Summary:
and remove deprecated DB::MaxMemCompactionLevel(). In the process of pushing through a relatively clean refactoring of uses of the old functions, some other minor public APIs are also migrated from raw DB pointers to unique_ptr.
Claude did pretty much all the work, but requiring dozens of prompts to actually push through relatively clean phase out of raw DB pointers from what needed to be touched, and leaving that code in better shape. (Hundreds of `DB*` still remain all over the place even outside C and Java bindings.)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/14335
Test Plan: existing tests; no functional changes intended
Reviewed By: xingbowang, mszeszko-meta
Differential Revision: D93523820
Pulled By: pdillinger
fbshipit-source-id: e4ca22ad81cd2cfe91122d7507d7ca34fe03d043
Summary:
This change builds on https://github.com/facebook/rocksdb/issues/13540 and https://github.com/facebook/rocksdb/issues/13626 in allowing a CompressionManager / Compressor / Decompressor to use a custom compression algorithm, with a distinct CompressionType. For background, review the API comments on CompressionManager and its CompatibilityName() function.
Highlights:
* Reserve and name 127 new CompressionTypes that can be used for custom compression algorithms / schemas. In many or most cases I expect the enumerators such as `kCustomCompression8F` to be used in user code rather than casting between integers and CompressionTypes, as I expect the supported custom compression algorithms to be identifiable / enumerable at compile time.
* When using these custom compression types, a CompressionManager must use a CompatibilityName() other than the built-in one AND new format_version=7 (see below).
* When building new SST files, track the full set of CompressionTypes actually used (usually just one aside from kNoCompression), using our efficient bitset SmallEnumSet, which supports fast iteration over the bits set to 1. Ideally, to support mixed or non-mixed compression algorithms in a file as efficiently as possible, we would know the set of CompressionTypes as SST file open time.
* New schema for `TableProperties::compression_name` in format_version=7 to represent the CompressionManager's CompatibilityName(), the set of CompressionTypes used, and potentially more in the future, while keeping the data relatively human-readable.
* It would be possible to do this without a new format_version, but then the only way to ensure incompatible versions fail is with an unsupported CompressionType tag, not with a compression_name property. Therefore, (a) I prefer not to put something misleading in the `compression_name` property (a built-in compression name) when there is nuance because of a CompressionManager, and (b) I prefer better, more consistent error messages that refer to either format_version or the CompressionManager's CompatibilityName(), rather than an unrecognized custom CompressionType value (which could have come from various CompressionManagers).
* The current configured CompressionManager is passed in to TableReaders so that it (or one it knows about) can be used if it matches the CompatibilityName() used for compression in the SST file. Until the connection with ObjectRegistry is implemented, the only way to read files generated with a particular CompressionManager using custom compression algorithms is to configure it (or a known relative; see FindCompatibleCompressionManager()) in the ColumnFamilyOptions.
* Optimized snappy compression with BuiltinDecompressorV2SnappyOnly, to offset some small added overheads with the new tracking. This is essentially an early part of the planned refactoring that will get rid of the old internal compression APIs.
* Another small optimization in eliminating an unnecessary key copy in flush (builder.cc).
* Fix some handling of named CompressionManagers in CompressionManager::CreateFromString() (problem seen in https://github.com/facebook/rocksdb/issues/13647)
Smaller things:
* Adds Name() and GetId() functions to Compressor for debugging/logging purposes. (Compressor and Decompressor are not expected to be Customizable because they are only instantiated by a CompressionManager.)
* When using an explicit compression_manager, the GetId() of the CompressionManager and the Compressor used to build the file are stored as bonus entries in the compression_options table property. This table property is not parsed anywhere, so it is currently for human reading, but still could be parsed with the new underscore-prefixed bonus entries. IMHO, this is preferable to additional table properties, which would increase memory fragmentation in the TableProperties objects and likely take slightly more CPU on SST open and slightly more storage.
* ReleaseWorkingArea() function from protected to public to make wrappers work, because of a quirk in C++ (vs. Java) in which you cannot access protected members of another instance of the same class (sigh)
* Added `CompressionManager:: SupportsCompressionType()` for early options sanity checking.
Follow-up before release:
* Make format_version=7 official / supported
* Stress test coverage
Sooner than later:
* Update tests for RoundRobinManager and SimpleMixedCompressionManager to take advantage of e.g. set of compression types in compression_name property
* ObjectRegistry stuff
* Refactor away old internal compression APIs
Pull Request resolved: https://github.com/facebook/rocksdb/pull/13659
Test Plan:
Basic unit test added.
## Performance
### SST write performance
```
SUFFIX=`tty | sed 's|/|_|g'`; for ARGS in "-compression_type=none" "-compression_type=snappy" "-compression_type=zstd" "-compression_type=snappy -verify_compression=1" "-compression_type=zstd -verify_compression=1" "-compression_type=zstd -compression_max_dict_bytes=8180"; do echo $ARGS; (for I in `seq 1 20`; do BIN=/dev/shm/dbbench${SUFFIX}.bin; rm -f $BIN; cp db_bench $BIN; $BIN -db=/dev/shm/dbbench$SUFFIX --benchmarks=fillseq -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=1000 -fifo_compaction_allow_compaction=0 -disable_wal -write_buffer_size=12000000 -format_version=7 $ARGS 2>&1 | grep micros/op; done) | awk '{n++; sum += $5;} END { print int(sum / n); }'; done
```
Ops/sec, Before -> After, both fv=6:
-compression_type=none
1894386 -> 1858403 (-2.0%)
-compression_type=snappy
1859131 -> 1807469 (-2.8%)
-compression_type=zstd
1191428 -> 1214374 (+1.9%)
-compression_type=snappy -verify_compression=1
1861819 -> 1858342 (+0.2%)
-compression_type=zstd -verify_compression=1
979435 -> 995870 (+1.6%)
-compression_type=zstd -compression_max_dict_bytes=8180
905349 -> 940563 (+3.9%)
Ops/sec, Before fv=6 -> After fv=7:
-compression_type=none
1879365 -> 1836159 (-2.3%)
-compression_type=snappy
1865460 -> 1830916 (-1.9%)
-compression_type=zstd
1191428 -> 1210260 (+1.6%)
-compression_type=snappy -verify_compression=1
1866756 -> 1818989 (-2.6%)
-compression_type=zstd -verify_compression=1
982640 -> 997129 (+1.5%)
-compression_type=zstd -compression_max_dict_bytes=8180
912608 -> 937248 (+2.7%)
### SST read performance
Create DBs
```
for COMP in none snappy zstd; do echo $ARGS; ./db_bench -db=/dev/shm/dbbench-7-$COMP --benchmarks=fillseq,flush -num=10000000 -compaction_style=2 -fifo_compaction_max_table_files_size_mb=1000 -fifo_compaction_allow_compaction=0 -disable_wal -write_buffer_size=12000000 -compression_type=$COMP -format_version=7; done
```
And test
```
for COMP in none
snappy zstd none; do echo $COMP; (for I in `seq 1 8`; do ./db_bench -readonly -db=/dev/shm/dbbench
-7-$COMP --benchmarks=readrandom -num=10000000 -duration=20 -threads=8 2>&1 | grep micros/op; done
) | awk '{n++; sum += $5;} END { print int(sum / n); }'; done
```
Ops/sec, Before -> After (both fv=6)
none
1491732 -> 1500209 (+0.6%)
snappy
1157216 -> 1169202 (+1.0%)
zstd
695414 -> 703719 (+1.2%)
none (again)
1491787 -> 1528789 (+2.4%)
Ops/sec, Before fv=6 -> After fv=7:
none
1492278 -> 1508668 (+1.1%)
snappy
1140769 -> 1152613 (+1.0%)
zstd
696437 -> 696511 (+0.0%)
none (again)
1500585 -> 1512037 (+0.7%)
Overall, I think we can take the read CPU improvement in exchange for the hit (in some cases) on background write CPU
Reviewed By: hx235
Differential Revision: D76520739
Pulled By: pdillinger
fbshipit-source-id: e73bd72502ff85c8779cba313f26f7d1fd50be3a
Summary:
add option `block_protection_bytes_per_key` and implementation for block per key-value checksum. The main changes are
1. checksum construction and verification in block.cc/h
2. pass the option `block_protection_bytes_per_key` around (mainly for methods defined in table_cache.h)
3. unit tests/crash test updates
Tests:
* Added unit tests
* Crash test: `python3 tools/db_crashtest.py blackbox --simple --block_protection_bytes_per_key=1 --write_buffer_size=1048576`
Follow up (maybe as a separate PR): make sure corruption status returned from BlockIters are correctly handled.
Performance:
Turning on block per KV protection has a non-trivial negative impact on read performance and costs additional memory.
For memory, each block includes additional 24 bytes for checksum-related states beside checksum itself. For CPU, I set up a DB of size ~1.2GB with 5M keys (32 bytes key and 200 bytes value) which compacts to ~5 SST files (target file size 256 MB) in L6 without compression. I tested readrandom performance with various block cache size (to mimic various cache hit rates):
```
SETUP
make OPTIMIZE_LEVEL="-O3" USE_LTO=1 DEBUG_LEVEL=0 -j32 db_bench
./db_bench -benchmarks=fillseq,compact0,waitforcompaction,compact,waitforcompaction -write_buffer_size=33554432 -level_compaction_dynamic_level_bytes=true -max_background_jobs=8 -target_file_size_base=268435456 --num=5000000 --key_size=32 --value_size=200 --compression_type=none
BENCHMARK
./db_bench --use_existing_db -benchmarks=readtocache,readrandom[-X10] --num=5000000 --key_size=32 --disable_auto_compactions --reads=1000000 --block_protection_bytes_per_key=[0|1] --cache_size=$CACHESIZE
The readrandom ops/sec looks like the following:
Block cache size: 2GB 1.2GB * 0.9 1.2GB * 0.8 1.2GB * 0.5 8MB
Main 240805 223604 198176 161653 139040
PR prot_bytes=0 238691 226693 200127 161082 141153
PR prot_bytes=1 214983 193199 178532 137013 108211
prot_bytes=1 vs -10% -15% -10.8% -15% -23%
prot_bytes=0
```
The benchmark has a lot of variance, but there was a 5% to 25% regression in this benchmark with different cache hit rates.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/11287
Reviewed By: ajkr
Differential Revision: D43970708
Pulled By: cbi42
fbshipit-source-id: ef98d898b71779846fa74212b9ec9e08b7183940
Summary:
Some files miss headers. Also some headers are irregular. Fix them to make an internal checkup tool happy.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10519
Reviewed By: jay-zhuang
Differential Revision: D38603291
fbshipit-source-id: 13b1bbd6d48f5ee15ba20da67544396de48238f1
Summary:
This PR does the following:
- Fix compilation and linking errors when building fuzzer
- Add the above to CircleCI
- Update documentation
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9420
Test Plan: CI
Reviewed By: jay-zhuang
Differential Revision: D33849452
Pulled By: riversand963
fbshipit-source-id: 0794e5d04a3f53bfd2216fe2b3cd827ca2083ac3
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
Summary:
- Added Type/CreateFromString
- Added ability to load EventListeners to DBOptions
- Since EventListeners did not previously have a Name(), defaulted to "". If there is no name, the listener cannot be loaded from the ObjectRegistry.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8473
Reviewed By: zhichao-cao
Differential Revision: D29901488
Pulled By: mrambacher
fbshipit-source-id: 2d3a4aa6db1562ac03e7ad41b360e3521d486254
Summary:
Removed the uses of the Legacy FileWrapper classes from the source code. The wrappers were creating an additional layer of indirection/wrapping, as the Env already has a FileSystem.
Moved the Custom FileWrapper classes into the CustomEnv, as these classes are really for the private use the the CustomEnv class.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7851
Reviewed By: anand1976
Differential Revision: D26114816
Pulled By: mrambacher
fbshipit-source-id: db32840e58d969d3a0fa6c25aaf13d6dcdc74150
Summary:
Execute randomly generated operations on both a DB and a std::map,
then reopen the DB and make sure that iterating the DB produces the
same key-value pairs as iterating through the std::map.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7762
Test Plan: cd fuzz && make db_map_fuzzer && ./db_map_fuzzer
Reviewed By: pdillinger
Differential Revision: D25437485
Pulled By: cheng-chang
fbshipit-source-id: 3a93f7efd046b194193e45d2ab1ad81565510781
Summary:
This PR adds a fuzzer to the project and infrastructure to integrate Rocksdb with OSS-Fuzz. OSS-Fuzz is a service run by Google that performs continuous fuzzing of important open source projects. The LevelDB project is also in being fuzzed by OSS-Fuzz (https://github.com/google/oss-fuzz/tree/master/projects/leveldb). Essentially, OSS-Fuzz will perform the fuzzing for you and email you bug reports, coverage reports etc. All we need is a set of email addresses that will receive this information.
For cross-referencing, the PR that adds the OSS-Fuzz logic is here: https://github.com/google/oss-fuzz/pull/4642
The `db_fuzzer` of the PR performs stateful fuzzing of Rocksdb by calling a sequence of Rockdb's APIs with random input in each fuzz iteration. Each fuzz iteration, thus, creates a new instance of Rocksdb and operates on this given instance. The goal is to test diverse states of Rocksdb and ensure no state lead to error conditions, e.g. memory corruption vulnerabilities.
The fuzzer is similar (although more complex) to the fuzzer that is currently being used to analyse Leveldb (https://github.com/google/oss-fuzz/blob/master/projects/leveldb/fuzz_db.cc)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7674
Reviewed By: pdillinger
Differential Revision: D25238536
Pulled By: cheng-chang
fbshipit-source-id: 610331c49a77eb68d3b1d7d5ef1b0ce230ac0630
Summary:
This is the initial PR to support adding fuzz tests to RocksDB.
It includes the necessary build infrastructure, and includes an example fuzzer.
There is also a README serving as the tutorial for how to add more tests.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7685
Test Plan: Manually build and run the fuzz test according to README.
Reviewed By: pdillinger
Differential Revision: D25013847
Pulled By: cheng-chang
fbshipit-source-id: c91e3b337398d7f4d8f769fd5091cd080487b171
