Commit Graph

175 Commits

Author SHA1 Message Date
Cheng Chang
0a0151fb99 Remove memcpy from RandomAccessFileReader::Read in direct IO mode (#6455)
Summary:
In direct IO mode, RandomAccessFileReader::Read allocates an internal aligned buffer, and then copies the result into the scratch buffer. If the result is only temporarily used inside a function, there is no need to do the memcpy and just let the result Slice refer to the internally allocated buffer.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6455

Test Plan: make check

Differential Revision: D20106753

Pulled By: cheng-chang

fbshipit-source-id: 44f505843837bba47a56e3fa2c4dd3bd76486b58
2020-03-06 14:05:12 -08:00
Huisheng Liu
904a60ff63 return timestamp from get (#6409)
Summary:
Added new Get() methods that return timestamp. Dummy implementation is given so that classes derived from DB don't need to be touched to provide their implementation. MultiGet is not included.

ReadRandom perf test (10 minutes) on the same development machine ram drive with the same DB data shows no regression (within marge of error). The test is adapted from https://github.com/facebook/rocksdb/wiki/RocksDB-In-Memory-Workload-Performance-Benchmarks.
    base line (commit 72ee067b9):
        101.712 micros/op 314602 ops/sec;   36.0 MB/s (5658999 of 5658999 found)
    This PR:
        100.288 micros/op 319071 ops/sec;   36.5 MB/s (5674999 of 5674999 found)

./db_bench --db=r:\rocksdb.github --num_levels=6 --key_size=20 --prefix_size=20 --keys_per_prefix=0 --value_size=100 --cache_size=2147483648 --cache_numshardbits=6 --compression_type=none --compression_ratio=1 --min_level_to_compress=-1 --disable_seek_compaction=1 --hard_rate_limit=2 --write_buffer_size=134217728 --max_write_buffer_number=2 --level0_file_num_compaction_trigger=8 --target_file_size_base=134217728 --max_bytes_for_level_base=1073741824 --disable_wal=0 --wal_dir=r:\rocksdb.github\WAL_LOG --sync=0 --verify_checksum=1 --delete_obsolete_files_period_micros=314572800 --max_background_compactions=4 --max_background_flushes=0 --level0_slowdown_writes_trigger=16 --level0_stop_writes_trigger=24 --statistics=0 --stats_per_interval=0 --stats_interval=1048576 --histogram=0 --use_plain_table=1 --open_files=-1 --mmap_read=1 --mmap_write=0 --memtablerep=prefix_hash --bloom_bits=10 --bloom_locality=1 --duration=600 --benchmarks=readrandom --use_existing_db=1 --num=25000000 --threads=32
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6409

Differential Revision: D20200086

Pulled By: riversand963

fbshipit-source-id: 490edd74d924f62bd8ae9c29c2a6bbbb8410ca50
2020-03-02 16:01:00 -08:00
Michael R. Crusoe
051696bf98 fix some spelling typos (#6464)
Summary:
Found from Debian's "Lintian" program
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6464

Differential Revision: D20162862

Pulled By: zhichao-cao

fbshipit-source-id: 06941ee2437b038b2b8045becbe9d2c6fbff3e12
2020-02-28 14:14:03 -08:00
sdong
fdf882ded2 Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)
Summary:
When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433

Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag.

Differential Revision: D19977691

fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
2020-02-20 12:09:57 -08:00
Levi Tamasi
1b4be4cac9 BlobDB: ignore trivially moved files when updating the SST<->blob file mapping (#6381)
Summary:
BlobDB keeps track of the mapping between SSTs and blob files using
the `OnFlushCompleted` and `OnCompactionCompleted` callbacks of
the `EventListener` interface: upon receiving a flush notification, a link
is added between the newly flushed SST and the corresponding blob file;
for compactions, links are removed for the inputs and added for the outputs.
The earlier code performed this link deletion and addition even for
trivially moved files; the new code walks through the two lists together
(in a fashion that's similar to merge sort) and skips such files.
This should mitigate https://github.com/facebook/rocksdb/issues/6338,
wherein an assertion is triggered with the earlier code when a compaction
notification for a trivial move precedes the flush notification for the
moved SST.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6381

Test Plan: make check

Differential Revision: D19773729

Pulled By: ltamasi

fbshipit-source-id: ae0f273ded061110dd9334e8fb99b0d7786650b0
2020-02-07 12:50:57 -08:00
Levi Tamasi
9e3ace42a4 Add statistics for BlobDB GC (#6296)
Summary:
The patch adds statistics support to the new BlobDB garbage collection implementation;
namely, it adds support for the following (pre-existing) tickers:

`BLOB_DB_GC_NUM_FILES`: the number of blob files obsoleted by the GC logic.
`BLOB_DB_GC_NUM_NEW_FILES`: the number of new blob files generated by the GC logic.
`BLOB_DB_GC_FAILURES`: the number of failed GC passes (where a GC pass is
equivalent to a (sub)compaction).
`BLOB_DB_GC_NUM_KEYS_RELOCATED`: the number of blobs relocated to new blob
files by the GC logic.
`BLOB_DB_GC_BYTES_RELOCATED`: the total size of blobs relocated to new blob files.

The tickers `BLOB_DB_GC_NUM_KEYS_OVERWRITTEN`, `BLOB_DB_GC_NUM_KEYS_EXPIRED`,
`BLOB_DB_GC_BYTES_OVERWRITTEN`, `BLOB_DB_GC_BYTES_EXPIRED`, and
`BLOB_DB_GC_MICROS` are not relevant for the new GC logic, and are thus marked
deprecated.

The patch also adds a couple of log messages that log the number and total size of
blobs encountered and relocated during a GC pass, as well as the number of blob
files created and obsoleted.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6296

Test Plan: Extended unit tests and used the BlobDB mode of `db_bench`.

Differential Revision: D19402513

Pulled By: ltamasi

fbshipit-source-id: d53d2bfbf4928a1db1e9346c67ebb9007b8932ec
2020-01-29 16:46:16 -08:00
Levi Tamasi
1dd7873e08 Remove earlier partial BlobDB GC implementation (#6278)
Summary:
In addition to removing the earlier partially implemented garbage collection
logic from the BlobDB codebase, the patch also removes the test cases (as well as
the related sync points, as appropriate) that were only relevant for the old
implementation, and reworks the remaining ones so they use the new GC logic.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6278

Test Plan: `make check`

Differential Revision: D19335226

Pulled By: ltamasi

fbshipit-source-id: 0cc1794bc9892feda1426ed5522a318f3cb1b692
2020-01-14 15:08:44 -08:00
sdong
39410bcb3d Fix some shadow warning (#6242)
Summary:
Some shadow warning shows up when using gcc 4.8. An example:

./utilities/blob_db/blob_compaction_filter.h: In constructor ‘rocksdb::blob_db::BlobIndexCompactionFilterFactoryBase::BlobIndexCompactionFilterFactoryBase(rocksdb::blob_db::lobDBImpl*, rocksdb::Env*, rocksdb::Statistics*)’:
./utilities/blob_db/blob_compaction_filter.h:121:7: error: declaration of ‘blob_db_impl’ shadows a member of 'this' [-Werror=shadow]
       : blob_db_impl_(blob_db_impl), env_(_env), statistics_(_statistics) {}
       ^

Fix them.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6242

Test Plan: Build and see the warnings go away.

Differential Revision: D19217789

fbshipit-source-id: 8ef631941f23dab47a388e060adec24b72efd65e
2020-01-08 18:20:13 -08:00
Levi Tamasi
1ebaa762e6 Log garbage_collection_cutoff alongside the other BlobDB options
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/6229

Differential Revision: D19191195

Pulled By: ltamasi

fbshipit-source-id: 2a3c4785299641a46e022fc012460b759a689fce
2019-12-20 11:00:53 -08:00
Levi Tamasi
7a7ca8eb5b BlobDB: only compare CF IDs when checking whether an API call is for the default CF (#6226)
Summary:
BlobDB currently only supports using the default column family. The earlier
code enforces this by comparing the `ColumnFamilyHandle` passed to the
`Get`/`Put`/etc. call with the handle returned by `DefaultColumnFamily`
(which, at the end of the day, comes from `DBImpl::default_cf_handle_`).
Since other `ColumnFamilyHandle`s can also point to the default column
family, this can reject legitimate requests as well. (As an example,
with the earlier code, the handle returned by `BlobDB::Open` cannot
actually be used in API calls.) The patch fixes this by comparing only
the IDs of the column family handles instead of the pointers themselves.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6226

Test Plan: `make check`

Differential Revision: D19187461

Pulled By: ltamasi

fbshipit-source-id: 54ce2e12ebb1f07e6d1e70e3b1e0213dfa94bda2
2019-12-19 18:05:49 -08:00
Levi Tamasi
0d2172f128 Make it possible to enable periodic compactions for BlobDB (#6172)
Summary:
Periodic compactions ensure that even SSTs that do not get picked up
otherwise eventually go through compaction; used in conjunction with
BlobDB's garbage collection, they enable BlobDB to reclaim space when
old blob files are used by such straggling SSTs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6172

Test Plan: Ran `make check` and used the BlobDB mode of `db_bench`.

Differential Revision: D19045045

Pulled By: ltamasi

fbshipit-source-id: 04636ecc4b6cfe8d495bf656faa65d54a5eb1a93
2019-12-13 16:13:25 -08:00
anand76
afa2420c2b 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
2019-12-13 14:48:41 -08:00
Levi Tamasi
583c6953d8 Move out valid blobs from the oldest blob files during compaction (#6121)
Summary:
The patch adds logic that relocates live blobs from the oldest N non-TTL
blob files as they are encountered during compaction (assuming the BlobDB
configuration option `enable_garbage_collection` is `true`), where N is defined
as the number of immutable non-TTL blob files multiplied by the value of
a new BlobDB configuration option called `garbage_collection_cutoff`.
(The default value of this parameter is 0.25, that is, by default the valid blobs
residing in the oldest 25% of immutable non-TTL blob files are relocated.)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6121

Test Plan: Added unit test and tested using the BlobDB mode of `db_bench`.

Differential Revision: D18785357

Pulled By: ltamasi

fbshipit-source-id: 8c21c512a18fba777ec28765c88682bb1a5e694e
2019-12-13 10:13:05 -08:00
Levi Tamasi
3b607610df Do not update SST <-> blob file mapping if compaction failed
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/6156

Test Plan: Extended unit tests.

Differential Revision: D18943867

Pulled By: ltamasi

fbshipit-source-id: b3669d2dd6af08e987ad1a59d6712ae2514da0b1
2019-12-12 11:30:45 -08:00
Adam Retter
a61ec9ae3b Fix BlobDB compilation on older GCC versions
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/6094

Differential Revision: D18731951

Pulled By: ltamasi

fbshipit-source-id: 5b73c6009c748f6a2a48d4d880b1259980d801d4
2019-11-27 13:09:09 -08:00
Levi Tamasi
d9314a9214 Refactor and clean up the code that reads a blob from a file (#6093)
Summary:
This patch factors out the logic that reads a (potentially compressed) blob
from a file into a separate helper method `GetRawBlobFromFile`, and cleans
up the code a bit. Also, errors during decompression are now logged/propagated
to the user by returning a `Status` code of `Corruption`.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/6093

Test Plan: `make check`

Differential Revision: D18716673

Pulled By: ltamasi

fbshipit-source-id: 44144bc064cab616862d5643f34384f2bae6eb78
2019-11-26 16:49:39 -08:00
Levi Tamasi
72daa92d3a Refactor blob file creation logic (#6066)
Summary:
The patch refactors and cleans up the logic around creating new blob files
by moving the common code of `SelectBlobFile` and `SelectBlobFileTTL`
to a new helper method `CreateBlobFileAndWriter`, bringing the implementation
of `SelectBlobFile` and `SelectBlobFileTTL` into sync, and increasing encapsulation
by adding new constructors for `BlobFile` and `BlobLogHeader`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6066

Test Plan:
Ran `make check` and used the BlobDB mode of `db_bench` to sanity test both
the TTL and the non-TTL code paths.

Differential Revision: D18646921

Pulled By: ltamasi

fbshipit-source-id: e5705a84807932e31dccab4f49b3e64369cea26d
2019-11-26 13:28:32 -08:00
Levi Tamasi
279c488395 Mark blob files not needed by any memtables/SSTs obsolete (#6032)
Summary:
The patch adds logic to mark no longer needed blob files obsolete upon database open
and whenever a flush or compaction completes. Unneeded blob files are detected by
iterating through live immutable non-TTL blob files starting from the lowest-numbered one,
and stopping when a blob file used by any SSTs or potentially used by memtables is found.
(The latter is determined by comparing the sequence number at which the blob file
became immutable with the largest sequence number received in flush notifications.)

In addition, the patch cleans up the logic around closing and obsoleting blob files and
enforces invariants around this area (blob files are now guaranteed to go through the
stages mutable-non-obsolete, immutable-non-obsolete, and immutable-obsolete in this
order).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6032

Test Plan: Extended unit tests and tested using the BlobDB mode of `db_bench`.

Differential Revision: D18495610

Pulled By: ltamasi

fbshipit-source-id: 11825b84af74f3f4abfd9bcae04e80870ae58961
2019-11-18 16:30:06 -08:00
Levi Tamasi
8e7aa62813 BlobDB: Maintain mapping between blob files and SSTs (#6020)
Summary:
The patch adds logic to BlobDB to maintain the mapping between blob files
and SSTs for which the blob file in question is the oldest blob file referenced
by the SST file. The mapping is initialized during database open based on the
information retrieved using `GetLiveFilesMetaData`, and updated after
flushes/compactions based on the information received through the `EventListener`
interface (or, in the case of manual compactions issued through the `CompactFiles`
API, the `CompactionJobInfo` object).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6020

Test Plan: Added a unit test; also tested using the BlobDB mode of `db_bench`.

Differential Revision: D18410508

Pulled By: ltamasi

fbshipit-source-id: dd9e778af781cfdb0d7056298c54ba9cebdd54a5
2019-11-11 14:01:34 -08:00
Levi Tamasi
f80050fa8f Add file number/oldest referenced blob file number to {Sst,Live}FileMetaData (#6011)
Summary:
The patch exposes the file numbers of the SSTs as well as the oldest blob
files they contain a reference to through the GetColumnFamilyMetaData/
GetLiveFilesMetaData interface.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6011

Test Plan:
Fixed and extended the existing unit tests. (The earlier ColumnFamilyMetaDataTest
wasn't really testing anything because the generated memtables were never
flushed, so the metadata structure was essentially empty.)

Differential Revision: D18361697

Pulled By: ltamasi

fbshipit-source-id: d5ed1d94ac70858b84393c48711441ddfe1251e9
2019-11-07 14:04:16 -08:00
Sagar Vemuri
4c9aa30a62 Auto enable Periodic Compactions if a Compaction Filter is used (#5865)
Summary:
- Periodic compactions are auto-enabled if a compaction filter or a compaction filter factory is set, in Level Compaction.
- The default value of `periodic_compaction_seconds` is changed to UINT64_MAX, which lets RocksDB auto-tune periodic compactions as needed. An explicit value of 0 will still work as before ie. to disable periodic compactions completely. For now, on seeing a compaction filter along with a UINT64_MAX value for `periodic_compaction_seconds`, RocksDB will make SST files older than 30 days to go through periodic copmactions.

Some RocksDB users make use of compaction filters to control when their data can be deleted, usually with a custom TTL logic. But it is occasionally possible that the compactions get delayed by considerable time due to factors like low writes to a key range, data reaching bottom level, etc before the TTL expiry. Periodic Compactions feature was originally built to help such cases. Now periodic compactions are auto enabled by default when compaction filters or compaction filter factories are used, as it is generally helpful to all cases to collect garbage.

`periodic_compaction_seconds` is set to a large value, 30 days, in `SanitizeOptions` when RocksDB sees that a `compaction_filter` or `compaction_filter_factory` is used.

This is done only for Level Compaction style.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5865

Test Plan:
- Added a new test `DBCompactionTest.LevelPeriodicCompactionWithCompactionFilters` to make sure that `periodic_compaction_seconds` is set if either `compaction_filter` or `compaction_filter_factory` options are set.
- `COMPILE_WITH_ASAN=1 make check`

Differential Revision: D17659180

Pulled By: sagar0

fbshipit-source-id: 4887b9cf2e53cf2dc93a7b658c6b15e1181217ee
2019-10-29 15:05:51 -07:00
Levi Tamasi
a59dc843a4 Move blob_index.h to db/ (#5919)
Summary:
Extracted from PR https://github.com/facebook/rocksdb/issues/5903 for technical reasons.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5919

Test Plan: make check

Differential Revision: D17910132

Pulled By: ltamasi

fbshipit-source-id: 6ecbb8d6e84b2a1d1f28575ad48ac3cc65833eb5
2019-10-14 12:54:05 -07:00
sdong
e8263dbdaa Apply formatter to recent 200+ commits. (#5830)
Summary:
Further apply formatter to more recent commits.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5830

Test Plan: Run all existing tests.

Differential Revision: D17488031

fbshipit-source-id: 137458fd94d56dd271b8b40c522b03036943a2ab
2019-09-20 12:04:26 -07:00
sdong
b931f84e56 Divide file_reader_writer.h and .cc (#5803)
Summary:
file_reader_writer.h and .cc contain several files and helper function, and it's hard to navigate. Separate it to multiple files and put them under file/
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5803

Test Plan: Build whole project using make and cmake.

Differential Revision: D17374550

fbshipit-source-id: 10efca907721e7a78ed25bbf74dc5410dea05987
2019-09-16 10:33:51 -07:00
anand76
83a6a614e9 Refactor ArenaWrappedDBIter into separate files (#5801)
Summary:
Move definition and implementation for ArenaWrappedDBIter into its own .h/.cc files. Also, change inlining of functions to better comply with the Google C++ style guide.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5801

Test Plan: make check

Differential Revision: D17371012

Pulled By: anand1976

fbshipit-source-id: c1361abc2851575111e357a63d88be3b3d6cb341
2019-09-13 13:50:43 -07:00
Shylock Hg
9eb3e1f77d Use delete to disable automatic generated methods. (#5009)
Summary:
Use delete to disable automatic generated methods instead of private, and put the constructor together for more clear.This modification cause the unused field warning, so add unused attribute to disable this warning.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5009

Differential Revision: D17288733

fbshipit-source-id: 8a767ce096f185f1db01bd28fc88fef1cdd921f3
2019-09-11 18:09:00 -07:00
Pratik Dhandharia
1b4c104a67 replace some reinterpret_cast with static_cast_with_check (#5740)
Summary:
This PR focuses on replacing some of the reinterpret_cast<DBImpl*> to static_cast_with_check<DBImpl, DB>.

Files impacted:

./db/db_impl/db_impl_compaction_flush.cc
./db/write_batch.cc
./utilities/blob_db/blob_db_impl.cc
./utilities/transactions/pessimistic_transaction_db.cc
./utilities/transactions/transaction_base.cc
./utilities/transactions/write_prepared_txn_db.cc
./utilities/transactions/write_unprepared_txn_db.cc
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5740

Differential Revision: D17055691

Pulled By: pdhandharia

fbshipit-source-id: 0f8034d1b32eade56e37d59c04b7bf236a81d8e8
2019-08-27 10:59:11 -07:00
Levi Tamasi
0a97125ec0 Fix data races in BlobDB (#5698)
Summary:
Some accesses to blob_files_ and open_ttl_files_ in BlobDBImpl, as well
as to expiration_range_ in BlobFile were not properly synchronized.
The patch fixes this and also makes sure the invariant that obsolete_files_
is a subset of blob_files_ holds even when an attempt to delete an obsolete
blob file fails.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5698

Test Plan:
COMPILE_WITH_TSAN=1 make blob_db_test
gtest-parallel --repeat=1000 ./blob_db_test --gtest_filter="*ShutdownWait*"

The test fails with TSAN errors ~20 times out of 1000 without the patch but
completes successfully 1000 out of 1000 times with the fix.

Differential Revision: D16793235

Pulled By: ltamasi

fbshipit-source-id: 8034b987598d4fdc9f15098d4589cc49cde484e9
2019-08-14 16:10:36 -07:00
Vijay Nadimpalli
d150e01474 New API to get all merge operands for a Key (#5604)
Summary:
This is a new API added to db.h to allow for fetching all merge operands associated with a Key. The main motivation for this API is to support use cases where doing a full online merge is not necessary as it is performance sensitive. Example use-cases:
1. Update subset of columns and read subset of columns -
Imagine a SQL Table, a row is encoded as a K/V pair (as it is done in MyRocks). If there are many columns and users only updated one of them, we can use merge operator to reduce write amplification. While users only read one or two columns in the read query, this feature can avoid a full merging of the whole row, and save some CPU.
2. Updating very few attributes in a value which is a JSON-like document -
Updating one attribute can be done efficiently using merge operator, while reading back one attribute can be done more efficiently if we don't need to do a full merge.
----------------------------------------------------------------------------------------------------
API :
Status GetMergeOperands(
      const ReadOptions& options, ColumnFamilyHandle* column_family,
      const Slice& key, PinnableSlice* merge_operands,
      GetMergeOperandsOptions* get_merge_operands_options,
      int* number_of_operands)

Example usage :
int size = 100;
int number_of_operands = 0;
std::vector<PinnableSlice> values(size);
GetMergeOperandsOptions merge_operands_info;
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k1", values.data(), merge_operands_info, &number_of_operands);

Description :
Returns all the merge operands corresponding to the key. If the number of merge operands in DB is greater than merge_operands_options.expected_max_number_of_operands no merge operands are returned and status is Incomplete. Merge operands returned are in the order of insertion.
merge_operands-> Points to an array of at-least merge_operands_options.expected_max_number_of_operands and the caller is responsible for allocating it. If the status returned is Incomplete then number_of_operands will contain the total number of merge operands found in DB for key.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5604

Test Plan:
Added unit test and perf test in db_bench that can be run using the command:
./db_bench -benchmarks=getmergeoperands --merge_operator=sortlist

Differential Revision: D16657366

Pulled By: vjnadimpalli

fbshipit-source-id: 0faadd752351745224ee12d4ae9ef3cb529951bf
2019-08-06 14:26:44 -07:00
anand76
e0d9d57750 Fix bugs in WAL trash file handling (#5520)
Summary:
1. Cleanup WAL trash files on open
2. Don't apply deletion rate limit if WAL dir is different from db dir
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5520

Test Plan: Add new unit tests and make check

Differential Revision: D16096750

Pulled By: anand1976

fbshipit-source-id: 6f07858ad864b754b711db416f0389c45ede599b
2019-07-06 21:07:32 -07:00
sdong
58c4aee42e TransactionUtil::CheckKey() to skip unnecessary history (#4941)
Summary:
If a memtable definitely covers a key, there isn't a need to check older memtables.
We can skip them by checking the earliest sequence number.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4941

Differential Revision: D13932666

fbshipit-source-id: b9d52f234b8ad9dd3bf6547645cd457175a3ca9b
2019-06-11 11:46:42 -07:00
Zhongyi Xie
d68f9f4580 simplify include directive involving inttypes (#5402)
Summary:
When using `PRIu64` type of printf specifier, current code base does the following:
```
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
#include <inttypes.h>
```
However, this can be simplified to
```
#include <cinttypes>
```
as long as flag `-std=c++11` is used.
This should solve issues like https://github.com/facebook/rocksdb/issues/5159
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5402

Differential Revision: D15701195

Pulled By: miasantreble

fbshipit-source-id: 6dac0a05f52aadb55e9728038599d3d2e4b59d03
2019-06-06 13:56:07 -07:00
Siying Dong
000b9ec217 Move some logging related files to logging/ (#5387)
Summary:
Many logging related source files are under util/. It will be more structured if they are together.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5387

Differential Revision: D15579036

Pulled By: siying

fbshipit-source-id: 3850134ed50b8c0bb40a0c8ae1f184fa4081303f
2019-05-31 17:23:59 -07:00
Vijay Nadimpalli
49c5a12dbe Organizing rocksdb/db directory
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/5390

Differential Revision: D15579388

Pulled By: vjnadimpalli

fbshipit-source-id: 5bfc95e31554b8ff05b97b76d6534113f527f366
2019-05-31 11:57:01 -07:00
Siying Dong
8843129ece Move some memory related files from util/ to memory/ (#5382)
Summary:
Move arena, allocator, and memory tools under util to a separate memory/ directory.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5382

Differential Revision: D15564655

Pulled By: siying

fbshipit-source-id: 9cd6b5d0d3d52b39606e19221fa154596e5852a5
2019-05-30 17:44:09 -07:00
Vijay Nadimpalli
50e470791d Organizing rocksdb/table directory by format
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/5373

Differential Revision: D15559425

Pulled By: vjnadimpalli

fbshipit-source-id: 5d6d6d615582bedd96a4b879bb25d429a6de8b55
2019-05-30 14:51:11 -07:00
Siying Dong
e9e0101ca4 Move test related files under util/ to test_util/ (#5377)
Summary:
There are too many types of files under util/. Some test related files don't belong to there or just are just loosely related. Mo
ve them to a new directory test_util/, so that util/ is cleaner.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5377

Differential Revision: D15551366

Pulled By: siying

fbshipit-source-id: 0f5c8653832354ef8caa31749c0143815d719e2c
2019-05-30 11:25:51 -07:00
Siying Dong
545d206040 Move some file related files outside util/ (#5375)
Summary:
util/ means for lower level libraries, so it's a good idea to move the files which requires knowledge to DB out. Create a file/ and move some files there.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5375

Differential Revision: D15550935

Pulled By: siying

fbshipit-source-id: 61a9715dcde5386eebfb43e93f847bba1ae0d3f2
2019-05-29 20:47:06 -07:00
anand76
fefd4b98c5 Introduce a new MultiGet batching implementation (#5011)
Summary:
This PR introduces a new MultiGet() API, with the underlying implementation grouping keys based on SST file and batching lookups in a file. The reason for the new API is twofold - the definition allows callers to allocate storage for status and values on stack instead of std::vector, as well as return values as PinnableSlices in order to avoid copying, and it keeps the original MultiGet() implementation intact while we experiment with batching.

Batching is useful when there is some spatial locality to the keys being queries, as well as larger batch sizes. The main benefits are due to -
1. Fewer function calls, especially to BlockBasedTableReader::MultiGet() and FullFilterBlockReader::KeysMayMatch()
2. Bloom filter cachelines can be prefetched, hiding the cache miss latency

The next step is to optimize the binary searches in the level_storage_info, index blocks and data blocks, since we could reduce the number of key comparisons if the keys are relatively close to each other. The batching optimizations also need to be extended to other formats, such as PlainTable and filter formats. This also needs to be added to db_stress.

Benchmark results from db_bench for various batch size/locality of reference combinations are given below. Locality was simulated by offsetting the keys in a batch by a stride length. Each SST file is about 8.6MB uncompressed and key/value size is 16/100 uncompressed. To focus on the cpu benefit of batching, the runs were single threaded and bound to the same cpu to eliminate interference from other system events. The results show a 10-25% improvement in micros/op from smaller to larger batch sizes (4 - 32).

Batch   Sizes

1        | 2        | 4         | 8      | 16  | 32

Random pattern (Stride length 0)
4.158 | 4.109 | 4.026 | 4.05 | 4.1 | 4.074        - Get
4.438 | 4.302 | 4.165 | 4.122 | 4.096 | 4.075 - MultiGet (no batching)
4.461 | 4.256 | 4.277 | 4.11 | 4.182 | 4.14        - MultiGet (w/ batching)

Good locality (Stride length 16)
4.048 | 3.659 | 3.248 | 2.99 | 2.84 | 2.753
4.429 | 3.728 | 3.406 | 3.053 | 2.911 | 2.781
4.452 | 3.45 | 2.833 | 2.451 | 2.233 | 2.135

Good locality (Stride length 256)
4.066 | 3.786 | 3.581 | 3.447 | 3.415 | 3.232
4.406 | 4.005 | 3.644 | 3.49 | 3.381 | 3.268
4.393 | 3.649 | 3.186 | 2.882 | 2.676 | 2.62

Medium locality (Stride length 4096)
4.012 | 3.922 | 3.768 | 3.61 | 3.582 | 3.555
4.364 | 4.057 | 3.791 | 3.65 | 3.57 | 3.465
4.479 | 3.758 | 3.316 | 3.077 | 2.959 | 2.891

dbbench command used (on a DB with 4 levels, 12 million keys)-
TEST_TMPDIR=/dev/shm numactl -C 10  ./db_bench.tmp -use_existing_db=true -benchmarks="readseq,multireadrandom" -write_buffer_size=4194304 -target_file_size_base=4194304 -max_bytes_for_level_base=16777216 -num=12000000 -reads=12000000 -duration=90 -threads=1 -compression_type=none -cache_size=4194304000 -batch_size=32 -disable_auto_compactions=true -bloom_bits=10 -cache_index_and_filter_blocks=true -pin_l0_filter_and_index_blocks_in_cache=true -multiread_batched=true -multiread_stride=4
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5011

Differential Revision: D14348703

Pulled By: anand1976

fbshipit-source-id: 774406dab3776d979c809522a67bedac6c17f84b
2019-04-11 14:28:26 -07:00
Adam Simpkins
c06c4c01c5 Fix many bugs in log statement arguments (#5089)
Summary:
Annotate all of the logging functions to inform the compiler that these
use printf-style formatting arguments.  This allows the compiler to emit
warnings if the format arguments are incorrect.

This also fixes many problems reported now that format string checking
is enabled.  Many of these are simply mix-ups in the argument type (e.g,
int vs uint64_t), but in several cases the wrong number of arguments
were being passed in which can cause the code to crash.

The primary motivation for this was to fix the log message in
`DBImpl::SwitchMemtable()` which caused a segfault due to an extra %s
format parameter with no argument supplied.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5089

Differential Revision: D14574795

Pulled By: simpkins

fbshipit-source-id: 0921b03f0743652bf4ae21e414ff54b3bb65422a
2019-04-04 12:12:11 -07:00
anand76
dae3b5545c Smooth the deletion of WAL files (#5116)
Summary:
WAL files are currently not subject to deletion rate limiting by DeleteScheduler. If the size of the WAL files is significant, this can cause a high delete rate on SSDs that may affect other operations. To fix it, force WAL file deletions to go through the SstFileManager. Original PR for this is #2768
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5116

Differential Revision: D14669437

Pulled By: anand1976

fbshipit-source-id: c5f62d0640cebaa1574de841a1d01e4ce2faadf0
2019-03-28 15:17:13 -07:00
Siying Dong
2b4d5ceb47 Remove some "using std::..." from header files. (#5113)
Summary:
The code convention we are following, Google C++ Style, discourage
alias in header files, especially public headers:
https://google.github.io/styleguide/cppguide.html#Aliases
Remove some of them. Might removed some from .cc files as well to be consistent.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5113

Differential Revision: D14633030

Pulled By: siying

fbshipit-source-id: b990edc919d5de60295992284f980195e501d424
2019-03-27 10:28:21 -07:00
Siying Dong
fe2bd190a5 BlobDB::Open() should put all existing trash files to delete scheduler (#5103)
Summary:
Right now, BlobDB::Open() fails to put all trash files to delete scheduler,
which causes some trash files permanently untracked.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5103

Differential Revision: D14606095

Pulled By: siying

fbshipit-source-id: 41a9437a2948abb235c0ed85f9a04612d0e50183
2019-03-26 10:53:19 -07:00
Shobhit Dayal
b45b1cde3e Feature for sampling and reporting compressibility (#4842)
Summary:
This is a feature to sample data-block compressibility and and report them as stats. 1 in N (tunable) blocks is sampled for compressibility using two algorithms:
1. lz4 or snappy for fast compression
2. zstd or zlib for slow but higher compression.

The stats are reported to the caller as raw-bytes and compressed-bytes. The block continues to be compressed for storage using the specified CompressionType.

The db_bench_tool how has a command line option for specifying the sampling rate. It's default value is 0 (no sampling). To test the overhead for a certain value, users can compare the performance of db_bench_tool, varying the sampling rate. It is unlikely to have a noticeable impact for high values like 20.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4842

Differential Revision: D13629011

Pulled By: shobhitdayal

fbshipit-source-id: 14ca668bcab6499b2a1734edf848eb62a4f4fafa
2019-03-18 12:15:34 -07:00
He Zhe
20d49da90c utilities: Fix build failure with -Werror=maybe-uninitialized (#5074)
Summary:
Initialize magic_number to zero to avoid such failure.
utilities/blob_db/blob_log_format.cc:91:3: error: 'magic_number' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   if (magic_number != kMagicNumber) {
   ^~

Signed-off-by: He Zhe <zhe.he@windriver.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5074

Differential Revision: D14505514

Pulled By: miasantreble

fbshipit-source-id: 4334462958c2b9c5a7c68c6ab24dadf94ad70902
2019-03-18 11:35:06 -07:00
Levi Tamasi
79b6ab43ce BlobDB: Remove GC interval option (#5044)
Summary:
Remove BlobDBOptions.garbage_collection_interval_secs for now, since
garbage collection is not yet implemented in BlobDB.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5044

Differential Revision: D14354046

Pulled By: ltamasi

fbshipit-source-id: 2b966b6d1e088ba9462f3ea73e115013562fbc04
2019-03-07 10:19:05 -08:00
Siying Dong
5e298f865b Add two more StatsLevel (#5027)
Summary:
Statistics cost too much CPU for some use cases. Add two stats levels
so that people can choose to skip two types of expensive stats, timers and
histograms.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5027

Differential Revision: D14252765

Pulled By: siying

fbshipit-source-id: 75ecec9eaa44c06118229df4f80c366115346592
2019-02-28 10:27:59 -08:00
Siying Dong
06f378d75e When closing BlobDB, should first wait for all background tasks (#5005)
Summary:
When closing a BlobDB, it only waits for background tasks
to finish as the last thing, but the background task may access
some variables that are destroyed. The fix is to introduce a
shutdown function in the timer queue and call the function as
the first thing when destorying BlobDB.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5005

Differential Revision: D14170342

Pulled By: siying

fbshipit-source-id: 081e6a2d99b9765d5956cf6cdfc290c07270c233
2019-02-21 17:26:01 -08:00
Michael Liu
ca89ac2ba9 Apply modernize-use-override (2nd iteration)
Summary:
Use C++11’s override and remove virtual where applicable.
Change are automatically generated.

Reviewed By: Orvid

Differential Revision: D14090024

fbshipit-source-id: 1e9432e87d2657e1ff0028e15370a85d1739ba2a
2019-02-14 14:41:36 -08:00
anand76
d0d484b132 Always delete Blob DB files in the background (#4928)
Summary:
Blob DB files are not tracked by the SFM, so they currently don't get
deleted in the background. Force them to be deleted in background so
rate limiting can be applied
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4928

Differential Revision: D13854649

Pulled By: anand1976

fbshipit-source-id: 8031ce66842ff0af440c715d886b377983dad7d8
2019-01-29 15:50:03 -08:00