Summary:
This is for https://github.com/facebook/rocksdb/issues/9737
I have wasted more than a few hours running db_bench benchmarks where --seed was not set
and getting better than expected results because cache hit rates are great because
multiple invocations of db_bench used the same value for --seed or did not set it,
and then all used 0. The result is that all see the same sequence of keys.
Others have done the same. The problem is worse in that it is easy to miss and the result is a benchmark with results that are misleading.
A good way to avoid this is to set it to the equivalent of gettimeofday() when either
--seed is not set or it is set to 0 (the default).
With this change the actual seed is printed when it was 0 at process start:
Set seed to 1647992570365606 because --seed was 0
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9740
Test Plan:
Perf results:
./db_bench --benchmarks=fillseq,readrandom --num=1000000 --reads=4000000
readrandom : 6.469 micros/op 154583 ops/sec; 17.1 MB/s (4000000 of 4000000 found)
./db_bench --benchmarks=fillseq,readrandom --num=1000000 --reads=4000000 --seed=0
readrandom : 6.565 micros/op 152321 ops/sec; 16.9 MB/s (4000000 of 4000000 found)
./db_bench --benchmarks=fillseq,readrandom --num=1000000 --reads=4000000 --seed=1
readrandom : 6.461 micros/op 154777 ops/sec; 17.1 MB/s (4000000 of 4000000 found)
./db_bench --benchmarks=fillseq,readrandom --num=1000000 --reads=4000000 --seed=2
readrandom : 6.525 micros/op 153244 ops/sec; 17.0 MB/s (4000000 of 4000000 found)
Reviewed By: jay-zhuang
Differential Revision: D35145361
Pulled By: mdcallag
fbshipit-source-id: 2b35b153ccec46b27d7c9405997523555fc51267
Summary:
This adds the --slow_usecs option with a default value of 1M. Operations that
take this much time have a message printed when --histogram=1, --stats_interval=0
and --stats_interval_seconds=0. The current code hardwired this to 20,000 usecs
and for some stress tests that reduced throughput by 20% or more.
This is for https://github.com/facebook/rocksdb/issues/9620
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9732
Test Plan:
./db_bench --benchmarks=fillrandom,readrandom --compression_type=lz4 --slow_usecs=100 --histogram=1
./db_bench --benchmarks=fillrandom,readrandom --compression_type=lz4 --slow_usecs=100000 --histogram=1
Reviewed By: jay-zhuang
Differential Revision: D35121522
Pulled By: mdcallag
fbshipit-source-id: daf27f937efd748980545d6395db332712fc078b
Summary:
db_bench quietly parses and ignores bad values for --compaction_fadvice and --value_size_distribution_type
I prefer that it fail for them as it does for bad option values in most other cases. Otherwise a benchmark
result will be provided for the wrong configuration and the result will be misleading.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9741
Test Plan:
These now fail:
./db_bench --compaction_fadvice=noney
Unknown compaction fadvice:noney
./db_bench --value_size_distribution_type=norma
Cannot parse distribution type 'norma'
While correct values continue to work:
./db_bench --value_size_distribution_type=normal
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
./db_bench --compaction_fadvice=none
Initializing RocksDB Options from the specified file
Initializing RocksDB Options from command-line flags
Reviewed By: siying
Differential Revision: D35115973
Pulled By: mdcallag
fbshipit-source-id: c2b10de5c2d1ea7c7539e676f5bd556351f5d370
Summary:
When --benchmarks has more than one test then the threads in one benchmark
will use the same set of seeds as the threads in the previous benchmark.
This diff fixe that.
This fixes https://github.com/facebook/rocksdb/issues/9632
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9733
Test Plan:
For this command line the block cache is 8GB, so it caches at most 1024 8KB blocks. Note that without
this diff the second run of readrandom has a much better response time because seed reuse means the
second run reads the same 1000 blocks as the first run and they are cached at that point. But with
this diff that does not happen.
./db_bench --benchmarks=fillseq,flush,compact0,waitforcompaction,levelstats,readrandom,readrandom --compression_type=zlib --num=10000000 --reads=1000 --block_size=8192
...
```
Level Files Size(MB)
--------------------
0 0 0
1 11 238
2 9 253
3 0 0
4 0 0
5 0 0
6 0 0
```
--- perf results without this diff
DB path: [/tmp/rocksdbtest-2260/dbbench]
readrandom : 46.212 micros/op 21618 ops/sec; 2.4 MB/s (1000 of 1000 found)
DB path: [/tmp/rocksdbtest-2260/dbbench]
readrandom : 21.963 micros/op 45450 ops/sec; 5.0 MB/s (1000 of 1000 found)
--- perf results with this diff
DB path: [/tmp/rocksdbtest-2260/dbbench]
readrandom : 47.213 micros/op 21126 ops/sec; 2.3 MB/s (1000 of 1000 found)
DB path: [/tmp/rocksdbtest-2260/dbbench]
readrandom : 42.880 micros/op 23299 ops/sec; 2.6 MB/s (1000 of 1000 found)
Reviewed By: jay-zhuang
Differential Revision: D35089763
Pulled By: mdcallag
fbshipit-source-id: 1b50143a07afe876b8c8e5fa50dd94a8ce57fc6b
Summary:
This changes db_bench to fail at startup for invalid compression types. It had been
changing them to Snappy. For other invalid options it fails at startup.
This is for https://github.com/facebook/rocksdb/issues/9621
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9729
Test Plan:
This continues to work:
./db_bench --benchmarks=fillrandom --compression_type=lz4
This now fails rather than changing the compression type to Snappy
./db_bench --benchmarks=fillrandom --compression_type=lz44
Cannot parse compression type 'lz44'
Reviewed By: jay-zhuang
Differential Revision: D35081323
Pulled By: mdcallag
fbshipit-source-id: 9b38c835abddce11aa7feb235df63f53cf829981
Summary:
…in order
This fixes https://github.com/facebook/rocksdb/issues/9650
For db_bench --benchmarks=fillseq --num_multi_db=X it loads databases in sequence
rather than randomly choosing a database per Put. The benefits are:
1) avoids long delays between flushing memtables
2) avoids flushing memtables for all of them at the same point in time
3) puts same number of keys per database so that query tests will find keys as expected
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9713
Test Plan:
Using db_bench.1 without the change and db_bench.2 with the change:
for i in 1 2; do rm -rf /data/m/rx/* ; time ./db_bench.$i --db=/data/m/rx --benchmarks=fillseq --num_multi_db=4 --num=10000000; du -hs /data/m/rx ; done
--- without the change
fillseq : 3.188 micros/op 313682 ops/sec; 34.7 MB/s
real 2m7.787s
user 1m52.776s
sys 0m46.549s
2.7G /data/m/rx
--- with the change
fillseq : 3.149 micros/op 317563 ops/sec; 35.1 MB/s
real 2m6.196s
user 1m51.482s
sys 0m46.003s
2.7G /data/m/rx
Also, temporarily added a printf to confirm that the code switches to the next database at the right time
ZZ switch to db 1 at 10000000
ZZ switch to db 2 at 20000000
ZZ switch to db 3 at 30000000
for i in 1 2; do rm -rf /data/m/rx/* ; time ./db_bench.$i --db=/data/m/rx --benchmarks=fillseq,readrandom --num_multi_db=4 --num=100000; du -hs /data/m/rx ; done
--- without the change, smaller database, note that not all keys are found by readrandom because databases have < and > --num keys
fillseq : 3.176 micros/op 314805 ops/sec; 34.8 MB/s
readrandom : 1.913 micros/op 522616 ops/sec; 57.7 MB/s (99873 of 100000 found)
--- with the change, smaller database, note that all keys are found by readrandom
fillseq : 3.110 micros/op 321566 ops/sec; 35.6 MB/s
readrandom : 1.714 micros/op 583257 ops/sec; 64.5 MB/s (100000 of 100000 found)
Reviewed By: jay-zhuang
Differential Revision: D35030168
Pulled By: mdcallag
fbshipit-source-id: 2a18c4ec571d954cf5a57b00a11802a3608823ee
Summary:
Changes:
* improves monitoring by displaying average size of a Put value and average scan length
* forces the minimum value size to be 10. Before this it was 0 if you didn't set the distribution parameters.
* uses reasonable defaults for the distribution parameters that determine value size and scan length
* includes seeks in "reads ... found" message, before this they were missing
This is for https://github.com/facebook/rocksdb/issues/9672
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9711
Test Plan:
Before this change:
./db_bench --benchmarks=fillseq,mixgraph --mix_get_ratio=50 --mix_put_ratio=25 --mix_seek_ratio=25 --num=100000 --value_k=0.2615 --value_sigma=25.45 --iter_k=2.517 --iter_sigma=14.236
fillseq : 4.289 micros/op 233138 ops/sec; 25.8 MB/s
mixgraph : 18.461 micros/op 54166 ops/sec; 755.0 MB/s ( Gets:50164 Puts:24919 Seek:24917 of 50164 in 75081 found)
After this change:
./db_bench --benchmarks=fillseq,mixgraph --mix_get_ratio=50 --mix_put_ratio=25 --mix_seek_ratio=25 --num=100000 --value_k=0.2615 --value_sigma=25.45 --iter_k=2.517 --iter_sigma=14.236
fillseq : 3.974 micros/op 251553 ops/sec; 27.8 MB/s
mixgraph : 16.722 micros/op 59795 ops/sec; 833.5 MB/s ( Gets:50164 Puts:24919 Seek:24917, reads 75081 in 75081 found, avg size: 36.0 value, 504.9 scan)
Reviewed By: jay-zhuang
Differential Revision: D35030190
Pulled By: mdcallag
fbshipit-source-id: d8f555f28d869f752ddb674a524108884511b151
Summary:
The goal of this change is to allow changes to the "current" (in
FileSystem) file temperatures to feed back into DB metadata, so that
they can inform decisions and stats reporting. In part because of
modular code factoring, it doesn't seem easy to do this automagically,
where opening an SST file and observing current Temperature different
from expected would trigger a change in metadata and DB manifest write
(essentially giving the deep read path access to the write path). It is also
difficult to do this while the DB is open because of the limitations of
LogAndApply.
This change allows updating file temperature metadata on a closed DB
using an experimental utility function UpdateManifestForFilesState()
or `ldb update_manifest --update_temperatures`. This should suffice for
"migration" scenarios where outside tooling has placed or re-arranged DB
files into a (different) tiered configuration without going through
RocksDB itself (currently, only compaction can change temperature
metadata).
Some details:
* Refactored and added unit test for `ldb unsafe_remove_sst_file` because
of shared functionality
* Pulled in autovector.h changes from https://github.com/facebook/rocksdb/issues/9546 to fix SuperVersionContext
move constructor (related to an older draft of this change)
Possible follow-up work:
* Support updating manifest with file checksums, such as when a
new checksum function is used and want existing DB metadata updated
for it.
* It's possible that for some repair scenarios, lighter weight than
full repair, we might want to support UpdateManifestForFilesState() to
modify critical file details like size or checksum using same
algorithm. But let's make sure these are differentiated from modifying
file details in ways that don't suspect corruption (or require extreme
trust).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9683
Test Plan: unit tests added
Reviewed By: jay-zhuang
Differential Revision: D34798828
Pulled By: pdillinger
fbshipit-source-id: cfd83e8fb10761d8c9e7f9c020d68c9106a95554
Summary:
The primary goal of this change is to add support for backing up and
restoring (applying on restore) file temperature metadata, without
committing to either the DB manifest or the FS reported "current"
temperatures being exclusive "source of truth".
To achieve this goal, we need to add temperature information to backup
metadata, which requires updated backup meta schema. Fortunately I
prepared for this in https://github.com/facebook/rocksdb/issues/8069, which began forward compatibility in version
6.19.0 for this kind of schema update. (Previously, backup meta schema
was not extensible! Making this schema update public will allow some
other "nice to have" features like taking backups with hard links, and
avoiding crc32c checksum computation when another checksum is already
available.) While schema version 2 is newly public, the default schema
version is still 1. Until we change the default, users will need to set
to 2 to enable features like temperature data backup+restore. New
metadata like temperature information will be ignored with a warning
in versions before this change and since 6.19.0. The metadata is
considered ignorable because a functioning DB can be restored without
it.
Some detail:
* Some renaming because "future schema" is now just public schema 2.
* Initialize some atomics in TestFs (linter reported)
* Add temperature hint support to SstFileDumper (used by BackupEngine)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9660
Test Plan:
related unit test majorly updated for the new functionality,
including some shared testing support for tracking temperatures in a FS.
Some other tests and testing hooks into production code also updated for
making the backup meta schema change public.
Reviewed By: ajkr
Differential Revision: D34686968
Pulled By: pdillinger
fbshipit-source-id: 3ac1fa3e67ee97ca8a5103d79cc87d872c1d862a
Summary:
BlockBasedTableOptions.hash_index_allow_collision is already deprecated and has no effect. Delete it for preparing 7.0 release.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9454
Test Plan: Run all existing tests.
Reviewed By: ajkr
Differential Revision: D33805827
fbshipit-source-id: ed8a436d1d083173ec6aef2a762ba02e1eefdc9d
Summary:
**Summary:**
RocksDB uses a block cache to reduce IO and make queries more efficient. The block cache is based on the LRU algorithm (LRUCache) and keeps objects containing uncompressed data, such as Block, ParsedFullFilterBlock etc. It allows the user to configure a second level cache (rocksdb::SecondaryCache) to extend the primary block cache by holding items evicted from it. Some of the major RocksDB users, like MyRocks, use direct IO and would like to use a primary block cache for uncompressed data and a secondary cache for compressed data. The latter allows us to mitigate the loss of the Linux page cache due to direct IO.
This PR includes a concrete implementation of rocksdb::SecondaryCache that integrates with compression libraries such as LZ4 and implements an LRU cache to hold compressed blocks.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9518
Test Plan:
In this PR, the lru_secondary_cache_test.cc includes the following tests:
1. The unit tests for the secondary cache with either compression or no compression, such as basic tests, fails tests.
2. The integration tests with both primary cache and this secondary cache .
**Follow Up:**
1. Statistics (e.g. compression ratio) will be added in another PR.
2. Once this implementation is ready, I will do some shadow testing and benchmarking with UDB to measure the impact.
Reviewed By: anand1976
Differential Revision: D34430930
Pulled By: gitbw95
fbshipit-source-id: 218d78b672a2f914856d8a90ff32f2f5b5043ded
Summary:
When WAL compression is enabled, add a record (new record type) to store the compression type to indicate that all subsequent records are compressed. The log reader will store the compression type when this record is encountered and use the type to uncompress the subsequent records. Compress and uncompress to be implemented in subsequent diffs.
Enabled WAL compression in some WAL tests to check for regressions. Some tests that rely on offsets have been disabled.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9556
Reviewed By: anand1976
Differential Revision: D34308216
Pulled By: sidroyc
fbshipit-source-id: 7f10595e46f3277f1ea2d309fbf95e2e935a8705
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
Summary:
Opening DB as seconeary instance has been supported in ldb but it is not mentioned in --help. Mention it there. The part of the help message after the modification:
```
commands MUST specify --db=<full_path_to_db_directory> when necessary
commands can optionally specify
--env_uri=<uri_of_environment> or --fs_uri=<uri_of_filesystem> if necessary
--secondary_path=<secondary_path> to open DB as secondary instance. Operations not supported in secondary instance will fail.
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9582
Test Plan: Build and run ldb --help
Reviewed By: riversand963
Differential Revision: D34286427
fbshipit-source-id: e56c5290d0548098ab6acc6dde2167f5a64f34f3
Summary:
I did another pass through running CI jobs. It is uncommon now to see
`db_stress` stuck in the setup phase but still happen.
One reason was repeatedly reading/verifying checksum on filter blocks when
`-cache_index_and_filter_blocks=1` and `-cache_size=1048576`. To address
that I increased the cache size.
Another reason was having a WAL with many range tombstones and every
`db_stress` run using `-avoid_flush_during_recovery=1` (in that
scenario, the setup phase spent too much CPU in
`rocksdb::MemTable::NewRangeTombstoneIteratorInternal()`). To address
that I fixed the `-avoid_flush_during_recovery` setting so it is
reevaluated for every `db_stress` run.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9483
Reviewed By: riversand963
Differential Revision: D33922929
Pulled By: ajkr
fbshipit-source-id: 0a298ec7c4df6f6b44620233996047a2dc7ee5f3
Summary:
This change removes the ability to configure the deprecated,
inefficient block-based filter in the public API. Options that would
have enabled it now use "full" (and optionally partitioned) filters.
Existing block-based filters can still be read and used, and a "back
door" way to build them still exists, for testing and in case of trouble.
About the only way this removal would cause an issue for users is if
temporary memory for filter construction greatly increases. In
HISTORY.md we suggest a few possible mitigations: partitioned filters,
smaller SST files, or setting reserve_table_builder_memory=true.
Or users who have customized a FilterPolicy using the
CreateFilter/KeyMayMatch mechanism removed in https://github.com/facebook/rocksdb/issues/9501 will have to upgrade
their code. (It's long past time for people to move to the new
builder/reader customization interface.)
This change also introduces some internal-use-only configuration strings
for testing specific filter implementations while bypassing some
compatibility / intelligence logic. This is intended to hint at a path
toward making FilterPolicy Customizable, but it also gives us a "back
door" way to configure block-based filter.
Aside: updated db_bench so that -readonly implies -use_existing_db
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9535
Test Plan:
Unit tests updated. Specifically,
* BlockBasedTableTest.BlockReadCountTest is tweaked to validate the back
door configuration interface and ignoring of `use_block_based_builder`.
* BlockBasedTableTest.TracingGetTest is migrated from testing
block-based filter access pattern to full filter access patter, by
re-ordering some things.
* Options test (pretty self-explanatory)
Performance test - create with `./db_bench -db=/dev/shm/rocksdb1 -bloom_bits=10 -cache_index_and_filter_blocks=1 -benchmarks=fillrandom -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0` with and without `-use_block_based_filter`, which creates a DB with 21 SST files in L0. Read with `./db_bench -db=/dev/shm/rocksdb1 -readonly -bloom_bits=10 -cache_index_and_filter_blocks=1 -benchmarks=readrandom -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=10000 -fifo_compaction_allow_compaction=0 -duration=30`
Without -use_block_based_filter: readrandom 464 ops/sec, 689280 KB DB
With -use_block_based_filter: readrandom 169 ops/sec, 690996 KB DB
No consistent difference with fillrandom
Reviewed By: jay-zhuang
Differential Revision: D34153871
Pulled By: pdillinger
fbshipit-source-id: 31f4a933c542f8f09aca47fa64aec67832a69738
Summary:
In RocksDB option new_table_reader_for_compaction_inputs has
not effect on Compaction or on the behavior of RocksDB library.
Therefore, we are removing it in the upcoming 7.0 release.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9443
Test Plan: CircleCI
Reviewed By: ajkr
Differential Revision: D33788508
Pulled By: akankshamahajan15
fbshipit-source-id: 324ca6f12bfd019e9bd5e1b0cdac39be5c3cec7d
Summary:
After https://github.com/facebook/rocksdb/issues/9481, we are using newer default compiler for
build-format-compatible CircleCI nightly job, which fails on building
2.2.fb.branch branch because it tries to use a pre-compiled libsnappy.a
that is checked into the repo (!). This works around that by setting
SNAPPY_LDFLAGS=-lsnappy, which is only understood by such old versions.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9517
Test Plan:
Run check_format_compatible.sh on Ubuntu 20 AWS machine,
watch nightly run
Reviewed By: hx235
Differential Revision: D34055561
Pulled By: pdillinger
fbshipit-source-id: 45f9d428dd082f026773bfa8d9dd4dad66fc9378
Summary:
The patch does some cleanup in and around `VersionStorageInfo`:
* Renames the method `PrepareApply` to `PrepareAppend` in `Version`
to make it clear that it is to be called before appending the `Version` to
`VersionSet` (via `AppendVersion`), not before applying any `VersionEdit`s.
* Introduces a helper method `VersionStorageInfo::PrepareForVersionAppend`
(called by `Version::PrepareAppend`) that encapsulates the population of the
various derived data structures in `VersionStorageInfo`, and turns the
methods computing the derived structures (`UpdateNumNonEmptyLevels`,
`CalculateBaseBytes` etc.) into private helpers.
* Changes `Version::PrepareAppend` so it only calls `UpdateAccumulatedStats`
if the `update_stats` flag is set. (Earlier, this was checked by the callee.)
Related to this, it also moves the call to `ComputeCompensatedSizes` to
`VersionStorageInfo::PrepareForVersionAppend`.
* Updates and cleans up `version_builder_test`, `version_set_test`, and
`compaction_picker_test` so `PrepareForVersionAppend` is called anytime
a new `VersionStorageInfo` is set up or saved. This cleanup also involves
splitting `VersionStorageInfoTest.MaxBytesForLevelDynamic`
into multiple smaller test cases.
* Fixes up a bunch of comments that were outdated or just plain incorrect.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9494
Test Plan: Ran `make check` and the crash test script for a while.
Reviewed By: riversand963
Differential Revision: D33971666
Pulled By: ltamasi
fbshipit-source-id: fda52faac7783041126e4f8dec0fe01bdcadf65a
Summary:
Added a CountedFileSystem that tracks a number of file operations (opens, closes, deletes, renames, flushes, syncs, fsyncs, reads, writes). This class was based on the ReportFileOpEnv from db_bench.
This is a stepping stone PR to be able to change the SpecialEnv into a SpecialFileSystem, where several of the file varieties wish to do operation counting.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9283
Reviewed By: pdillinger
Differential Revision: D33062004
Pulled By: mrambacher
fbshipit-source-id: d0d297a7fb9c48c06cbf685e5fa755c27193b6f5
Summary:
ajkr reminded me that we have a rule of not including per-kv related data in `WriteOptions`.
Namely, `WriteOptions` should not include information about "what-to-write", but should just
include information about "how-to-write".
According to this rule, `WriteOptions::timestamp` (experimental) is clearly a violation. Therefore,
this PR removes `WriteOptions::timestamp` for compliance.
After the removal, we need to pass timestamp info via another set of APIs. This PR proposes a set
of overloaded functions `Put(write_opts, key, value, ts)`, `Delete(write_opts, key, ts)`, and
`SingleDelete(write_opts, key, ts)`. Planned to add `Write(write_opts, batch, ts)`, but its complexity
made me reconsider doing it in another PR (maybe).
For better checking and returning error early, we also add a new set of APIs to `WriteBatch` that take
extra `timestamp` information when writing to `WriteBatch`es.
These set of APIs in `WriteBatchWithIndex` are currently not supported, and are on our TODO list.
Removed `WriteBatch::AssignTimestamps()` and renamed `WriteBatch::AssignTimestamp()` to
`WriteBatch::UpdateTimestamps()` since this method require that all keys have space for timestamps
allocated already and multiple timestamps can be updated.
The constructor of `WriteBatch` now takes a fourth argument `default_cf_ts_sz` which is the timestamp
size of the default column family. This will be used to allocate space when calling APIs that do not
specify a column family handle.
Also, updated `DB::Get()`, `DB::MultiGet()`, `DB::NewIterator()`, `DB::NewIterators()` methods, replacing
some assertions about timestamp to returning Status code.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8946
Test Plan:
make check
./db_bench -benchmarks=fillseq,fillrandom,readrandom,readseq,deleterandom -user_timestamp_size=8
./db_stress --user_timestamp_size=8 -nooverwritepercent=0 -test_secondary=0 -secondary_catch_up_one_in=0 -continuous_verification_interval=0
Make sure there is no perf regression by running the following
```
./db_bench_opt -db=/dev/shm/rocksdb -use_existing_db=0 -level0_stop_writes_trigger=256 -level0_slowdown_writes_trigger=256 -level0_file_num_compaction_trigger=256 -disable_wal=1 -duration=10 -benchmarks=fillrandom
```
Before this PR
```
DB path: [/dev/shm/rocksdb]
fillrandom : 1.831 micros/op 546235 ops/sec; 60.4 MB/s
```
After this PR
```
DB path: [/dev/shm/rocksdb]
fillrandom : 1.820 micros/op 549404 ops/sec; 60.8 MB/s
```
Reviewed By: ltamasi
Differential Revision: D33721359
Pulled By: riversand963
fbshipit-source-id: c131561534272c120ffb80711d42748d21badf09
Summary:
Note: rebase on and merge after https://github.com/facebook/rocksdb/pull/9349, https://github.com/facebook/rocksdb/pull/9345, (optional) https://github.com/facebook/rocksdb/pull/9393
**Context:**
(Quoted from pdillinger) Layers of information during new Bloom/Ribbon Filter construction in building block-based tables includes the following:
a) set of keys to add to filter
b) set of hashes to add to filter (64-bit hash applied to each key)
c) set of Bloom indices to set in filter, with duplicates
d) set of Bloom indices to set in filter, deduplicated
e) final filter and its checksum
This PR aims to detect corruption (e.g, unexpected hardware/software corruption on data structures residing in the memory for a long time) from b) to e) and leave a) as future works for application level.
- b)'s corruption is detected by verifying the xor checksum of the hash entries calculated as the entries accumulate before being added to the filter. (i.e, `XXPH3FilterBitsBuilder::MaybeVerifyHashEntriesChecksum()`)
- c) - e)'s corruption is detected by verifying the hash entries indeed exists in the constructed filter by re-querying these hash entries in the filter (i.e, `FilterBitsBuilder::MaybePostVerify()`) after computing the block checksum (except for PartitionFilter, which is done right after each `FilterBitsBuilder::Finish` for impl simplicity - see code comment for more). For this stage of detection, we assume hash entries are not corrupted after checking on b) since the time interval from b) to c) is relatively short IMO.
Option to enable this feature of detection is `BlockBasedTableOptions::detect_filter_construct_corruption` which is false by default.
**Summary:**
- Implemented new functions `XXPH3FilterBitsBuilder::MaybeVerifyHashEntriesChecksum()` and `FilterBitsBuilder::MaybePostVerify()`
- Ensured hash entries, final filter and banding and their [cache reservation ](https://github.com/facebook/rocksdb/issues/9073) are released properly despite corruption
- See [Filter.construction.artifacts.release.point.pdf ](https://github.com/facebook/rocksdb/files/7923487/Design.Filter.construction.artifacts.release.point.pdf) for high-level design
- Bundled and refactored hash entries's related artifact in XXPH3FilterBitsBuilder into `HashEntriesInfo` for better control on lifetime of these artifact during `SwapEntires`, `ResetEntries`
- Ensured RocksDB block-based table builder calls `FilterBitsBuilder::MaybePostVerify()` after constructing the filter by `FilterBitsBuilder::Finish()`
- When encountering such filter construction corruption, stop writing the filter content to files and mark such a block-based table building non-ok by storing the corruption status in the builder.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9342
Test Plan:
- Added new unit test `DBFilterConstructionCorruptionTestWithParam.DetectCorruption`
- Included this new feature in `DBFilterConstructionReserveMemoryTestWithParam.ReserveMemory` as this feature heavily touch ReserveMemory's impl
- For fallback case, I run `./filter_bench -impl=3 -detect_filter_construct_corruption=true -reserve_table_builder_memory=true -strict_capacity_limit=true -quick -runs 10 | grep 'Build avg'` to make sure nothing break.
- Added to `filter_bench`: increased filter construction time by **30%**, mostly by `MaybePostVerify()`
- FastLocalBloom
- Before change: `./filter_bench -impl=2 -quick -runs 10 | grep 'Build avg'`: **28.86643s**
- After change:
- `./filter_bench -impl=2 -detect_filter_construct_corruption=false -quick -runs 10 | grep 'Build avg'` (expect a tiny increase due to MaybePostVerify is always called regardless): **27.6644s (-4% perf improvement might be due to now we don't drop bloom hash entry in `AddAllEntries` along iteration but in bulk later, same with the bypassing-MaybePostVerify case below)**
- `./filter_bench -impl=2 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'` (expect acceptable increase): **34.41159s (+20%)**
- `./filter_bench -impl=2 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'` (by-passing MaybePostVerify, expect minor increase): **27.13431s (-6%)**
- Standard128Ribbon
- Before change: `./filter_bench -impl=3 -quick -runs 10 | grep 'Build avg'`: **122.5384s**
- After change:
- `./filter_bench -impl=3 -detect_filter_construct_corruption=false -quick -runs 10 | grep 'Build avg'` (expect a tiny increase due to MaybePostVerify is always called regardless - verified by removing MaybePostVerify under this case and found only +-1ns difference): **124.3588s (+2%)**
- `./filter_bench -impl=3 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'`(expect acceptable increase): **159.4946s (+30%)**
- `./filter_bench -impl=3 -detect_filter_construct_corruption=true -quick -runs 10 | grep 'Build avg'`(by-passing MaybePostVerify, expect minor increase) : **125.258s (+2%)**
- Added to `db_stress`: `make crash_test`, `./db_stress --detect_filter_construct_corruption=true`
- Manually smoke-tested: manually corrupted the filter construction in some db level tests with basic PUT and background flush. As expected, the error did get returned to users in subsequent PUT and Flush status.
Reviewed By: pdillinger
Differential Revision: D33746928
Pulled By: hx235
fbshipit-source-id: cb056426be5a7debc1cd16f23bc250f36a08ca57
Summary:
Apparently setting total_order_seek=true for DB::Get was
intended to allow accurate read semantics if the current prefix
extractor doesn't match what was used to generate SST files on
disk. But since prefix_extractor was made a mutable option in 5.14.0, we
have been able to detect this case and provide the correct semantics
regardless of the total_order_seek option. Since that time, the option
has only made Get() slower in a reasonably common case: prefix_extractor
unchanged and whole_key_filtering=false.
So this change primarily removes unnecessary effect of
total_order_seek on Get. Also cleans up some related comments.
Also adds a -total_order_seek option to db_bench and canonicalizes
handling of ReadOptions in db_bench so that command line options have
the expected association with library features. (There is potential
for change in regression test behavior, but the old behavior is likely
indefensible, or some other inconsistency would need to be fixed.)
TODO in follow-up work: there should be no reason for Get() to depend on
current prefix extractor at all.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9427
Test Plan:
Unit tests updated.
Performance (using db_bench update)
Create 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 -whole_key_filtering=0`
Test with and without `-total_order_seek` on `TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -use_existing_db -readonly -benchmarks=readrandom -num=10000000 -duration=40 -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`
Before this change, total_order_seek=false: 25188 ops/sec
Before this change, total_order_seek=true: 1222 ops/sec (~20x slower)
After this change, total_order_seek=false: 24570 ops/sec
After this change, total_order_seek=true: 25012 ops/sec (indistinguishable)
Reviewed By: siying
Differential Revision: D33753458
Pulled By: pdillinger
fbshipit-source-id: bf892f34907a5e407d9c40bd4d42f0adbcbe0014
Summary:
Despite attempts to optimize `db_stress` setup phase (i.e.,
pre-`OperateDb()`) latency in https://github.com/facebook/rocksdb/issues/9470 and https://github.com/facebook/rocksdb/issues/9475, it still always took tens
of seconds. Since we still aren't able to setup a 100M key `db_stress`
quickly, we should reduce the number of keys. This PR reduces it 4x
while increasing `value_size_mult` 4x (from its default value of 8) so
that memtables and SST files fill at a similar rate compared to before this PR.
Also disabled bzip2 compression since we'll probably never use it and
I noticed many CI runs spending majority of CPU on bzip2 decompression.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9476
Reviewed By: siying
Differential Revision: D33898520
Pulled By: ajkr
fbshipit-source-id: 855021784ad9664f2be5bce21f0339a1cf93230d
Summary:
**Context/Summary:**
AdvancedColumnFamilyOptions::rate_limit_delay_max_milliseconds has been marked as deprecated and it's time to actually remove the code.
- Keep `soft_rate_limit`/`hard_rate_limit` in `cf_mutable_options_type_info` to prevent throwing `InvalidArgument` in `GetColumnFamilyOptionsFromMap` when reading an option file still with these options (e.g, old option file generated from RocksDB before the deprecation)
- Keep `soft_rate_limit`/`hard_rate_limit` in under `OptionsOldApiTest.GetOptionsFromMapTest` to test the case mentioned above.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9455
Test Plan: Rely on my eyeball and CI
Reviewed By: ajkr
Differential Revision: D33811664
Pulled By: hx235
fbshipit-source-id: 866859427fe710354a90f1095057f80116365ff0
Summary:
In RocksDB DBOptions::skip_log_error_on_recovery is marked as
"NOT SUPPORTED" for a long time, and setting this option does not have
any effect on the behavior of RocksDB library. Therefore, we are removing it
in the upcoming 7.0 release.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9434
Test Plan: CircleCI
Reviewed By: ajkr
Differential Revision: D33763015
Pulled By: akankshamahajan15
fbshipit-source-id: 11f09643298da6c02d3dcdb090b996f4c3cfdd76
Summary:
Even after https://github.com/facebook/rocksdb/issues/9461 could see
```
Error: please specify prefix_size for test_batches_snapshots test!
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9463
Test Plan:
run `make blackbox_crashtest` for a long time. (Unfortunately,
it's taking a long time to reproduce these failures)
Reviewed By: akankshamahajan15
Differential Revision: D33838152
Pulled By: pdillinger
fbshipit-source-id: b9a73c5bbb68df53f14c22b9b52f61d1f7ef38af
Summary:
The API is deprecated long time ago. Clean up the codebase by
removing it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9462
Test Plan: CI, fake release: D33835220
Reviewed By: riversand963
Differential Revision: D33835103
Pulled By: jay-zhuang
fbshipit-source-id: 6d2dc12c8e7fdbe2700865a3e61f0e3f78bd8184
Summary:
Changes in https://github.com/facebook/rocksdb/issues/9453 could trigger
```
stderr:
Error: prefixpercent is non-zero while prefix_size is not positive!
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9461
Test Plan: run `make blackbox_crashtest` for a long time
Reviewed By: ajkr
Differential Revision: D33830751
Pulled By: pdillinger
fbshipit-source-id: be88377dcaa47e4bb7adb0347762639eff8f1476
Summary:
This also removes the obsolete names BackupableDBOptions
and UtilityDB. API users must now use BackupEngineOptions and
DBWithTTL::Open. In C API, `rocksdb_backupable_db_*` is replaced
`rocksdb_backup_engine_*`. Similar renaming in Java API.
In reference to https://github.com/facebook/rocksdb/issues/9389
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9438
Test Plan: CI
Reviewed By: mrambacher
Differential Revision: D33780269
Pulled By: pdillinger
fbshipit-source-id: 4a6cfc5c1b4c78bcad790b9d3dd13c5fdf4a1fac
Summary:
MemTable::MultiGet was not considering range tombstones before
querying Bloom filter. This means range tombstones would be skipped for
keys (or prefixes) with no other entries in the memtable. This could cause
old values for a key (in SST files) to still show up until the range tombstone
covering it has been flushed.
This is fixed by essentially disabling the memtable Bloom filter when there
are any range tombstones. (This could be better optimized in the future, but
good enough for now.)
Did some other cleanup/optimization in the same code to (more than) offset
the cost of checking on range tombstones in more cases. There is now
notable improvement when memtable_whole_key_filtering and prefix_extractor
are used together (unusual), and this makes MultiGet closer to the Get
implementation.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9453
Test Plan:
new unit test added. Added memtable Bloom to crash test.
Performance testing
--------------------
Build WAL-only DB (recovers to memtable):
```
TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -benchmarks=fillrandom -num=1000000 -write_buffer_size=250000000
```
Query test command, to maximize sensitivity to the changed code:
```
TEST_TMPDIR=/dev/shm/rocksdb ./db_bench -use_existing_db -readonly -benchmarks=multireadrandom -num=10000000 -write_buffer_size=250000000 -memtable_bloom_size_ratio=0.015 -multiread_batched -batch_size=24 -threads=8 -memtable_whole_key_filtering=$MWKF -prefix_size=$PXS
```
(Note -num here is 10x larger for mostly memtable misses)
Before & after run simultaneously, average over 10 iterations per data point, ops/sec.
MWKF=0 PXS=0 (Bloom disabled)
Before: 5724844
After: 6722066
MWKF=0 PXS=7 (prefixes hardly unique; Bloom not useful)
Before: 9981319
After: 10237990
MWKF=0 PXS=8 (prefixes unique; Bloom useful)
Before: 12081715
After: 12117603
MWKF=1 PXS=0 (whole key Bloom useful)
Before: 11944354
After: 12096085
MWKF=1 PXS=7 (whole key Bloom useful in new version; prefixes not useful in old version)
Before: 9444299
After: 11826029
MWKF=1 PXS=7 (whole key Bloom useful in new version; prefixes useful in old version)
Before: 11784465
After: 11778591
Only in this last case is the 'before' *slightly* faster, perhaps because hashing prefixes is slightly faster than hashing whole keys. Otherwise, 'after' is faster.
Reviewed By: ajkr
Differential Revision: D33805025
Pulled By: pdillinger
fbshipit-source-id: 597523cae4f4eafdf6ae6bb2bc6cb46f83b017bf
Summary:
**Context/Summary:**
AdvancedColumnFamilyOptions::soft_rate_limit/hard_rate_limit have been marked as deprecated and it's time to actually remove the code.
- Keep `soft_rate_limit`/`hard_rate_limit` in `cf_mutable_options_type_info` to prevent throwing `InvalidArgument` in `GetColumnFamilyOptionsFromMap` when reading an option file still with these options (e.g, old option file generated from RocksDB before the deprecation)
- Keep `soft_rate_limit`/`hard_rate_limit` in under `OptionsOldApiTest.GetOptionsFromMapTest` to test the case mentioned above.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9452
Test Plan: Rely on my eyeball and CI
Reviewed By: ajkr
Differential Revision: D33804938
Pulled By: hx235
fbshipit-source-id: 133d49f7ec5238d7efceeb0a3122a5792a2b9945
Summary:
Add an option to set the WAL compression algorithm - wal_compression.
TODO: WAL compression is not implemented and will only support zstd initially. Will be added in subsequent diffs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9432
Reviewed By: pdillinger
Differential Revision: D33797275
Pulled By: sidroyc
fbshipit-source-id: 8db81d9c9cea5e2e4f1445d3aecad8106137b8e7
Summary:
This PR is one proposal to resolve https://github.com/facebook/rocksdb/issues/9382.
Looking at the code, I can't think of a reason why rdb is an internal component of RocksDB: it does not require
any header files NOT in `include/rocksdb`. It's a better idea to host it somewhere else.
Plus, rdb requires python2 which is not supported any more. No fixes or improvements will be made, even for potential
security bugs (https://www.python.org/doc/sunset-python-2/).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9399
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D33641965
Pulled By: riversand963
fbshipit-source-id: 2a6a74693e5de36834f355e41d6865db206af48b
Summary:
This PR moves HDFS support from RocksDB repo to a separate repo. The new (temporary?) repo
in this PR serves as an example before we finalize the decision on where and who to host hdfs support. At this point,
people can start from the example repo and fork.
Java/JNI is not included yet, and needs to be done later if necessary.
The goal is to include this commit in RocksDB 7.0 release.
Reference:
https://github.com/ajkr/dedupfs by ajkr
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9170
Test Plan:
Follow the instructions in https://github.com/riversand963/rocksdb-hdfs-env/blob/master/README.md. Build and run db_bench and db_stress.
make check
Reviewed By: ajkr
Differential Revision: D33751662
Pulled By: riversand963
fbshipit-source-id: 22b4db7f31762ed417a20239f5a08dcd1696244f
Summary:
In response to https://github.com/facebook/rocksdb/issues/9354, this PR adds a way for users to "opt out"
of extra checks that can impact peak write performance, which
currently only includes force_consistency_checks. I considered including
some other options but did not see a db_bench performance difference.
Also clarify in comment for force_consistency_checks that it can "slow
down saturated writing."
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9363
Test Plan:
basic coverage in unit tests
Using my perf test in https://github.com/facebook/rocksdb/issues/9354 comment, I see
force_consistency_checks=true -> 725360 ops/s
force_consistency_checks=false -> 783072 ops/s
Reviewed By: mrambacher
Differential Revision: D33636559
Pulled By: pdillinger
fbshipit-source-id: 25bfd006f4844675e7669b342817dd4c6a641e84
Summary:
As title.
This is part of an fb-internal task.
First, remove all `using namespace` statements if applicable.
Next, utilize multiple build platforms and see if anything is broken.
Should anything become broken, fix the compilation errors with as little extra change as possible.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9369
Test Plan:
internal build and make check
make clean && make static_lib && cd examples && make all
Reviewed By: pdillinger
Differential Revision: D33517260
Pulled By: riversand963
fbshipit-source-id: 3fc4ce6402a073421dfd9a9b2d1c79441dca7a40
Mark Callaghan
