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23 Commits (4da34b97eea94d47c1b5e2b9dd3743b7447955f2)
| Author | SHA1 | Message | Date |
|---|---|---|---|
gitbw95
|
05c678e135 |
Set Write rate limiter priority dynamically and pass it to FS (#9988)
Summary: ### Context: Background compactions and flush generate large reads and writes, and can be long running, especially for universal compaction. In some cases, this can impact foreground reads and writes by users. From the RocksDB perspective, there can be two kinds of rate limiters, the internal (native) one and the external one. - The internal (native) rate limiter is introduced in [the wiki](https://github.com/facebook/rocksdb/wiki/Rate-Limiter). Currently, only IO_LOW and IO_HIGH are used and they are set statically. - For the external rate limiter, in FSWritableFile functions, IOOptions is open for end users to set and get rate_limiter_priority for their own rate limiter. Currently, RocksDB doesn’t pass the rate_limiter_priority through IOOptions to the file system. ### Solution During the User Read, Flush write, Compaction read/write, the WriteController is used to determine whether DB writes are stalled or slowed down. The rate limiter priority (Env::IOPriority) can be determined accordingly. We decided to always pass the priority in IOOptions. What the file system does with it should be a contract between the user and the file system. We would like to set the rate limiter priority at file level, since the Flush/Compaction job level may be too coarse with multiple files and block IO level is too granular. **This PR is for the Write path.** The **Write:** dynamic priority for different state are listed as follows: | State | Normal | Delayed | Stalled | | ----- | ------ | ------- | ------- | | Flush | IO_HIGH | IO_USER | IO_USER | | Compaction | IO_LOW | IO_USER | IO_USER | Flush and Compaction writes share the same call path through BlockBaseTableWriter, WritableFileWriter, and FSWritableFile. When a new FSWritableFile object is created, its io_priority_ can be set dynamically based on the state of the WriteController. In WritableFileWriter, before the call sites of FSWritableFile functions, WritableFileWriter::DecideRateLimiterPriority() determines the rate_limiter_priority. The options (IOOptions) argument of FSWritableFile functions will be updated with the rate_limiter_priority. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9988 Test Plan: Add unit tests. Reviewed By: anand1976 Differential Revision: D36395159 Pulled By: gitbw95 fbshipit-source-id: a7c82fc29759139a1a07ec46c37dbf7e753474cf |
3 years ago |
|
Hui Xiao
|
ca0ef54f16 |
Rate-limit automatic WAL flush after each user write (#9607)
Summary: **Context:** WAL flush is currently not rate-limited by `Options::rate_limiter`. This PR is to provide rate-limiting to auto WAL flush, the one that automatically happen after each user write operation (i.e, `Options::manual_wal_flush == false`), by adding `WriteOptions::rate_limiter_options`. Note that we are NOT rate-limiting WAL flush that do NOT automatically happen after each user write, such as `Options::manual_wal_flush == true + manual FlushWAL()` (rate-limiting multiple WAL flushes), for the benefits of: - being consistent with [ReadOptions::rate_limiter_priority](https://github.com/facebook/rocksdb/blob/7.0.fb/include/rocksdb/options.h#L515) - being able to turn off some WAL flush's rate-limiting but not all (e.g, turn off specific the WAL flush of a critical user write like a service's heartbeat) `WriteOptions::rate_limiter_options` only accept `Env::IO_USER` and `Env::IO_TOTAL` currently due to an implementation constraint. - The constraint is that we currently queue parallel writes (including WAL writes) based on FIFO policy which does not factor rate limiter priority into this layer's scheduling. If we allow lower priorities such as `Env::IO_HIGH/MID/LOW` and such writes specified with lower priorities occurs before ones specified with higher priorities (even just by a tiny bit in arrival time), the former would have blocked the latter, leading to a "priority inversion" issue and contradictory to what we promise for rate-limiting priority. Therefore we only allow `Env::IO_USER` and `Env::IO_TOTAL` right now before improving that scheduling. A pre-requisite to this feature is to support operation-level rate limiting in `WritableFileWriter`, which is also included in this PR. **Summary:** - Renamed test suite `DBRateLimiterTest to DBRateLimiterOnReadTest` for adding a new test suite - Accept `rate_limiter_priority` in `WritableFileWriter`'s private and public write functions - Passed `WriteOptions::rate_limiter_options` to `WritableFileWriter` in the path of automatic WAL flush. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9607 Test Plan: - Added new unit test to verify existing flush/compaction rate-limiting does not break, since `DBTest, RateLimitingTest` is disabled and current db-level rate-limiting tests focus on read only (e.g, `db_rate_limiter_test`, `DBTest2, RateLimitedCompactionReads`). - Added new unit test `DBRateLimiterOnWriteWALTest, AutoWalFlush` - `strace -ftt -e trace=write ./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -rate_limit_auto_wal_flush=1 -rate_limiter_bytes_per_sec=15 -rate_limiter_refill_period_us=1000000 -write_buffer_size=100000000 -disable_auto_compactions=1 -num=100` - verified that WAL flush(i.e, system-call _write_) were chunked into 15 bytes and each _write_ was roughly 1 second apart - verified the chunking disappeared when `-rate_limit_auto_wal_flush=0` - crash test: `python3 tools/db_crashtest.py blackbox --disable_wal=0 --rate_limit_auto_wal_flush=1 --rate_limiter_bytes_per_sec=10485760 --interval=10` killed as normal **Benchmarked on flush/compaction to ensure no performance regression:** - compaction with rate-limiting (see table 1, avg over 1280-run): pre-change: **915635 micros/op**; post-change: **907350 micros/op (improved by 0.106%)** ``` #!/bin/bash TEST_TMPDIR=/dev/shm/testdb START=1 NUM_DATA_ENTRY=8 N=10 rm -f compact_bmk_output.txt compact_bmk_output_2.txt dont_care_output.txt for i in $(eval echo "{$START..$NUM_DATA_ENTRY}") do NUM_RUN=$(($N*(2**($i-1)))) for j in $(eval echo "{$START..$NUM_RUN}") do ./db_bench --benchmarks=fillrandom -db=$TEST_TMPDIR -disable_auto_compactions=1 -write_buffer_size=6710886 > dont_care_output.txt && ./db_bench --benchmarks=compact -use_existing_db=1 -db=$TEST_TMPDIR -level0_file_num_compaction_trigger=1 -rate_limiter_bytes_per_sec=100000000 | egrep 'compact' done > compact_bmk_output.txt && awk -v NUM_RUN=$NUM_RUN '{sum+=$3;sum_sqrt+=$3^2}END{print sum/NUM_RUN, sqrt(sum_sqrt/NUM_RUN-(sum/NUM_RUN)^2)}' compact_bmk_output.txt >> compact_bmk_output_2.txt done ``` - compaction w/o rate-limiting (see table 2, avg over 640-run): pre-change: **822197 micros/op**; post-change: **823148 micros/op (regressed by 0.12%)** ``` Same as above script, except that -rate_limiter_bytes_per_sec=0 ``` - flush with rate-limiting (see table 3, avg over 320-run, run on the [patch]( |
3 years ago |
|
Yanqin Jin
|
dd203ed604 |
Disallow a combination of options (#9348)
Summary: Disallow `immutable_db_opts.use_direct_io_for_flush_and_compaction == true` and `mutable_db_opts.writable_file_max_buffer_size == 0`, since it causes `WritableFileWriter::Append()` to loop forever and does not make much sense in direct IO. This combination of options itself does not make much sense: asking RocksDB to do direct IO but not allowing RocksDB to allocate a buffer. We should detect this false combination and warn user early, no matter whether the application is running on a platform that supports direct IO or not. In the case of platform **not** supporting direct IO, it's ok if the user learns about this and then finds that direct IO is not supported. One tricky thing: the constructor of `WritableFileWriter` is being used in our unit tests, and it's impossible to return status code from constructor. Since we do not throw, I put an assertion for now. Fortunately, the constructor is not exposed to external applications. Closing https://github.com/facebook/rocksdb/issues/7109 Pull Request resolved: https://github.com/facebook/rocksdb/pull/9348 Test Plan: make check Reviewed By: ajkr Differential Revision: D33371924 Pulled By: riversand963 fbshipit-source-id: 2a3701ab541cee23bffda8a36cdf37b2d235edfa |
3 years ago |
|
Yanqin Jin
|
08721293ea |
Fix a bug causing duplicate trailing entries in WritableFile (buffered IO) (#9236)
Summary: `db_stress` is a user of `FaultInjectionTestFS`. After injecting a write error, `db_stress` probabilistically determins data drop (https://github.com/facebook/rocksdb/blob/6.27.fb/db_stress_tool/db_stress_test_base.cc#L2615:L2619). In some of our recent runs of `db_stress`, we found duplicate trailing entries corresponding to file trivial move in the MANIFEST, causing the recovery to fail, because the file move operation is not idempotent: you cannot delete a file from a given level twice. Investigation suggests that data buffering in both `WritableFileWriter` and `FaultInjectionTestFS` may be the root cause. WritableFileWriter buffers data to write in a memory buffer, `WritableFileWriter::buf_`. After each `WriteBuffered()`/`WriteBufferedWithChecksum()` succeeds, the `buf_` is cleared. If the underlying file `WritableFileWriter::writable_file_` is opened in buffered IO mode, then `FaultInjectionTestFS` buffers data written for each file until next file sync. After an injected error, user of `FaultInjectionFS` can choose to drop some or none of previously buffered data. If `db_stress` does not drop any unsynced data, then such data will still exist in the `FaultInjectionTestFS`'s buffer. Existing implementation of `WritableileWriter::WriteBuffered()` does not clear `buf_` if there is an error. This may lead to the data being buffered two copies: one in `WritableFileWriter`, and another in `FaultInjectionTestFS`. We also know that the `WritableFileWriter` of MANIFEST file will close upon an error. During `Close()`, it will flush the content in `buf_`. If no write error is injected to `FaultInjectionTestFS` this time, then we end up with two copies of the data appended to the file. To fix, we clear the `WritableFileWriter::buf_` upon failure as well. We focus this PR on files opened in non-direct mode. This PR includes a unit test to reproduce a case when write error injection to `WritableFile` can cause duplicate trailing entries. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9236 Test Plan: make check Reviewed By: zhichao-cao Differential Revision: D33033984 Pulled By: riversand963 fbshipit-source-id: ebfa5a0db8cbf1ed73100528b34fcba543c5db31 |
3 years ago |
|
Akanksha Mahajan
|
4a7c1dc375 |
Add listener API that notifies on IOError (#9177)
Summary: Add a new API in listener.h that notifies about IOErrors on Read/Write/Append/Flush etc. The API reports about IOStatus, filename, Operation name, offset and length. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9177 Test Plan: Added new unit tests Reviewed By: anand1976 Differential Revision: D32470627 Pulled By: akankshamahajan15 fbshipit-source-id: 189a717033590ae227b3beae8b1e7e185e4cdc12 |
3 years ago |
|
Zhichao Cao
|
699f45049d |
Introduce a mechanism to dump out blocks from block cache and re-insert to secondary cache (#8912)
Summary: Background: Cache warming up will cause potential read performance degradation due to reading blocks from storage to the block cache. Since in production, the workload and access pattern to a certain DB is stable, it is a potential solution to dump out the blocks belonging to a certain DB to persist storage (e.g., to a file) and bulk-load the blocks to Secondary cache before the DB is relaunched. For example, when migrating a DB form host A to host B, it will take a short period of time, the access pattern to blocks in the block cache will not change much. It is efficient to dump out the blocks of certain DB, migrate to the destination host and insert them to the Secondary cache before we relaunch the DB. Design: we introduce the interface of CacheDumpWriter and CacheDumpRead for user to store the blocks dumped out from block cache. RocksDB will encode all the information and send the string to the writer. User can implement their own writer it they want. CacheDumper and CacheLoad are introduced to save the blocks and load the blocks respectively. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8912 Test Plan: add new tests to lru_cache_test and pass make check. Reviewed By: pdillinger Differential Revision: D31452871 Pulled By: zhichao-cao fbshipit-source-id: 11ab4f5d03e383f476947116361d54188d36ec48 |
3 years ago |
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Zhichao Cao
|
a904c62d28 |
Using existing crc32c checksum in checksum handoff for Manifest and WAL (#8412)
Summary: In PR https://github.com/facebook/rocksdb/issues/7523 , checksum handoff is introduced in RocksDB for WAL, Manifest, and SST files. When user enable checksum handoff for a certain type of file, before the data is written to the lower layer storage system, we calculate the checksum (crc32c) of each piece of data and pass the checksum down with the data, such that data verification can be down by the lower layer storage system if it has the capability. However, it cannot cover the whole lifetime of the data in the memory and also it potentially introduces extra checksum calculation overhead. In this PR, we introduce a new interface in WritableFileWriter::Append, which allows the caller be able to pass the data and the checksum (crc32c) together. In this way, WritableFileWriter can directly use the pass-in checksum (crc32c) to generate the checksum of data being passed down to the storage system. It saves the calculation overhead and achieves higher protection coverage. When a new checksum is added with the data, we use Crc32cCombine https://github.com/facebook/rocksdb/issues/8305 to combine the existing checksum and the new checksum. To avoid the segmenting of data by rate-limiter before it is stored, rate-limiter is called enough times to accumulate enough credits for a certain write. This design only support Manifest and WAL which use log_writer in the current stage. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8412 Test Plan: make check, add new testing cases. Reviewed By: anand1976 Differential Revision: D29151545 Pulled By: zhichao-cao fbshipit-source-id: 75e2278c5126cfd58393c67b1efd18dcc7a30772 |
3 years ago |
|
sdong
|
e19908cba6 |
Refactor kill point (#8241)
Summary: Refactor kill point to one single class, rather than several extern variables. The intention was to drop unflushed data before killing to simulate some job, and I tried to a pointer to fault ingestion fs to the killing class, but it ended up with harder than I thought. Perhaps we'll need to do this in another way. But I thought the refactoring itself is good so I send it out. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8241 Test Plan: make release and run crash test for a while. Reviewed By: anand1976 Differential Revision: D28078486 fbshipit-source-id: f9182c1455f52e6851c13f88a21bade63bcec45f |
4 years ago |
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Zhichao Cao
|
d1c510baec |
Handoff checksum Implementation (#7523)
Summary: in PR https://github.com/facebook/rocksdb/issues/7419 , we introduce the new Append and PositionedAppend APIs to WritableFile at File System, which enable RocksDB to pass the data verification information (e.g., checksum of the data) to the lower layer. In this PR, we use the new API in WritableFileWriter, such that the file created via WritableFileWrite can pass the checksum to the storage layer. To control which types file should apply the checksum handoff, we add checksum_handoff_file_types to DBOptions. User can use this option to control which file types (Currently supported file tyes: kLogFile, kTableFile, kDescriptorFile.) should use the new Append and PositionedAppend APIs to handoff the verification information. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7523 Test Plan: add new unit test, pass make check/ make asan_check Reviewed By: pdillinger Differential Revision: D24313271 Pulled By: zhichao-cao fbshipit-source-id: aafd69091ae85c3318e3e17cbb96fe7338da11d0 |
4 years ago |
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mrambacher
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4a09d632c4 |
Remove Legacy and Custom FileWrapper classes from header files (#7851)
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 |
4 years ago |
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mrambacher
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12f1137355 |
Add a SystemClock class to capture the time functions of an Env (#7858)
Summary: Introduces and uses a SystemClock class to RocksDB. This class contains the time-related functions of an Env and these functions can be redirected from the Env to the SystemClock. Many of the places that used an Env (Timer, PerfStepTimer, RepeatableThread, RateLimiter, WriteController) for time-related functions have been changed to use SystemClock instead. There are likely more places that can be changed, but this is a start to show what can/should be done. Over time it would be nice to migrate most (if not all) of the uses of the time functions from the Env to the SystemClock. There are several Env classes that implement these functions. Most of these have not been converted yet to SystemClock implementations; that will come in a subsequent PR. It would be good to unify many of the Mock Timer implementations, so that they behave similarly and be tested similarly (some override Sleep, some use a MockSleep, etc). Additionally, this change will allow new methods to be introduced to the SystemClock (like https://github.com/facebook/rocksdb/issues/7101 WaitFor) in a consistent manner across a smaller number of classes. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7858 Reviewed By: pdillinger Differential Revision: D26006406 Pulled By: mrambacher fbshipit-source-id: ed10a8abbdab7ff2e23d69d85bd25b3e7e899e90 |
4 years ago |
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Akanksha Mahajan
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b175eceb09 |
Store FSWritableFilePtr object in WritableFileWriter (#7193)
Summary:
Replace FSWritableFile pointer with FSWritableFilePtr
object in WritableFileWriter.
This new object wraps FSWritableFile pointer.
Objective: If tracing is enabled, FSWritableFile Ptr returns
FSWritableFileTracingWrapper pointer that includes all necessary
information in IORecord and calls underlying FileSystem and invokes
IOTracer to dump that record in a binary file. If tracing is disabled
then, underlying FileSystem pointer is returned directly.
FSWritableFilePtr wrapper class is added to bypass the
FSWritableFileWrapper when
tracing is disabled.
Test Plan: make check -j64
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7193
Reviewed By: anand1976
Differential Revision: D23355915
Pulled By: akankshamahajan15
fbshipit-source-id: e62a27a13c1fd77e36a6dbafc7006d969bed25cf
|
4 years ago |
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Haosen Wen
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dbc51adbac |
Use steady_clock instead of system_clock in FileOperationInfo::TimePoint (#7153)
Summary: Issue https://github.com/facebook/rocksdb/issues/7133 reported that using `system_clock` in `FileOperationInfo::TimePoint` causes the duration of file flush operation (which can be a noop on MacOS in some scenarios) appears to be 0 and fail an assertion in listener_test. Using `steady_clock` supposedly fixed the problem. `steady_clock` actually fits better into the use cases of `FileOperationInfo::TimePoint` as all usages care about durations but not wall clock time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7153 Test Plan: make check. Reviewed By: riversand963 Differential Revision: D22654136 Pulled By: roghnin fbshipit-source-id: 5980b1080734bdae496a18071a2c2b5887c67d85 |
4 years ago |
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wenh
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226d1f9c73 |
extend listener callback functions to more file I/O operations (#7055)
Summary: Currently, `EventListener` in listner.h only have callback functions for file read and write. One may favor extended callback functions for more file I/O operations like flush, sync and close. This PR tries to add those interface and have them called when appropriate throughout the code base. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7055 Test Plan: Write an experimental listener with those new callback functions with log output in them; run experiments and check logs to see those functions are actually called. Default test suits `make check` should also be included. Reviewed By: riversand963 Differential Revision: D22380624 Pulled By: roghnin fbshipit-source-id: 4121491d45c2c2aae8c255e7998090559a241c6a |
4 years ago |
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Yanqin Jin
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3020df9df5 |
Remove unnecessary inclusion of version_edit.h in env (#6952)
Summary: In db_options.c, we should avoid including header files in the `db` directory to avoid introducing unnecessary dependency. The reason why `version_edit.h` has been included in `db_options.cc` is because we need two constants, `kUnknownChecksum` and `kUnknownChecksumFuncName`. We can put these two constants as `constexpr` in the public header `file_checksum.h`. Test plan (devserver): make check Pull Request resolved: https://github.com/facebook/rocksdb/pull/6952 Reviewed By: zhichao-cao Differential Revision: D21925341 Pulled By: riversand963 fbshipit-source-id: 2902f3b74c97f0cf16c58ad24c095c787c3a40e2 |
5 years ago |
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Peter Dillinger
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c7aedf1b48 |
Clean up some code related to file checksums (#6861)
Summary: * Add missing unit test for schema stability of FileChecksumGenCrc32c (previously was only comparing to itself) * A lot of clarifying comments * Add some assertions for preconditions * Rename WritableFileWriter::CalculateFileChecksum -> UpdateFileChecksum * Simplify FileChecksumGenCrc32c with shared functions * Implement EndianSwapValue to replace unused EndianTransform And incidentally since I had trouble with 'make check-format' GitHub action disagreeing with local run, * Output full diagnostic information when 'make check-format' fails in CI Pull Request resolved: https://github.com/facebook/rocksdb/pull/6861 Test Plan: new unit test passes before & after other changes Reviewed By: zhichao-cao Differential Revision: D21667115 Pulled By: pdillinger fbshipit-source-id: 6a99970f87605aa024fa540c78cd519ff322c3e6 |
5 years ago |
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Zhichao Cao
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06a2dcebea |
Move checksum calculation ahead of memory copy (#6844)
Summary: Originally, the checksum of appended data in writable file writer is calculated after the data is copied to the buffer. It will not be able to catch the bit flip happens during copy. Move the checksum calculation before it. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6844 Test Plan: pass make asan_check Reviewed By: cheng-chang Differential Revision: D21576726 Pulled By: zhichao-cao fbshipit-source-id: 0a062a1f19886f6ea0d4e3f557e6f4b799773254 |
5 years ago |
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Zhichao Cao
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e8d332d97e |
Use FileChecksumGenFactory for SST file checksum (#6600)
Summary: In the current implementation, sst file checksum is calculated by a shared checksum function object, which may make some checksum function hard to be applied here such as SHA1. In this implementation, each sst file will have its own checksum generator obejct, created by FileChecksumGenFactory. User needs to implement its own FilechecksumGenerator and Factory to plugin the in checksum calculation method. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6600 Test Plan: tested with make asan_check Reviewed By: riversand963 Differential Revision: D20717670 Pulled By: zhichao-cao fbshipit-source-id: 2a74c1c280ac11a07a1980185b43b671acaa71c6 |
5 years ago |
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Zhichao Cao
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4246888101 |
Pass IOStatus to write path and set retryable IO Error as hard error in BG jobs (#6487)
Summary: In the current code base, we use Status to get and store the returned status from the call. Specifically, for IO related functions, the current Status cannot reflect the IO Error details such as error scope, error retryable attribute, and others. With the implementation of https://github.com/facebook/rocksdb/issues/5761, we have the new Wrapper for IO, which returns IOStatus instead of Status. However, the IOStatus is purged at the lower level of write path and transferred to Status. The first job of this PR is to pass the IOStatus to the write path (flush, WAL write, and Compaction). The second job is to identify the Retryable IO Error as HardError, and set the bg_error_ as HardError. In this case, the DB Instance becomes read only. User is informed of the Status and need to take actions to deal with it (e.g., call db->Resume()). Pull Request resolved: https://github.com/facebook/rocksdb/pull/6487 Test Plan: Added the testing case to error_handler_fs_test. Pass make asan_check Reviewed By: anand1976 Differential Revision: D20685017 Pulled By: zhichao-cao fbshipit-source-id: ff85f042896243abcd6ef37877834e26f36b6eb0 |
5 years ago |
|
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 |
5 years ago |
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Zhichao Cao
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4369f2c7bb |
Checksum for each SST file and stores in MANIFEST (#6216)
Summary: In the current code base, RocksDB generate the checksum for each block and verify the checksum at usage. Current PR enable SST file checksum. After a SST file is generated by Flush or Compaction, RocksDB generate the SST file checksum and store the checksum value and checksum method name in the vs_info and MANIFEST as part for the FileMetadata. Added the enable_sst_file_checksum to Options to enable or disable file checksum. Added sst_file_checksum to Options such that user can plugin their own SST file checksum calculate method via overriding the SstFileChecksum class. The checksum information inlcuding uint32_t checksum value and a checksum name (string). A new tool is added to LDB such that user can dump out a list of file checksum information from MANIFEST. If user enables the file checksum but does not provide the sst_file_checksum instance, RocksDB will use the default crc32checksum implemented in table/sst_file_checksum_crc32c.h Pull Request resolved: https://github.com/facebook/rocksdb/pull/6216 Test Plan: Added the testing case in table_test and ldb_cmd_test to verify checksum is correct in different level. Pass make asan_check. Differential Revision: D19171461 Pulled By: zhichao-cao fbshipit-source-id: b2e53479eefc5bb0437189eaa1941670e5ba8b87 |
5 years ago |
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anand76
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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 |
5 years ago |
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sdong
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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 |
5 years ago |