Summary:
db_bench can now run with FastLRUCache.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10096
Test Plan:
- Temporarily add an ``assert(false)`` in the execution path that sets up the FastLRUCache. Run ``make -j24 db_bench``. Then test the appropriate code is used by running ``./db_bench -cache_type=fast_lru_cache`` and checking that the assert is called. Repeat for LRUCache.
- Verify that FastLRUCache (currently a clone of LRUCache) produces similar benchmark data than LRUCache, by comparing the outputs of ``./db_bench -benchmarks=fillseq,fillrandom,readseq,readrandom -cache_type=fast_lru_cache`` and ``./db_bench -benchmarks=fillseq,fillrandom,readseq,readrandom -cache_type=lru_cache``.
Reviewed By: gitbw95
Differential Revision: D36898774
Pulled By: guidotag
fbshipit-source-id: f9f6b6f6da124f88b21b3c8dee742fbb04eff773
Summary:
In [close_db_dir](https://github.com/facebook/rocksdb/pull/10049) pull request, some merging conflicts occurred (some comments and one line `s.PermitUncheckedError()` are missing). This pull request aims to put them back.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10093
Reviewed By: ajkr
Differential Revision: D36884117
Pulled By: littlepig2013
fbshipit-source-id: 8c0e2a8793fc52804067c511843bd1ff4912c1c3
Summary:
Currently, if blob files are enabled (i.e. `enable_blob_files` is true), large values are extracted both during flush/recovery (when SST files are written into level 0 of the LSM tree) and during compaction into any LSM tree level. For certain use cases that have a mix of short-lived and long-lived values, it might make sense to support extracting large values only during compactions whose output level is greater than or equal to a specified LSM tree level (e.g. compactions into L1/L2/... or above). This could reduce the space amplification caused by large values that are turned into garbage shortly after being written at the price of some write amplification incurred by long-lived values whose extraction to blob files is delayed.
In order to achieve this, we would like to do the following:
- Add a new configuration option `blob_file_starting_level` (default: 0) to `AdvancedColumnFamilyOptions` (and `MutableCFOptions` and extend the related logic)
- Instantiate `BlobFileBuilder` in `BuildTable` (used during flush and recovery, where the LSM tree level is L0) and `CompactionJob` iff `enable_blob_files` is set and the LSM tree level is `>= blob_file_starting_level`
- Add unit tests for the new functionality, and add the new option to our stress tests (`db_stress` and `db_crashtest.py` )
- Add the new option to our benchmarking tool `db_bench` and the BlobDB benchmark script `run_blob_bench.sh`
- Add the new option to the `ldb` tool (see https://github.com/facebook/rocksdb/wiki/Administration-and-Data-Access-Tool)
- Ideally extend the C and Java bindings with the new option
- Update the BlobDB wiki to document the new option.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10077
Reviewed By: ltamasi
Differential Revision: D36884156
Pulled By: gangliao
fbshipit-source-id: 942bab025f04633edca8564ed64791cb5e31627d
Summary:
Only used as temperature high bound for current code, may
increase with more temperatures added.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10044
Test Plan: ci
Reviewed By: siying
Differential Revision: D36633410
Pulled By: jay-zhuang
fbshipit-source-id: eecdfa7623c31778c31d789902eacf78aad7b482
Summary:
Garbage collection is generally controlled by the BlobDB configuration options `enable_blob_garbage_collection` and `blob_garbage_collection_age_cutoff`. However, there might be use cases where we would want to temporarily override these options while performing a manual compaction. (One use case would be doing a full key-space manual compaction with full=100% garbage collection age cutoff in order to minimize the space occupied by the database.) Our goal here is to make it possible to override the configured GC parameters when using the `CompactRange` API to perform manual compactions. This PR would involve:
- Extending the `CompactRangeOptions` structure so clients can both force-enable and force-disable GC, as well as use a different cutoff than what's currently configured
- Storing whether blob GC should actually be enabled during a certain manual compaction and the cutoff to use in the `Compaction` object (considering the above overrides) and passing it to `CompactionIterator` via `CompactionProxy`
- Updating the BlobDB wiki to document the new options.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10073
Test Plan: Adding unit tests and adding the new options to the stress test tool.
Reviewed By: ltamasi
Differential Revision: D36848700
Pulled By: gangliao
fbshipit-source-id: c878ef101d1c612429999f513453c319f75d78e9
Summary:
Currently, the DB directory file descriptor is left open until the deconstruction process (`DB::Close()` does not close the file descriptor). To verify this, comment out the lines between `db_ = nullptr` and `db_->Close()` (line 512, 513, 514, 515 in ldb_cmd.cc) to leak the ``db_'' object, build `ldb` tool and run
```
strace --trace=open,openat,close ./ldb --db=$TEST_TMPDIR --ignore_unknown_options put K1 V1 --create_if_missing
```
There is one directory file descriptor that is not closed in the strace log.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10049
Test Plan: Add a new unit test DBBasicTest.DBCloseAllDirectoryFDs: Open a database with different WAL directory and three different data directories, and all directory file descriptors should be closed after calling Close(). Explicitly call Close() after a directory file descriptor is not used so that the counter of directory open and close should be equivalent.
Reviewed By: ajkr, hx235
Differential Revision: D36722135
Pulled By: littlepig2013
fbshipit-source-id: 07bdc2abc417c6b30997b9bbef1f79aa757b21ff
Summary:
Stress tests can run with the experimental FastLRUCache. Crash tests randomly choose between LRUCache and FastLRUCache.
Since only LRUCache supports a secondary cache, we validate the `--secondary_cache_uri` and `--cache_type` flags---when `--secondary_cache_uri` is set, the `--cache_type` is set to `lru_cache`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10081
Test Plan:
- To test that the FastLRUCache is used and the stress test runs successfully, run `make -j24 CRASH_TEST_EXT_ARGS=—duration=960 blackbox_crash_test_with_atomic_flush`. The cache type should sometimes be `fast_lru_cache`.
- To test the flag validation, run `make -j24 CRASH_TEST_EXT_ARGS="--duration=960 --secondary_cache_uri=x" blackbox_crash_test_with_atomic_flush` multiple times. The test will always be aborted (which is okay). Check that the cache type is always `lru_cache`.
Reviewed By: anand1976
Differential Revision: D36839908
Pulled By: guidotag
fbshipit-source-id: ebcdfdcd12ec04c96c09ae5b9c9d1e613bdd1725
Summary:
`db_impl.alive_log_files_` is used to track the WAL size in `db_impl.logs_`.
Get the `LogFileNumberSize` obj in `alive_log_files_` the same time as `log_writer` to keep them consistent.
For this issue, it's not safe to do `deque::reverse_iterator::operator*` and `deque::pop_front()` concurrently,
so remove the tail cache.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10086
Test Plan:
```
# on Windows
gtest-parallel ./db_test --gtest_filter=DBTest.FileCreationRandomFailure -r 1000 -w 100
```
Reviewed By: riversand963
Differential Revision: D36822373
Pulled By: jay-zhuang
fbshipit-source-id: 5e738051dfc7bcf6a15d85ba25e6365df6b6a6af
Summary:
We recently saw a case in crash test in which a WAL file in the
middle of the list of live WALs was not included in the backup, so the
DB was not openable due to missing WAL. We are not sure why, but this
change should at least turn that into a backup-time failure by ensuring
all the WAL files expected by the manifest (according to VersionSet) are
included in `GetSortedWalFiles()` (used by `GetLiveFilesStorageInfo()`,
`BackupEngine`, and `Checkpoint`)
Related: to maximize the effectiveness of
track_and_verify_wals_in_manifest with GetSortedWalFiles() during
checkpoint/backup, we will now sync WAL in GetLiveFilesStorageInfo()
when track_and_verify_wals_in_manifest=true.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10083
Test Plan: added new unit test for the check in GetSortedWalFiles()
Reviewed By: ajkr
Differential Revision: D36791608
Pulled By: pdillinger
fbshipit-source-id: a27bcf0213fc7ab177760fede50d4375d579afa6
Summary:
In case of non-TransactionDB and avoid_flush_during_recovery = true, RocksDB won't
flush the data from WAL to L0 for all column families if possible. As a
result, not all column families can increase their log_numbers, and
min_log_number_to_keep won't change.
For transaction DB (.allow_2pc), even with the flush, there may be old WAL files that it must not delete because they can contain data of uncommitted transactions and min_log_number_to_keep won't change.
If we persist a new MANIFEST with
advanced log_numbers for some column families, then during a second
crash after persisting the MANIFEST, RocksDB will see some column
families' log_numbers larger than the corrupted wal, and the "column family inconsistency" error will be hit, causing recovery to fail.
As a solution, RocksDB will persist the new MANIFEST after successfully syncing the new WAL.
If a future recovery starts from the new MANIFEST, then it means the new WAL is successfully synced. Due to the sentinel empty write batch at the beginning, kPointInTimeRecovery of WAL is guaranteed to go after this point.
If future recovery starts from the old MANIFEST, it means the writing the new MANIFEST failed. We won't have the "SST ahead of WAL" error.
Currently, RocksDB DB::Open() may creates and writes to two new MANIFEST files even before recovery succeeds. This PR buffers the edits in a structure and writes to a new MANIFEST after recovery is successful
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9922
Test Plan:
1. Update unit tests to fail without this change
2. make crast_test -j
Branch with unit test and no fix https://github.com/facebook/rocksdb/pull/9942 to keep track of unit test (without fix)
Reviewed By: riversand963
Differential Revision: D36043701
Pulled By: akankshamahajan15
fbshipit-source-id: 5760970db0a0920fb73d3c054a4155733500acd9
Summary:
This variable is actually not being used for anything meaningful, thus remove it.
This can make https://github.com/facebook/rocksdb/issues/7516 slightly simpler by reducing the amount of state that must be made lock-free.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10078
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D36779817
Pulled By: riversand963
fbshipit-source-id: ffb0d9ad6149616917ae5e02bb28102cb90fc406
Summary:
After https://github.com/facebook/rocksdb/issues/9984, BackupEngineTest.Concurrency becomes flaky.
During DB::Open(), someone else can rename/remove the LOG file, causing
this thread's `CreateLoggerFromOptions()` to fail. The reason is that the operation sequence
of "FileExists -> Rename" is not atomic. It's possible that a FileExists() returns OK, but the file
gets deleted before Rename(), causing the latter to return IOError with PathNotFound subcode.
Although it's not encouraged to concurrently modify the contents of the directories managed by
the database instance in this case, we can still perform some simple handling to make DB::Open()
more robust. In this case, we can check if a racing thread has deleted the original LOG file, we can
allow this thread to continue creating a new LOG file.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10069
Test Plan: ~/gtest-parallel/gtest-parallel -r 100 ./backup_engine_test --gtest_filter=BackupEngineTest.Concurrency
Reviewed By: jay-zhuang
Differential Revision: D36736913
Pulled By: riversand963
fbshipit-source-id: 3cbe92d77ca175e55e586bdb1a32ac8107217ae6
Summary:
Fix the unittest `ExternalSSTFileBasicTest.StableSnapshotWhileLoggingToManifest` introduced in https://github.com/facebook/rocksdb/issues/10051 that is failing.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10066
Test Plan: CI
Reviewed By: ajkr
Differential Revision: D36720669
Pulled By: cbi42
fbshipit-source-id: 47a6d2c161f27b605ede5c62d1776eecaf0d5363
Summary:
TSAN test is slower, for `TransactionStressTest` and
`DeadlockStress`, they're reaching the timeout limit of 600 seconds.
Decreasing the transaction test number.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10063
Test Plan: CI
Reviewed By: ajkr
Differential Revision: D36711727
Pulled By: jay-zhuang
fbshipit-source-id: 600f82a6d32108f52fbe5572fcc7497607b7fe98
Summary:
Tests could hang because of flags are not test and set
atomiclly, so it's waiting for a sync point forever.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10060
Test Plan: CI
Reviewed By: ajkr
Differential Revision: D36706311
Pulled By: jay-zhuang
fbshipit-source-id: d54b8053ce51b2de74162b28f496c048519b6cde
Summary:
For regular db instance and secondary instance, we return error and refuse to open DB if Logger creation fails.
Our current code allows it, but it is really difficult to debug because
there will be no LOG files. The same for OPTIONS file, which will be explored in another PR.
Furthermore, Arena::AllocateAligned(size_t bytes, size_t huge_page_size, Logger* logger) has an
assertion as the following:
```cpp
#ifdef MAP_HUGETLB
if (huge_page_size > 0 && bytes > 0) {
assert(logger != nullptr);
}
#endif
```
It can be removed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9984
Test Plan: make check
Reviewed By: jay-zhuang
Differential Revision: D36347754
Pulled By: riversand963
fbshipit-source-id: 529798c0511d2eaa2f0fd40cf7e61c4cbc6bc57e
Summary:
RocksDB uses the (no longer aptly named) SST file manager (see https://github.com/facebook/rocksdb/wiki/Managing-Disk-Space-Utilization) to track and potentially limit the space used by SST and blob files (as well as to rate-limit the deletion of these data files). The SST file manager tracks the SST and blob file sizes in an in-memory hash map, which has to be rebuilt during DB open. File sizes can be generally obtained by querying the file system; however, there is a performance optimization possibility here since the sizes of SST and blob files are also tracked in the RocksDB MANIFEST, so we can simply pass the file sizes stored there instead of consulting the file system for each file. Currently, this optimization is only implemented for SST files; we would like to extend it to blob files as well.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10062
Test Plan:
Add unit tests for the change to the test suite
ltamasi riversand963 akankshamahajan15
Reviewed By: ltamasi
Differential Revision: D36726621
Pulled By: gangliao
fbshipit-source-id: 4010dc46ef7306142f1c2e0d1c3bf75b196ef82a
Summary:
This PR adds timestamp support to the secondary DB instance.
With this, these timestamp related APIs are supported:
ReadOptions.timestamp : read should return the latest data visible to this specified timestamp
Iterator::timestamp() : returns the timestamp associated with the key, value
DB:Get(..., std::string* timestamp) : returns the timestamp associated with the key, value in timestamp
Test plan (on devserver):
```
$COMPILE_WITH_ASAN=1 make -j24 all
$./db_secondary_test --gtest_filter=DBSecondaryTestWithTimestamp*
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10061
Reviewed By: riversand963
Differential Revision: D36722915
Pulled By: jowlyzhang
fbshipit-source-id: 644ada39e4e51164a759593478c38285e0c1a666
Summary:
There are currently some preprocessor checks that assume support for Visual Studio versions older than 2015 (i.e., 0 < _MSC_VER < 1900), although we don't support them any more.
We removed all code that only compiles on those older versions, except third-party/ files.
The ROCKSDB_NOEXCEPT symbol is now obsolete, since it now always gets replaced by noexcept. We removed it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10065
Reviewed By: pdillinger
Differential Revision: D36721901
Pulled By: guidotag
fbshipit-source-id: a2892d365ef53cce44a0a7d90dd6b72ee9b5e5f2
Summary:
Thanks to https://github.com/facebook/rocksdb/issues/9919 and https://github.com/facebook/rocksdb/issues/10051 the known bugs in file ingestion (besides mmap read + file checksum) are fixed. Now we can try again to enable file ingestion in crash test.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9357
Test Plan: stress file ingestion heavily for an hour: `$ TEST_TMPDIR=/dev/shm python3 tools/db_crashtest.py blackbox --max_key=1000000 --ingest_external_file_one_in=100 --duration=3600 --interval=20 --write_buffer_size=524288 --target_file_size_base=524288 --max_bytes_for_level_base=2097152`
Reviewed By: riversand963
Differential Revision: D33410746
Pulled By: ajkr
fbshipit-source-id: d276431390995a67f68390d61c06a40945fdd280
Summary:
Add `rocksdb_disable_manual_compaction` and `rocksdb_enable_manual_compaction`.
Note that `rocksdb_enable_manual_compaction` should be used with care and must not be called more times than `rocksdb_disable_manual_compaction` has been called.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10052
Reviewed By: ajkr
Differential Revision: D36665496
Pulled By: jay-zhuang
fbshipit-source-id: a4ae6e34694066feb21302ca1a5c365fb9de0ec7
Summary:
Iterator is not freed after test is done (after the main for
loop), which could cause db close failed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10058
Test Plan:
Able to reproduce consistently with higher thread number,
like 100, make sure it passes after the fix
Reviewed By: ajkr
Differential Revision: D36685823
Pulled By: jay-zhuang
fbshipit-source-id: 4c98b8758d106bfe40cae670e689c3d284765bcf
Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10053
Need to exit if ldb command fails, to avoid running db_bench on
empty/bad DB and considering the results valid.
Reviewed By: jay-zhuang
Differential Revision: D36673200
fbshipit-source-id: e0d78a0d397e0e335d82d9349bfd612d38ffb552
Summary:
Right now, in FindObsoleteFiles() we build a list of all live SST files from all existing Versions. This is all done in DB mutex, and is O(m*n) where m is number of versions and n is number of files. In some extereme cases, it can take very long. The list is used to see whether a candidate file still shows up in a version. With this commit, every candidate file is directly check against all the versions for file existance. This operation would be O(m*k) where k is number of candidate files. Since is usually small (except perhaps full compaction in universal compaction), this is usually much faster than the previous solution.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10040
Test Plan: TBD
Reviewed By: riversand963
Differential Revision: D36613391
fbshipit-source-id: 3f13b090f755d9b3ae417faec62cd6e798bac1eb
Summary:
This PR fixes the issue of unstable snapshot during external SST file ingestion. Credit ajkr for the following walk through: consider these relevant steps for of IngestExternalFile():
(1) increase seqno while holding mutex -- 677d2b4a8f/db/db_impl/db_impl.cc (L4768)
(2) LogAndApply() -- 677d2b4a8f/db/db_impl/db_impl.cc (L4797-L4798)
(a) write to MANIFEST with mutex released a96a4a2f7b/db/version_set.cc (L4407)
(b) apply to in-memory state with mutex held
A snapshot taken during (2a) will be unstable. In particular, queries against that snapshot will not include data from the ingested file before (2b), and will include data from the ingested file after (2b).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10051
Test Plan:
Added a new unit test: `ExternalSSTFileBasicTest.WriteAfterReopenStableSnapshotWhileLoggingToManifest`.
```
make external_sst_file_basic_test
./external_sst_file_basic_test
```
Reviewed By: ajkr
Differential Revision: D36654033
Pulled By: cbi42
fbshipit-source-id: bf720cca313e0cf211585960f3aff04853a31b96
Summary:
This PR wants to improve support for transaction in C-API:
* Support two-phase commit.
* Support `get_pinned` and `multi_get` in transaction.
* Add `rocksdb_transactiondb_flush`
* Support get writebatch from transaction and rebuild transaction from writebatch.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9252
Reviewed By: jay-zhuang
Differential Revision: D36459007
Pulled By: riversand963
fbshipit-source-id: 47371d527be821c496353a7fe2fd18d628069a98
Summary:
There are some time-related POSIX APIs that are not available on Windows
(e.g. `localtime_r`), which we have worked around by providing our own
implementations in `port/sys_time.h`. This workaround actually relies on
some ambiguity: on Windows, a call to `localtime_r` calls
`ROCKSDB_NAMESPACE::port::localtime_r` (which is pulled into
`ROCKSDB_NAMESPACE` by a using-declaration), while on other platforms
it calls the global `localtime_r`. This works fine as long as there is only one
candidate function; however, it breaks down when there is more than one
`localtime_r` visible in a scope.
The patch fixes this by introducing `ROCKSDB_NAMESPACE::port::{TimeVal, GetTimeOfDay, LocalTimeR}`
to eliminate any ambiguity.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10045
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D36639372
Pulled By: ltamasi
fbshipit-source-id: fc13dbfa421b7c8918111a6d9e24ce77e91a7c50
Summary:
https://github.com/facebook/rocksdb/issues/9857 introduced new an option `use_zstd_dict_trainer`, which
is stored in SST as text, e.g.:
```
... zstd_max_train_bytes=0; enabled=0;...
```
it increased the sst size a little bit and cause
`ApproximateOffsetOfCompressed` test to fail:
```
Value 7053 is not in range [4000, 7050]
table/table_test.cc:4019: Failure
Value of: Between(c.ApproximateOffsetOf("xyz"), 4000, 7050)
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10048
Test Plan: verified the test pass after the change
Reviewed By: cbi42
Differential Revision: D36643688
Pulled By: jay-zhuang
fbshipit-source-id: bf12d211f6ae71937259ef21b1226bd06e8da717
Summary:
For example, the default ZSTD version for ubuntu20 is 1.4.4, which will
fail the test `PresetCompressionDict`:
```
db/db_test_util.cc:607: Failure
Invalid argument: zstd finalizeDictionary cannot be used because ZSTD 1.4.5+ is not linked with the binary.
terminate called after throwing an instance of 'testing::internal::GoogleTestFailureException'
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10046
Test Plan: test pass with old zstd
Reviewed By: cbi42
Differential Revision: D36640067
Pulled By: jay-zhuang
fbshipit-source-id: b1c49fb7295f57f4515ce4eb3a52ae7d7e45da86
Summary:
In LRU Cache mutex, we sometimes call malloc_usable_size() to calculate memory used by the metadata object. We prevent it by saving the charge + metadata size, rather than charge, inside the metadata itself. Within the mutex, usually only total charge is needed so we don't need to repeat.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10026
Test Plan: Run existing tests.
Reviewed By: pdillinger
Differential Revision: D36556253
fbshipit-source-id: f60c96d13cde3af77732e5548e4eac4182fa9801
Summary:
This PR is the second and last part for adding user defined timestamp support to read only DB. Specifically, the change in this PR includes:
- `options.timestamp` respected by `CompactedDBImpl::Get` and `CompactedDBImpl::MultiGet` to return results visible up till that timestamp.
- `CompactedDBImpl::Get(...,std::string* timestsamp)` and `CompactedDBImpl::MultiGet(std::vector<std::string>* timestamps)` return the timestamp(s) associated with the key(s).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10030
Test Plan:
```
$COMPILE_WITH_ASAN=1 make -j24 all
$./db_readonly_with_timestamp_test --gtest_filter="DBReadOnlyTestWithTimestamp.CompactedDB*"
$./db_basic_test --gtest_filter="DBBasicTest.CompactedDB*"
$make all check
```
Reviewed By: riversand963
Differential Revision: D36613926
Pulled By: jowlyzhang
fbshipit-source-id: 5b7ed7fef822708c12e2caf7a8d2deb6a696f0f0
Summary:
Added rate limiter and read rate-limiting support to SequentialFileReader. I've updated call sites to SequentialFileReader::Read with appropriate IO priority (or left a TODO and specified IO_TOTAL for now).
The PR is separated into four commits: the first one added the rate-limiting support, but with some fixes in the unit test since the number of request bytes from rate limiter in SequentialFileReader are not accurate (there is overcharge at EOF). The second commit fixed this by allowing SequentialFileReader to check file size and determine how many bytes are left in the file to read. The third commit added benchmark related code. The fourth commit moved the logic of using file size to avoid overcharging the rate limiter into backup engine (the main user of SequentialFileReader).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9973
Test Plan:
- `make check`, backup_engine_test covers usage of SequentialFileReader with rate limiter.
- Run db_bench to check if rate limiting is throttling as expected: Verified that reads and writes are together throttled at 2MB/s, and at 0.2MB chunks that are 100ms apart.
- Set up: `./db_bench --benchmarks=fillrandom -db=/dev/shm/test_rocksdb`
- Benchmark:
```
strace -ttfe read,write ./db_bench --benchmarks=backup -db=/dev/shm/test_rocksdb --backup_rate_limit=2097152 --use_existing_db
strace -ttfe read,write ./db_bench --benchmarks=restore -db=/dev/shm/test_rocksdb --restore_rate_limit=2097152 --use_existing_db
```
- db bench on backup and restore to ensure no performance regression.
- backup (avg over 50 runs): pre-change: 1.90443e+06 micros/op; post-change: 1.8993e+06 micros/op (improve by 0.2%)
- restore (avg over 50 runs): pre-change: 1.79105e+06 micros/op; post-change: 1.78192e+06 micros/op (improve by 0.5%)
```
# Set up
./db_bench --benchmarks=fillrandom -db=/tmp/test_rocksdb -num=10000000
# benchmark
TEST_TMPDIR=/tmp/test_rocksdb
NUM_RUN=50
for ((j=0;j<$NUM_RUN;j++))
do
./db_bench -db=$TEST_TMPDIR -num=10000000 -benchmarks=backup -use_existing_db | egrep 'backup'
# Restore
#./db_bench -db=$TEST_TMPDIR -num=10000000 -benchmarks=restore -use_existing_db
done > rate_limit.txt && awk -v NUM_RUN=$NUM_RUN '{sum+=$3;sum_sqrt+=$3^2}END{print sum/NUM_RUN, sqrt(sum_sqrt/NUM_RUN-(sum/NUM_RUN)^2)}' rate_limit.txt >> rate_limit_2.txt
```
Reviewed By: hx235
Differential Revision: D36327418
Pulled By: cbi42
fbshipit-source-id: e75d4307cff815945482df5ba630c1e88d064691
Summary:
RocksDB snapshot already has a member unix_time_ set after
snapshot is taken. It is now exposed through GetSnapshotTime() API.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9923
Test Plan: Update unit tests
Reviewed By: riversand963
Differential Revision: D36048275
Pulled By: akankshamahajan15
fbshipit-source-id: 825210ec287deb0bc3aaa9b8e1f079f07ad686fa
Summary:
The build failed due to different namespaces for coroutines (std::experimental vs std) based on compiler version.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10041
Reviewed By: ltamasi
Differential Revision: D36617212
Pulled By: anand1976
fbshipit-source-id: dfb25320788d32969317d5651173059e2cbd8bd5
Guido Tagliavini Ponce