does). This needs to be cleaned up. Closes https://github.com/facebook/rocksdb/pull/2345 Differential Revision: D5210732 Pulled By: maysamyabandeh fbshipit-source-id: 78653bd95a35cd1e831e555e0e57bdfd695355a4
7 years ago
// the only active writer, and hence they are equal
SequenceNumber last_seqno = versions_->LastSequence();
edit_.SetColumnFamily(cfd_->GetID());
// The levels that the files will be ingested into
for (IngestedFileInfo& f : files_to_ingest_) {
SequenceNumber assigned_seqno = 0;
if (ingestion_options_.ingest_behind) {
status = CheckLevelForIngestedBehindFile(&f);
} else {
status = AssignLevelAndSeqnoForIngestedFile(
super_version, force_global_seqno, cfd_->ioptions()->compaction_style,
last_seqno, &f, &assigned_seqno);
}
// Modify the smallest/largest internal key to include the sequence number
// that we just learned. Only overwrite sequence number zero. There could
// be a nonzero sequence number already to indicate a range tombstone's
// exclusive endpoint.
ParsedInternalKey smallest_parsed, largest_parsed;
if (status.ok()) {
status = ParseInternalKey(*f.smallest_internal_key.rep(),
&smallest_parsed, false /* log_err_key */);
}
if (status.ok()) {
status = ParseInternalKey(*f.largest_internal_key.rep(), &largest_parsed,
false /* log_err_key */);
}
if (!status.ok()) {
return status;
}
if (smallest_parsed.sequence == 0) {
UpdateInternalKey(f.smallest_internal_key.rep(), assigned_seqno,
smallest_parsed.type);
}
if (largest_parsed.sequence == 0) {
UpdateInternalKey(f.largest_internal_key.rep(), assigned_seqno,
largest_parsed.type);
}
status = AssignGlobalSeqnoForIngestedFile(&f, assigned_seqno);
TEST_SYNC_POINT_CALLBACK("ExternalSstFileIngestionJob::Run",
&assigned_seqno);
if (assigned_seqno > last_seqno) {
assert(assigned_seqno == last_seqno + 1);
last_seqno = assigned_seqno;
++consumed_seqno_count_;
}
if (!status.ok()) {
return status;
}
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
status = GenerateChecksumForIngestedFile(&f);
if (!status.ok()) {
return status;
}
// We use the import time as the ancester time. This is the time the data
// is written to the database.
int64_t temp_current_time = 0;
uint64_t current_time = kUnknownFileCreationTime;
uint64_t oldest_ancester_time = kUnknownOldestAncesterTime;
if (clock_->GetCurrentTime(&temp_current_time).ok()) {
current_time = oldest_ancester_time =
static_cast<uint64_t>(temp_current_time);
}
FileMetaData f_metadata(
f.fd.GetNumber(), f.fd.GetPathId(), f.fd.GetFileSize(),
f.smallest_internal_key, f.largest_internal_key, f.assigned_seqno,
f.assigned_seqno, false, f.file_temperature, kInvalidBlobFileNumber,
oldest_ancester_time, current_time, f.file_checksum,
f.file_checksum_func_name, kDisableUserTimestamp,
kDisableUserTimestamp);
f_metadata.temperature = f.file_temperature;
edit_.AddFile(f.picked_level, f_metadata);
}
return status;
}
void ExternalSstFileIngestionJob::UpdateStats() {
// Update internal stats for new ingested files
uint64_t total_keys = 0;
uint64_t total_l0_files = 0;
uint64_t total_time = clock_->NowMicros() - job_start_time_;
EventLoggerStream stream = event_logger_->Log();
stream << "event"
<< "ingest_finished";
stream << "files_ingested";
stream.StartArray();
for (IngestedFileInfo& f : files_to_ingest_) {
InternalStats::CompactionStats stats(CompactionReason::kExternalSstIngestion, 1);
stats.micros = total_time;
// If actual copy occurred for this file, then we need to count the file
// size as the actual bytes written. If the file was linked, then we ignore
// the bytes written for file metadata.
// TODO (yanqin) maybe account for file metadata bytes for exact accuracy?
if (f.copy_file) {
stats.bytes_written = f.fd.GetFileSize();
} else {
stats.bytes_moved = f.fd.GetFileSize();
}
stats.num_output_files = 1;
cfd_->internal_stats()->AddCompactionStats(f.picked_level,
Env::Priority::USER, stats);
cfd_->internal_stats()->AddCFStats(InternalStats::BYTES_INGESTED_ADD_FILE,
f.fd.GetFileSize());
total_keys += f.num_entries;
if (f.picked_level == 0) {
total_l0_files += 1;
}
ROCKS_LOG_INFO(
db_options_.info_log,
"[AddFile] External SST file %s was ingested in L%d with path %s "
"(global_seqno=%" PRIu64 ")\n",
f.external_file_path.c_str(), f.picked_level,
f.internal_file_path.c_str(), f.assigned_seqno);
stream << "file" << f.internal_file_path << "level" << f.picked_level;
}
stream.EndArray();
stream << "lsm_state";
stream.StartArray();
auto vstorage = cfd_->current()->storage_info();
for (int level = 0; level < vstorage->num_levels(); ++level) {
stream << vstorage->NumLevelFiles(level);
}
stream.EndArray();
cfd_->internal_stats()->AddCFStats(InternalStats::INGESTED_NUM_KEYS_TOTAL,
total_keys);
cfd_->internal_stats()->AddCFStats(InternalStats::INGESTED_NUM_FILES_TOTAL,
files_to_ingest_.size());
cfd_->internal_stats()->AddCFStats(
InternalStats::INGESTED_LEVEL0_NUM_FILES_TOTAL, total_l0_files);
}
void ExternalSstFileIngestionJob::Cleanup(const Status& status) {
IOOptions io_opts;
if (!status.ok()) {
// We failed to add the files to the database
// remove all the files we copied
for (IngestedFileInfo& f : files_to_ingest_) {
if (f.internal_file_path.empty()) {
continue;
}
Status s = fs_->DeleteFile(f.internal_file_path, io_opts, nullptr);
if (!s.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"AddFile() clean up for file %s failed : %s",
f.internal_file_path.c_str(), s.ToString().c_str());
}
}
consumed_seqno_count_ = 0;
files_overlap_ = false;
} else if (status.ok() && ingestion_options_.move_files) {
// The files were moved and added successfully, remove original file links
for (IngestedFileInfo& f : files_to_ingest_) {
Status s = fs_->DeleteFile(f.external_file_path, io_opts, nullptr);
if (!s.ok()) {
ROCKS_LOG_WARN(
db_options_.info_log,
"%s was added to DB successfully but failed to remove original "
"file link : %s",
f.external_file_path.c_str(), s.ToString().c_str());
}
}
}
}
Status ExternalSstFileIngestionJob::GetIngestedFileInfo(
New stable, fixed-length cache keys (#9126) Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f
3 years ago
const std::string& external_file, uint64_t new_file_number,
IngestedFileInfo* file_to_ingest, SuperVersion* sv) {
file_to_ingest->external_file_path = external_file;
// Get external file size
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
Status status = fs_->GetFileSize(external_file, IOOptions(),
&file_to_ingest->file_size, nullptr);
if (!status.ok()) {
return status;
}
New stable, fixed-length cache keys (#9126) Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f
3 years ago
// Assign FD with number
file_to_ingest->fd =
FileDescriptor(new_file_number, 0, file_to_ingest->file_size);
// Create TableReader for external file
std::unique_ptr<TableReader> table_reader;
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
std::unique_ptr<FSRandomAccessFile> sst_file;
std::unique_ptr<RandomAccessFileReader> sst_file_reader;
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
status = fs_->NewRandomAccessFile(external_file, env_options_,
&sst_file, nullptr);
if (!status.ok()) {
return status;
}
sst_file_reader.reset(new RandomAccessFileReader(
std::move(sst_file), external_file, nullptr /*Env*/, io_tracer_));
status = cfd_->ioptions()->table_factory->NewTableReader(
New stable, fixed-length cache keys (#9126) Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f
3 years ago
TableReaderOptions(
Fast path for detecting unchanged prefix_extractor (#9407) Summary: Fixes a major performance regression in 6.26, where extra CPU is spent in SliceTransform::AsString when reads involve a prefix_extractor (Get, MultiGet, Seek). Common case performance is now better than 6.25. This change creates a "fast path" for verifying that the current prefix extractor is unchanged and compatible with what was used to generate a table file. This fast path detects the common case by pointer comparison on the current prefix_extractor and a "known good" prefix extractor (if applicable) that is saved at the time the table reader is opened. The "known good" prefix extractor is saved as another shared_ptr copy (in an existing field, however) to ensure the pointer is not recycled. When the prefix_extractor has changed to a different instance but same compatible configuration (rare, odd), performance is still a regression compared to 6.25, but this is likely acceptable because of the oddity of such a case. The performance of incompatible prefix_extractor is essentially unchanged. Also fixed a minor case (ForwardIterator) where a prefix_extractor could be used via a raw pointer after being freed as a shared_ptr, if replaced via SetOptions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9407 Test Plan: ## Performance Populate DB with `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom -num=10000000 -disable_wal=1 -write_buffer_size=10000000 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -prefix_size=12` Running head-to-head comparisons simultaneously with `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -use_existing_db -readonly -benchmarks=seekrandom -num=10000000 -duration=20 -disable_wal=1 -bloom_bits=16 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -prefix_size=12` Below each is compared by ops/sec vs. baseline which is version 6.25 (multiple baseline runs because of variable machine load) v6.26: 4833 vs. 6698 (<- major regression!) v6.27: 4737 vs. 6397 (still) New: 6704 vs. 6461 (better than baseline in common case) Disabled fastpath: 4843 vs. 6389 (e.g. if prefix extractor instance changes but is still compatible) Changed prefix size (no usable filter) in new: 787 vs. 5927 Changed prefix size (no usable filter) in new & baseline: 773 vs. 784 Reviewed By: mrambacher Differential Revision: D33677812 Pulled By: pdillinger fbshipit-source-id: 571d9711c461fb97f957378a061b7e7dbc4d6a76
3 years ago
*cfd_->ioptions(), sv->mutable_cf_options.prefix_extractor,
New stable, fixed-length cache keys (#9126) Summary: This change standardizes on a new 16-byte cache key format for block cache (incl compressed and secondary) and persistent cache (but not table cache and row cache). The goal is a really fast cache key with practically ideal stability and uniqueness properties without external dependencies (e.g. from FileSystem). A fixed key size of 16 bytes should enable future optimizations to the concurrent hash table for block cache, which is a heavy CPU user / bottleneck, but there appears to be measurable performance improvement even with no changes to LRUCache. This change replaces a lot of disjointed and ugly code handling cache keys with calls to a simple, clean new internal API (cache_key.h). (Preserving the old cache key logic under an option would be very ugly and likely negate the performance gain of the new approach. Complete replacement carries some inherent risk, but I think that's acceptable with sufficient analysis and testing.) The scheme for encoding new cache keys is complicated but explained in cache_key.cc. Also: EndianSwapValue is moved to math.h to be next to other bit operations. (Explains some new include "math.h".) ReverseBits operation added and unit tests added to hash_test for both. Fixes https://github.com/facebook/rocksdb/issues/7405 (presuming a root cause) Pull Request resolved: https://github.com/facebook/rocksdb/pull/9126 Test Plan: ### Basic correctness Several tests needed updates to work with the new functionality, mostly because we are no longer relying on filesystem for stable cache keys so table builders & readers need more context info to agree on cache keys. This functionality is so core, a huge number of existing tests exercise the cache key functionality. ### Performance Create db with `TEST_TMPDIR=/dev/shm ./db_bench -bloom_bits=10 -benchmarks=fillrandom -num=3000000 -partition_index_and_filters` And test performance with `TEST_TMPDIR=/dev/shm ./db_bench -readonly -use_existing_db -bloom_bits=10 -benchmarks=readrandom -num=3000000 -duration=30 -cache_index_and_filter_blocks -cache_size=250000 -threads=4` using DEBUG_LEVEL=0 and simultaneous before & after runs. Before ops/sec, avg over 100 runs: 121924 After ops/sec, avg over 100 runs: 125385 (+2.8%) ### Collision probability I have built a tool, ./cache_bench -stress_cache_key to broadly simulate host-wide cache activity over many months, by making some pessimistic simplifying assumptions: * Every generated file has a cache entry for every byte offset in the file (contiguous range of cache keys) * All of every file is cached for its entire lifetime We use a simple table with skewed address assignment and replacement on address collision to simulate files coming & going, with quite a variance (super-Poisson) in ages. Some output with `./cache_bench -stress_cache_key -sck_keep_bits=40`: ``` Total cache or DBs size: 32TiB Writing 925.926 MiB/s or 76.2939TiB/day Multiply by 9.22337e+18 to correct for simulation losses (but still assume whole file cached) ``` These come from default settings of 2.5M files per day of 32 MB each, and `-sck_keep_bits=40` means that to represent a single file, we are only keeping 40 bits of the 128-bit cache key. With file size of 2\*\*25 contiguous keys (pessimistic), our simulation is about 2\*\*(128-40-25) or about 9 billion billion times more prone to collision than reality. More default assumptions, relatively pessimistic: * 100 DBs in same process (doesn't matter much) * Re-open DB in same process (new session ID related to old session ID) on average every 100 files generated * Restart process (all new session IDs unrelated to old) 24 times per day After enough data, we get a result at the end: ``` (keep 40 bits) 17 collisions after 2 x 90 days, est 10.5882 days between (9.76592e+19 corrected) ``` If we believe the (pessimistic) simulation and the mathematical generalization, we would need to run a billion machines all for 97 billion days to expect a cache key collision. To help verify that our generalization ("corrected") is robust, we can make our simulation more precise with `-sck_keep_bits=41` and `42`, which takes more running time to get enough data: ``` (keep 41 bits) 16 collisions after 4 x 90 days, est 22.5 days between (1.03763e+20 corrected) (keep 42 bits) 19 collisions after 10 x 90 days, est 47.3684 days between (1.09224e+20 corrected) ``` The generalized prediction still holds. With the `-sck_randomize` option, we can see that we are beating "random" cache keys (except offsets still non-randomized) by a modest amount (roughly 20x less collision prone than random), which should make us reasonably comfortable even in "degenerate" cases: ``` 197 collisions after 1 x 90 days, est 0.456853 days between (4.21372e+18 corrected) ``` I've run other tests to validate other conditions behave as expected, never behaving "worse than random" unless we start chopping off structured data. Reviewed By: zhichao-cao Differential Revision: D33171746 Pulled By: pdillinger fbshipit-source-id: f16a57e369ed37be5e7e33525ace848d0537c88f
3 years ago
env_options_, cfd_->internal_comparator(),
/*skip_filters*/ false, /*immortal*/ false,
/*force_direct_prefetch*/ false, /*level*/ -1,
/*block_cache_tracer*/ nullptr,
/*max_file_size_for_l0_meta_pin*/ 0, versions_->DbSessionId(),
/*cur_file_num*/ new_file_number),
std::move(sst_file_reader), file_to_ingest->file_size, &table_reader);
if (!status.ok()) {
return status;
}
if (ingestion_options_.verify_checksums_before_ingest) {
// If customized readahead size is needed, we can pass a user option
// all the way to here. Right now we just rely on the default readahead
// to keep things simple.
ReadOptions ro;
ro.readahead_size = ingestion_options_.verify_checksums_readahead_size;
status = table_reader->VerifyChecksum(
ro, TableReaderCaller::kExternalSSTIngestion);
}
if (!status.ok()) {
return status;
}
// Get the external file properties
auto props = table_reader->GetTableProperties();
const auto& uprops = props->user_collected_properties;
// Get table version
auto version_iter = uprops.find(ExternalSstFilePropertyNames::kVersion);
if (version_iter == uprops.end()) {
return Status::Corruption("External file version not found");
}
file_to_ingest->version = DecodeFixed32(version_iter->second.c_str());
auto seqno_iter = uprops.find(ExternalSstFilePropertyNames::kGlobalSeqno);
if (file_to_ingest->version == 2) {
// version 2 imply that we have global sequence number
if (seqno_iter == uprops.end()) {
return Status::Corruption(
"External file global sequence number not found");
}
// Set the global sequence number
file_to_ingest->original_seqno = DecodeFixed64(seqno_iter->second.c_str());
if (props->external_sst_file_global_seqno_offset == 0) {
file_to_ingest->global_seqno_offset = 0;
return Status::Corruption("Was not able to find file global seqno field");
}
file_to_ingest->global_seqno_offset =
static_cast<size_t>(props->external_sst_file_global_seqno_offset);
} else if (file_to_ingest->version == 1) {
// SST file V1 should not have global seqno field
assert(seqno_iter == uprops.end());
file_to_ingest->original_seqno = 0;
if (ingestion_options_.allow_blocking_flush ||
ingestion_options_.allow_global_seqno) {
return Status::InvalidArgument(
"External SST file V1 does not support global seqno");
}
} else {
return Status::InvalidArgument("External file version is not supported");
}
// Get number of entries in table
file_to_ingest->num_entries = props->num_entries;
file_to_ingest->num_range_deletions = props->num_range_deletions;
ParsedInternalKey key;
ReadOptions ro;
// During reading the external file we can cache blocks that we read into
// the block cache, if we later change the global seqno of this file, we will
// have block in cache that will include keys with wrong seqno.
// We need to disable fill_cache so that we read from the file without
// updating the block cache.
ro.fill_cache = false;
std::unique_ptr<InternalIterator> iter(table_reader->NewIterator(
ro, sv->mutable_cf_options.prefix_extractor.get(), /*arena=*/nullptr,
/*skip_filters=*/false, TableReaderCaller::kExternalSSTIngestion));
std::unique_ptr<InternalIterator> range_del_iter(
table_reader->NewRangeTombstoneIterator(ro));
// Get first (smallest) and last (largest) key from file.
file_to_ingest->smallest_internal_key =
InternalKey("", 0, ValueType::kTypeValue);
file_to_ingest->largest_internal_key =
InternalKey("", 0, ValueType::kTypeValue);
bool bounds_set = false;
bool allow_data_in_errors = db_options_.allow_data_in_errors;
iter->SeekToFirst();
if (iter->Valid()) {
Status pik_status =
ParseInternalKey(iter->key(), &key, allow_data_in_errors);
if (!pik_status.ok()) {
return Status::Corruption("Corrupted key in external file. ",
pik_status.getState());
}
if (key.sequence != 0) {
return Status::Corruption("External file has non zero sequence number");
}
file_to_ingest->smallest_internal_key.SetFrom(key);
iter->SeekToLast();
pik_status = ParseInternalKey(iter->key(), &key, allow_data_in_errors);
if (!pik_status.ok()) {
return Status::Corruption("Corrupted key in external file. ",
pik_status.getState());
}
if (key.sequence != 0) {
return Status::Corruption("External file has non zero sequence number");
}
file_to_ingest->largest_internal_key.SetFrom(key);
bounds_set = true;
}
// We may need to adjust these key bounds, depending on whether any range
// deletion tombstones extend past them.
const Comparator* ucmp = cfd_->internal_comparator().user_comparator();
if (range_del_iter != nullptr) {
for (range_del_iter->SeekToFirst(); range_del_iter->Valid();
range_del_iter->Next()) {
Status pik_status =
ParseInternalKey(range_del_iter->key(), &key, allow_data_in_errors);
if (!pik_status.ok()) {
return Status::Corruption("Corrupted key in external file. ",
pik_status.getState());
}
RangeTombstone tombstone(key, range_del_iter->value());
InternalKey start_key = tombstone.SerializeKey();
if (!bounds_set ||
sstableKeyCompare(ucmp, start_key,
file_to_ingest->smallest_internal_key) < 0) {
file_to_ingest->smallest_internal_key = start_key;
}
InternalKey end_key = tombstone.SerializeEndKey();
if (!bounds_set ||
sstableKeyCompare(ucmp, end_key,
file_to_ingest->largest_internal_key) > 0) {
file_to_ingest->largest_internal_key = end_key;
}
bounds_set = true;
}
}
file_to_ingest->cf_id = static_cast<uint32_t>(props->column_family_id);
file_to_ingest->table_properties = *props;
return status;
}
Status ExternalSstFileIngestionJob::AssignLevelAndSeqnoForIngestedFile(
SuperVersion* sv, bool force_global_seqno, CompactionStyle compaction_style,
SequenceNumber last_seqno, IngestedFileInfo* file_to_ingest,
SequenceNumber* assigned_seqno) {
Status status;
*assigned_seqno = 0;
if (force_global_seqno) {
*assigned_seqno = last_seqno + 1;
if (compaction_style == kCompactionStyleUniversal || files_overlap_) {
if (ingestion_options_.fail_if_not_bottommost_level) {
status = Status::TryAgain(
"Files cannot be ingested to Lmax. Please make sure key range of "
"Lmax does not overlap with files to ingest.");
return status;
}
file_to_ingest->picked_level = 0;
return status;
}
}
bool overlap_with_db = false;
Arena arena;
ReadOptions ro;
ro.total_order_seek = true;
int target_level = 0;
auto* vstorage = cfd_->current()->storage_info();
for (int lvl = 0; lvl < cfd_->NumberLevels(); lvl++) {
if (lvl > 0 && lvl < vstorage->base_level()) {
continue;
}
if (vstorage->NumLevelFiles(lvl) > 0) {
bool overlap_with_level = false;
status = sv->current->OverlapWithLevelIterator(
ro, env_options_, file_to_ingest->smallest_internal_key.user_key(),
file_to_ingest->largest_internal_key.user_key(), lvl,
&overlap_with_level);
if (!status.ok()) {
return status;
}
if (overlap_with_level) {
// We must use L0 or any level higher than `lvl` to be able to overwrite
// the keys that we overlap with in this level, We also need to assign
// this file a seqno to overwrite the existing keys in level `lvl`
overlap_with_db = true;
break;
}
if (compaction_style == kCompactionStyleUniversal && lvl != 0) {
const std::vector<FileMetaData*>& level_files =
vstorage->LevelFiles(lvl);
const SequenceNumber level_largest_seqno =
(*std::max_element(level_files.begin(), level_files.end(),
[](FileMetaData* f1, FileMetaData* f2) {
return f1->fd.largest_seqno <
f2->fd.largest_seqno;
}))
->fd.largest_seqno;
// should only assign seqno to current level's largest seqno when
// the file fits
if (level_largest_seqno != 0 &&
IngestedFileFitInLevel(file_to_ingest, lvl)) {
*assigned_seqno = level_largest_seqno;
} else {
continue;
}
}
} else if (compaction_style == kCompactionStyleUniversal) {
continue;
}
// We don't overlap with any keys in this level, but we still need to check
// if our file can fit in it
if (IngestedFileFitInLevel(file_to_ingest, lvl)) {
target_level = lvl;
}
}
// If files overlap, we have to ingest them at level 0 and assign the newest
// sequence number
if (files_overlap_) {
target_level = 0;
*assigned_seqno = last_seqno + 1;
}
if (ingestion_options_.fail_if_not_bottommost_level &&
target_level < cfd_->NumberLevels() - 1) {
status = Status::TryAgain(
"Files cannot be ingested to Lmax. Please make sure key range of Lmax "
"does not overlap with files to ingest.");
return status;
}
TEST_SYNC_POINT_CALLBACK(
"ExternalSstFileIngestionJob::AssignLevelAndSeqnoForIngestedFile",
&overlap_with_db);
file_to_ingest->picked_level = target_level;
if (overlap_with_db && *assigned_seqno == 0) {
*assigned_seqno = last_seqno + 1;
}
return status;
}
Status ExternalSstFileIngestionJob::CheckLevelForIngestedBehindFile(
IngestedFileInfo* file_to_ingest) {
auto* vstorage = cfd_->current()->storage_info();
// first check if new files fit in the bottommost level
int bottom_lvl = cfd_->NumberLevels() - 1;
if(!IngestedFileFitInLevel(file_to_ingest, bottom_lvl)) {
return Status::InvalidArgument(
"Can't ingest_behind file as it doesn't fit "
"at the bottommost level!");
}
// second check if despite allow_ingest_behind=true we still have 0 seqnums
// at some upper level
for (int lvl = 0; lvl < cfd_->NumberLevels() - 1; lvl++) {
for (auto file : vstorage->LevelFiles(lvl)) {
if (file->fd.smallest_seqno == 0) {
return Status::InvalidArgument(
"Can't ingest_behind file as despite allow_ingest_behind=true "
"there are files with 0 seqno in database at upper levels!");
}
}
}
file_to_ingest->picked_level = bottom_lvl;
return Status::OK();
}
Status ExternalSstFileIngestionJob::AssignGlobalSeqnoForIngestedFile(
IngestedFileInfo* file_to_ingest, SequenceNumber seqno) {
if (file_to_ingest->original_seqno == seqno) {
// This file already have the correct global seqno
return Status::OK();
} else if (!ingestion_options_.allow_global_seqno) {
return Status::InvalidArgument("Global seqno is required, but disabled");
} else if (file_to_ingest->global_seqno_offset == 0) {
return Status::InvalidArgument(
"Trying to set global seqno for a file that don't have a global seqno "
"field");
}
if (ingestion_options_.write_global_seqno) {
// Determine if we can write global_seqno to a given offset of file.
// If the file system does not support random write, then we should not.
// Otherwise we should.
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
std::unique_ptr<FSRandomRWFile> rwfile;
Status status =
fs_->NewRandomRWFile(file_to_ingest->internal_file_path, env_options_,
&rwfile, nullptr);
TEST_SYNC_POINT_CALLBACK("ExternalSstFileIngestionJob::NewRandomRWFile",
&status);
if (status.ok()) {
FSRandomRWFilePtr fsptr(std::move(rwfile), io_tracer_,
file_to_ingest->internal_file_path);
std::string seqno_val;
PutFixed64(&seqno_val, seqno);
status = fsptr->Write(file_to_ingest->global_seqno_offset, seqno_val,
IOOptions(), nullptr);
if (status.ok()) {
TEST_SYNC_POINT("ExternalSstFileIngestionJob::BeforeSyncGlobalSeqno");
status = SyncIngestedFile(fsptr.get());
TEST_SYNC_POINT("ExternalSstFileIngestionJob::AfterSyncGlobalSeqno");
if (!status.ok()) {
ROCKS_LOG_WARN(db_options_.info_log,
"Failed to sync ingested file %s after writing global "
"sequence number: %s",
file_to_ingest->internal_file_path.c_str(),
status.ToString().c_str());
}
}
if (!status.ok()) {
return status;
}
} else if (!status.IsNotSupported()) {
return status;
}
}
file_to_ingest->assigned_seqno = seqno;
return Status::OK();
}
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
IOStatus ExternalSstFileIngestionJob::GenerateChecksumForIngestedFile(
IngestedFileInfo* file_to_ingest) {
if (db_options_.file_checksum_gen_factory == nullptr ||
need_generate_file_checksum_ == false ||
ingestion_options_.write_global_seqno == false) {
// If file_checksum_gen_factory is not set, we are not able to generate
// the checksum. if write_global_seqno is false, it means we will use
// file checksum generated during Prepare(). This step will be skipped.
return IOStatus::OK();
}
std::string file_checksum;
std::string file_checksum_func_name;
std::string requested_checksum_func_name;
Add rate limiter priority to ReadOptions (#9424) Summary: Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working. `RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`. There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads). The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424 Test Plan: - new unit tests - new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart. - setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true` - benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true` - crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10` Reviewed By: hx235 Differential Revision: D33747386 Pulled By: ajkr fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c
3 years ago
// TODO: rate limit file reads for checksum calculation during file ingestion.
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
IOStatus io_s = GenerateOneFileChecksum(
fs_.get(), file_to_ingest->internal_file_path,
db_options_.file_checksum_gen_factory.get(), requested_checksum_func_name,
&file_checksum, &file_checksum_func_name,
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
ingestion_options_.verify_checksums_readahead_size,
Add rate limiter priority to ReadOptions (#9424) Summary: Users can set the priority for file reads associated with their operation by setting `ReadOptions::rate_limiter_priority` to something other than `Env::IO_TOTAL`. Rate limiting `VerifyChecksum()` and `VerifyFileChecksums()` is the motivation for this PR, so it also includes benchmarks and minor bug fixes to get that working. `RandomAccessFileReader::Read()` already had support for rate limiting compaction reads. I changed that rate limiting to be non-specific to compaction, but rather performed according to the passed in `Env::IOPriority`. Now the compaction read rate limiting is supported by setting `rate_limiter_priority = Env::IO_LOW` on its `ReadOptions`. There is no default value for the new `Env::IOPriority` parameter to `RandomAccessFileReader::Read()`. That means this PR goes through all callers (in some cases multiple layers up the call stack) to find a `ReadOptions` to provide the priority. There are TODOs for cases I believe it would be good to let user control the priority some day (e.g., file footer reads), and no TODO in cases I believe it doesn't matter (e.g., trace file reads). The API doc only lists the missing cases where a file read associated with a provided `ReadOptions` cannot be rate limited. For cases like file ingestion checksum calculation, there is no API to provide `ReadOptions` or `Env::IOPriority`, so I didn't count that as missing. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9424 Test Plan: - new unit tests - new benchmarks on ~50MB database with 1MB/s read rate limit and 100ms refill interval; verified with strace reads are chunked (at 0.1MB per chunk) and spaced roughly 100ms apart. - setup command: `./db_bench -benchmarks=fillrandom,compact -db=/tmp/testdb -target_file_size_base=1048576 -disable_auto_compactions=true -file_checksum=true` - benchmarks command: `strace -ttfe pread64 ./db_bench -benchmarks=verifychecksum,verifyfilechecksums -use_existing_db=true -db=/tmp/testdb -rate_limiter_bytes_per_sec=1048576 -rate_limit_bg_reads=1 -rate_limit_user_ops=true -file_checksum=true` - crash test using IO_USER priority on non-validation reads with https://github.com/facebook/rocksdb/issues/9567 reverted: `python3 tools/db_crashtest.py blackbox --max_key=1000000 --write_buffer_size=524288 --target_file_size_base=524288 --level_compaction_dynamic_level_bytes=true --duration=3600 --rate_limit_bg_reads=true --rate_limit_user_ops=true --rate_limiter_bytes_per_sec=10485760 --interval=10` Reviewed By: hx235 Differential Revision: D33747386 Pulled By: ajkr fbshipit-source-id: a2d985e97912fba8c54763798e04f006ccc56e0c
3 years ago
db_options_.allow_mmap_reads, io_tracer_, db_options_.rate_limiter.get(),
Env::IO_TOTAL /* rate_limiter_priority */);
Ingest SST files with checksum information (#6891) Summary: Application can ingest SST files with file checksum information, such that during ingestion, DB is able to check data integrity and identify of the SST file. The PR introduces generate_and_verify_file_checksum to IngestExternalFileOption to control if the ingested checksum information should be verified with the generated checksum. 1. If generate_and_verify_file_checksum options is *FALSE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enables the SST file checksum and the checksum function name matches the checksum function name in DB, we trust the ingested checksum, store it in Manifest. If the checksum function name does not match, we treat that as an error and fail the IngestExternalFile() call. 2. If generate_and_verify_file_checksum options is *TRUE*: *1)* if DB does not enable SST file checksum, the checksum information ingested will be ignored; *2)* if DB enable the SST file checksum, we will use the checksum generator from DB to calculate the checksum for each ingested SST files after they are copied or moved. Then, compare the checksum results with the ingested checksum information: _A)_ if the checksum function name does not match, _verification always report true_ and we store the DB generated checksum information in Manifest. _B)_ if the checksum function name mach, and checksum match, ingestion continues and stores the checksum information in the Manifest. Otherwise, terminate file ingestion and report file corruption. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6891 Test Plan: added unit test, pass make asan_check Reviewed By: pdillinger Differential Revision: D21935988 Pulled By: zhichao-cao fbshipit-source-id: 7b55f486632db467e76d72602218d0658aa7f6ed
4 years ago
if (!io_s.ok()) {
return io_s;
}
file_to_ingest->file_checksum = file_checksum;
file_to_ingest->file_checksum_func_name = file_checksum_func_name;
return IOStatus::OK();
}
bool ExternalSstFileIngestionJob::IngestedFileFitInLevel(
const IngestedFileInfo* file_to_ingest, int level) {
if (level == 0) {
// Files can always fit in L0
return true;
}
auto* vstorage = cfd_->current()->storage_info();
Slice file_smallest_user_key(
file_to_ingest->smallest_internal_key.user_key());
Slice file_largest_user_key(file_to_ingest->largest_internal_key.user_key());
if (vstorage->OverlapInLevel(level, &file_smallest_user_key,
&file_largest_user_key)) {
// File overlap with another files in this level, we cannot
// add it to this level
return false;
}
if (cfd_->RangeOverlapWithCompaction(file_smallest_user_key,
file_largest_user_key, level)) {
// File overlap with a running compaction output that will be stored
// in this level, we cannot add this file to this level
return false;
}
// File did not overlap with level files, our compaction output
return true;
}
template <typename TWritableFile>
Status ExternalSstFileIngestionJob::SyncIngestedFile(TWritableFile* file) {
assert(file != nullptr);
if (db_options_.use_fsync) {
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
return file->Fsync(IOOptions(), nullptr);
} else {
Introduce a new storage specific Env API (#5761) Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
5 years ago
return file->Sync(IOOptions(), nullptr);
}
}
} // namespace ROCKSDB_NAMESPACE
#endif // !ROCKSDB_LITE