Summary:
In this PR, `mempurge` is made compatible with the Write Ahead Log: in case of recovery, the DB is now capable of recovering the data that was "mempurged" and kept in the `imm()` list of immutable memtables.
The twist was to add a uint64_t to the `memtable` struct to store the number of the earliest log file containing entries from the `memtable`. When a `Flush` operation is replaced with a `MemPurge`, the `VersionEdit` (which usually contains the new min log file number to pick up for recovery and the level 0 file path of the newly created SST file) is no longer appended to the manifest log, and every time the `deleteWal` method is called, a check is made on the list of immutable memtables.
This PR also includes a unit test that verifies that no data is lost upon Reopening of the database when the mempurge feature is activated. This extensive unit test includes two column families, with valid data contained in the imm() at time of "crash"/reopening (recovery).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8528
Reviewed By: pdillinger
Differential Revision: D29701097
Pulled By: bjlemaire
fbshipit-source-id: 072a900fb6ccc1edcf5eef6caf88f3060238edf9
Summary:
Some bits are mutated and read while holding a lock, other
immutable bits (esp. secondary cache compatibility) can be read by
arbitrary threads without holding a lock. AFAIK, this doesn't cause an
issue on any architecture we care about, because you will get some
legitimate version of the value that includes the initialization, as
long as synchronization guarantees the initialization happens before the
read.
I've only seen this in https://github.com/facebook/rocksdb/issues/8538 so far, but it should be fixed regardless.
Otherwise, we'll surely get these false reports again some time.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8539
Test Plan: some local TSAN test runs and in CircleCI
Reviewed By: zhichao-cao
Differential Revision: D29720262
Pulled By: pdillinger
fbshipit-source-id: 365fd7e565577c648815161f71b339bcb5ce12d5
Summary:
Some cmake and test configuration are set in pre-steps
enviroment variables. Add the missing steps.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8524
Test Plan: CI pass
Reviewed By: siying
Differential Revision: D29682731
Pulled By: jay-zhuang
fbshipit-source-id: afda1acf6a7b76989db450442b0b27f387388b9d
Summary:
The removed function in this PR, just only have declared and dose not have any reference used.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8508
Reviewed By: mrambacher
Differential Revision: D29649033
Pulled By: jay-zhuang
fbshipit-source-id: df98143b73d6c184a2a60c9f7ea2548a065ee35d
Summary:
This PR is for https://github.com/facebook/rocksdb/issues/8453
We need to update `s = biter.status();` when `biter.status().IsIncomplete()` is true. By doing this, can fix the problem in issue.
Besides, we still need to update `db_statistics` in `get_context.ReportCounters()` before return back.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8485
Reviewed By: jay-zhuang
Differential Revision: D29604835
Pulled By: ajkr
fbshipit-source-id: c7f2f1cd058223ce1b507ec05d57cf264b9c9710
Summary:
Fixed a few MSVC (VCToolsVersion=14.0) build errors and warnings
* `DEFINE_string` is a macro and VC compiler complains that it cannot put [ifdef-inside-define](https://stackoverflow.com/questions/5586429/ifdef-inside-define)
* `sleep()` is not a recognizable function. Use `FLAGS_env->SleepForMicroseconds` instead
* Define precise type in comparison to avoid mismatch warning
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8519
Reviewed By: jay-zhuang
Differential Revision: D29683086
fbshipit-source-id: 8c80941472089f8daba84ae29597e75e603850e4
Summary:
Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.7.0 to 2.8.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md">addressable's changelog</a>.</em></p>
<blockquote>
<h1>Addressable 2.8.0</h1>
<ul>
<li>fixes ReDoS vulnerability in Addressable::Template#match</li>
<li>no longer replaces <code>+</code> with spaces in queries for non-http(s) schemes</li>
<li>fixed encoding ipv6 literals</li>
<li>the <code>:compacted</code> flag for <code>normalized_query</code> now dedupes parameters</li>
<li>fix broken <code>escape_component</code> alias</li>
<li>dropping support for Ruby 2.0 and 2.1</li>
<li>adding Ruby 3.0 compatibility for development tasks</li>
<li>drop support for <code>rack-mount</code> and remove Addressable::Template#generate</li>
<li>performance improvements</li>
<li>switch CI/CD to GitHub Actions</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="6469a232c0"><code>6469a23</code></a> Updating gemspec again</li>
<li><a href="24336385de"><code>2433638</code></a> Merge branch 'main' of github.com:sporkmonger/addressable into main</li>
<li><a href="e9c76b8897"><code>e9c76b8</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sporkmonger/addressable/issues/378">https://github.com/facebook/rocksdb/issues/378</a> from ashmaroli/flat-map</li>
<li><a href="56c5cf7ece"><code>56c5cf7</code></a> Update the gemspec</li>
<li><a href="c1fed1ca0a"><code>c1fed1c</code></a> Require a non-vulnerable rake</li>
<li><a href="0d8a3127e3"><code>0d8a312</code></a> Adding note about ReDoS vulnerability</li>
<li><a href="89c76130ce"><code>89c7613</code></a> Merge branch 'template-regexp' into main</li>
<li><a href="cf8884f815"><code>cf8884f</code></a> Note about alias fix</li>
<li><a href="bb03f7112e"><code>bb03f71</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sporkmonger/addressable/issues/371">https://github.com/facebook/rocksdb/issues/371</a> from charleystran/add_missing_encode_component_doc_entry</li>
<li><a href="6d1d8094a6"><code>6d1d809</code></a> Adding note about :compacted normalization</li>
<li>Additional commits viewable in <a href="https://github.com/sporkmonger/addressable/compare/addressable-2.7.0...addressable-2.8.0">compare view</a></li>
</ul>
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Pull Request resolved: https://github.com/facebook/rocksdb/pull/8515
Reviewed By: jay-zhuang
Differential Revision: D29668988
Pulled By: ajkr
fbshipit-source-id: c4b7abd4a879a7b562cb8ba745088dba6644f503
Summary:
MyRocks apparently uses valgrind to check for unreachable
unfreed data, which is stricter than our valgrind checks. Internal ref:
D29257815
This patch adds valgrind support to STATIC_AVOID_DESTRUCTION so that it's
not reported with those stricter checks.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8503
Test Plan:
make valgrind_test
Also, with modified VALGRIND_OPTS (see Makefile), more kinds of
failures seen before than after this commit.
Reviewed By: ajkr, yizhang82
Differential Revision: D29597784
Pulled By: pdillinger
fbshipit-source-id: 360de157a176aec4d1be99ca20d160ecd47c0873
Summary:
1. Fix printing of stats when there are no writes (wamp=0). Previously had a div0 error
2. Added multireadrandom command as a valid target
3. Added ability to pass additional command line options to db_bench. Now can say things like benchmark.sh readrandom --mmap_read and the option will be passed to db_bench.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8346
Reviewed By: zhichao-cao
Differential Revision: D29500436
Pulled By: mrambacher
fbshipit-source-id: 54e90708aae9133be3a903e35efdf8f8abbd86fa
Summary:
The MemPurge output status can either be an Abort if the mempurge is aborted due to the new_mem memtable reaching more than the target capacity (currently 60%), or for other reasons. As a result, in the log, we want to differentiate between an abort status, which in this PR only leads to a ROCKS_LOG_INFO, and any other status, which in this PR leads to a ROCKS_LOG_WARN.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8514
Reviewed By: pdillinger
Differential Revision: D29662446
Pulled By: bjlemaire
fbshipit-source-id: c9bec8e238ebc7ecb14fbbddf580e6887e281c16
Summary:
When db is open as secondary, there are basically 2 step process:
1) Collect column families from wal log
2) Apply changes to Memtable
In case primary db is TransactionDB instance, wal log will contain some additional data, like noop, etc. ColumnFamilyCollector doesn't implement methods to handle these, so it fails to open a wal log written by TransactionDB. (Everything works fine with standard DB::Open).
Memtable recovery process knows how to handle such wal logs, so only missing piece seems to be ColumnFamilyCollector.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8456
Reviewed By: ajkr
Differential Revision: D29455945
Pulled By: mrambacher
fbshipit-source-id: 5b29560fcbc008e17e95d0dc4b07558f3d63e26f
Summary:
In ```DBImpl::WriteImpl()```, we call ```PreprocessWrite()``` which, among other things, checks the BG error and returns it set. This return status is later on passed to ```WriteStatusCheck()```, which calls ```SetBGError()```. This results in a spurious call, and info logs, on every user write request. We should avoid passing the ```PreprocessWrite()``` return status to ```WriteStatusCheck()```, as the former would have called ```SetBGError()``` already if it encountered any new errors, such as error when creating a new WAL file.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8511
Test Plan: Run existing tests
Reviewed By: zhichao-cao
Differential Revision: D29639917
Pulled By: anand1976
fbshipit-source-id: 19234163969e1645dbeb273712aaf5cd9ea2b182
Summary:
In https://github.com/facebook/rocksdb/issues/8454, I introduced a new process baptized `MemPurge` (memtable garbage collection). This new PR is built upon this past mempurge prototype.
In this PR, I made the `mempurge` process a background task, which provides superior performance since the mempurge process does not cling on the db_mutex anymore, and addresses severe restrictions from the past iteration (including a scenario where the past mempurge was failling, when a memtable was mempurged but was still referred to by an iterator/snapshot/...).
Now the mempurge process ressembles an in-memory compaction process: the stack of immutable memtables is filtered out, and the useful payload is used to populate an output memtable. If the output memtable is filled at more than 60% capacity (arbitrary heuristic) the mempurge process is aborted and a regular flush process takes place, else the output memtable is kept in the immutable memtable stack. Note that adding this output memtable to the `imm()` memtable stack does not trigger another flush process, so that the flush thread can go to sleep at the end of a successful mempurge.
MemPurge is activated by making the `experimental_allow_mempurge` flag `true`. When activated, the `MemPurge` process will always happen when the flush reason is `kWriteBufferFull`.
The 3 unit tests confirm that this process supports `Put`, `Get`, `Delete`, `DeleteRange` operators and is compatible with `Iterators` and `CompactionFilters`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8505
Reviewed By: pdillinger
Differential Revision: D29619283
Pulled By: bjlemaire
fbshipit-source-id: 8a99bee76b63a8211bff1a00e0ae32360aaece95
Summary:
Add google benchmark for microbench.
Add ribbon_bench for benchmark ribbon filter vs. other filters.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8493
Test Plan:
added test to CI
To run the benchmark on devhost:
Install benchmark: `$ sudo dnf install google-benchmark-devel`
Build and run:
`$ ROCKSDB_NO_FBCODE=1 DEBUG_LEVEL=0 make microbench`
or with cmake:
`$ mkdir build && cd build && cmake .. -DCMAKE_BUILD_TYPE=Release -DWITH_BENCHMARK=1 && make microbench`
Reviewed By: pdillinger
Differential Revision: D29589649
Pulled By: jay-zhuang
fbshipit-source-id: 8fed13b562bef4472f161ecacec1ab6b18911dff
Summary:
… small overwritten files.
If a file is overwritten with renamed and the parent path is not synced, FaultInjectionTestFS::DeleteFilesCreatedAfterLastDirSync() will delete the file. However, RocksDB relies on file renaming to be atomic no matter whether the parent directory is synced or not, and the current behavior breaks the assumption and caused some false positive: https://github.com/facebook/rocksdb/pull/8489
Since the atomic renaming is used in CURRENT files, to fix the problem, in FaultInjectionTestFS::DeleteFilesCreatedAfterLastDirSync(), we recover the state of overwritten file if the file is small.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8501
Test Plan: Run stress test for a while and see it doesn't break.
Reviewed By: anand1976
Differential Revision: D29594384
fbshipit-source-id: 589b5c2f0a9d2aca53752d7bdb0231efa5b3ae92
Summary:
Various tests had disabled valgrind due to it slowing down and timing
out (as is the case right now) the CI runs. Where a test was disabled with no comment,
I assumed slowness was the cause. For these tests that were slow under
valgrind, as well as the ones identified in https://github.com/facebook/rocksdb/issues/8352, this PR moves them
behind the compiler flag `-DROCKSDB_FULL_VALGRIND_RUN`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8475
Test Plan: running `make full_valgrind_test`, `make valgrind_test`, `make check`; will verify they appear working correctly
Reviewed By: jay-zhuang
Differential Revision: D29504843
Pulled By: ajkr
fbshipit-source-id: 2aac90749cfbd30d5ce11cb29a07a1b9314eeea7
Summary:
Previously, the following command:
```USE_CLANG=1 TEST_TMPDIR=/dev/shm/rocksdb OPT=-g make -j$(nproc) analyze```
was raising an error/warning the new_mem could potentially be a `nullptr`. This error appeared due to code changes from https://github.com/facebook/rocksdb/issues/8454, including an if-statement containing "`... && new_mem != nullptr && ...`", which made the analyzer believe that past this `if`-statement, a `new_mem==nullptr` was a possible scenario.
This code patch simply introduces `assert`s and removes this condition in the `if`-statement.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8492
Reviewed By: jay-zhuang
Differential Revision: D29571275
Pulled By: bjlemaire
fbshipit-source-id: 75d72246b70ebbbae7dea11ccb5778686d8bcbea
Summary:
```TestFSWritableFile``` buffers data in ```Append``` in order to simulate unsynced data loss on crash. This is only required for buffered IO and should be disabled for direct IO. Otherwise, it causes crash tests to assert on the buffer address alignment - ```db_stress: env/io_posix.cc:1194: virtual rocksdb::IOStatus rocksdb::PosixWritableFile::Append(const rocksdb::Slice&, const rocksdb::IOOptions&, rocksdb::IODebugContext*): Assertion `IsSectorAligned(data.data(), GetRequiredBufferAlignment())' failed.```.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8490
Reviewed By: zhichao-cao
Differential Revision: D29565080
Pulled By: anand1976
fbshipit-source-id: 682831fd66ed3b9597caa74fc453e22dfaf9b973
Summary:
Write and metadata error injection during DB open was enabled in https://github.com/facebook/rocksdb/issues/8474. This causes crash tests to fail very frequently due to another fault injection feature that deletes files created after the last dir sync during DB open. In real life, a similar failure would happen if the FS returns error on the CURRENT file rename, but the rename actually succeeded and got partially persisted (dir entry for the old CURRENT file got removed, but the entry for the new one is not persisted). Temporarily disable the fault injection feature until we figure out the likelihood of this bug happening and the proper way to fix it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8489
Test Plan: Stress test can open the DB successfully
Reviewed By: siying
Differential Revision: D29564516
Pulled By: anand1976
fbshipit-source-id: ffd1650715ea3c5bf7131936b0ca6fcf66f4e14e
Summary:
Inject read failures in DB reopen, just as what we do for metadata writes and writes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8476
Test Plan: Some manual tests and make sure failures are triggered.
Reviewed By: anand1976
Differential Revision: D29507283
fbshipit-source-id: d04da0163973447041038bd87701686a417c4e0c
Summary:
We ended up using a different approach for tracking the amount of
garbage in blob files (see e.g. https://github.com/facebook/rocksdb/pull/8450),
so the ability to apply only a range of table property collectors is
now unnecessary. The patch reverts this part of
https://github.com/facebook/rocksdb/pull/8298 while keeping the cleanup done
in that PR.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8465
Test Plan: `make check`
Reviewed By: jay-zhuang
Differential Revision: D29399921
Pulled By: ltamasi
fbshipit-source-id: af64816c357d0829b9d7ba8ca1477038138f6f0a
Summary:
Implement an experimental feature called "MemPurge", which consists in purging "garbage" bytes out of a memtable and reuse the memtable struct instead of making it immutable and eventually flushing its content to storage.
The prototype is by default deactivated and is not intended for use. It is intended for correctness and validation testing. At the moment, the "MemPurge" feature can be switched on by using the `options.experimental_allow_mempurge` flag. For this early stage, when the allow_mempurge flag is set to `true`, all the flush operations will be rerouted to perform a MemPurge. This is a temporary design decision that will give us the time to explore meaningful heuristics to use MemPurge at the right time for relevant workloads . Moreover, the current MemPurge operation only supports `Puts`, `Deletes`, `DeleteRange` operations, and handles `Iterators` as well as `CompactionFilter`s that are invoked at flush time .
Three unit tests are added to `db_flush_test.cc` to test if MemPurge works correctly (and checks that the previously mentioned operations are fully supported thoroughly tested).
One noticeable design decision is the timing of the MemPurge operation in the memtable workflow: for this prototype, the mempurge happens when the memtable is switched (and usually made immutable). This is an inefficient process because it implies that the entirety of the MemPurge operation happens while holding the db_mutex. Future commits will make the MemPurge operation a background task (akin to the regular flush operation) and aim at drastically enhancing the performance of this operation. The MemPurge is also not fully "WAL-compatible" yet, but when the WAL is full, or when the regular MemPurge operation fails (or when the purged memtable still needs to be flushed), a regular flush operation takes place. Later commits will also correct these behaviors.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8454
Reviewed By: anand1976
Differential Revision: D29433971
Pulled By: bjlemaire
fbshipit-source-id: 6af48213554e35048a7e03816955100a80a26dc5
Summary:
add the injest_error_severity to control if it is a retryable IO Error or a fatal or unrecoverable error. Use a flag to indicate, if fatal error comes, the flag is set and db is stopped (but not corrupted).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8479
Test Plan: run ./db_stress --reopen=0 --read_fault_one_in=1000 --write_fault_one_in=5 --disable_wal=true --write_buffer_size=3000000 -writepercent=5 -readpercent=50 --injest_error_severity=2 --column_families=1, make check
Reviewed By: anand1976
Differential Revision: D29524271
Pulled By: zhichao-cao
fbshipit-source-id: 1aa9fb9b5655b0adba6f5ad12005ca8c074c795b
Summary:
Add a new test ```fbcode_crash_test``` to rocksdb-lego-determinator. This test allows the crash test to be run on Facebook Sandcastle infra using fbcode components. Also use the default Env in db_stress to access the expected values path as it requires a memory mapped file and may not work with custom Envs.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8471
Reviewed By: ajkr
Differential Revision: D29474722
Pulled By: anand1976
fbshipit-source-id: 7d086d82dd7091ae48e08cb4ace763ce3e3b87ef
Summary:
Previously Stress can inject metadata write failures when reopening a DB. We extend it to file append too, in the same way.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8474
Test Plan: manually run crash test with various setting and make sure the failures are triggered as expected.
Reviewed By: zhichao-cao
Differential Revision: D29503116
fbshipit-source-id: e73a446e80ccbd09301a579280e56ff949381fab
Summary:
Added the Customizable::ConfigureNewObject method. The method will configure the object if options are found and invoke PrepareOptions if the flag is set properly.
Added tests to test that PrepareOptions is properly called and to test if PrepareOptions fails.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8468
Reviewed By: zhichao-cao
Differential Revision: D29494703
Pulled By: mrambacher
fbshipit-source-id: d5767dee5d7a98620ac66190262101cd0aa9d2b7
Summary:
When the secondary cache lookup fails, we may still allocate a handle and charge the cache for metadata usage. If the cache is full, this can cause the usage to go over capacity. Later, when a (unrelated) handle is released, it trips up an assertion that checks that usage is less than capacity. To prevent this assertion failure, don't charge the cache for a failed secondary cache lookup.
Tests:
Run crash_test
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8470
Reviewed By: zhichao-cao
Differential Revision: D29474713
Pulled By: anand1976
fbshipit-source-id: 27191969c95470a7b070d292b458efce71395bf2
Summary:
Change the job_id for remote compaction interface, which will include
both internal compaction job_id, also a sub_compaction_job_id. It is not
a backward compatible change. The user needs to update interface during
upgrade. (We will avoid backward incompatible change after the feature is
not experimental.)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8364
Reviewed By: ajkr
Differential Revision: D28917301
Pulled By: jay-zhuang
fbshipit-source-id: 6d72a21f652bb517ad6954d0387b496797fc4e11
Summary:
Original author: kraj (https://github.com/facebook/rocksdb/issues/8413)
We have a hack to ensure clang's `posix_memalign()` hack works to be
compatible with glibc's `posix_memalign()` declaration. Our side of the
hack is irrelevant and should be omitted when not using glibc.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8425
Reviewed By: mrambacher
Differential Revision: D29239029
Pulled By: ajkr
fbshipit-source-id: 12b900f50a4823b880a6558f25d8590dbfc0aa26
Summary:
Allow using WindowsThread with Mingw
Most Mingw builds require Posix threads in order to use std::thread.
As per https://github.com/facebook/rocksdb/issues/7764, this is not always the case.
That being considered, we're going to improve the Mingw thread model
checks.
Closes: https://github.com/facebook/rocksdb/issues/7764
Signed-off-by: Lucian Petrut <lpetrut@cloudbasesolutions.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8108
Reviewed By: jay-zhuang
Differential Revision: D27365778
Pulled By: mrambacher
fbshipit-source-id: 2c15b1f04ae90e1e3a25a33e86ceb779224a9529
Summary:
If a Customizable option was not mutable, it would still appear in the list of mutable options when serialized. This meant that when the immutable options were used to configure another immutable object, an "option not changeable" status would be returned.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8457
Reviewed By: zhichao-cao
Differential Revision: D29428298
Pulled By: mrambacher
fbshipit-source-id: 3945b0b822f8e5955a7c5590fe64dfd5bc1fe6a0
Summary:
Added BlobMetaData to ColumnFamilyMetaData and LiveBlobMetaData and DB API GetLiveBlobMetaData to retrieve it.
First pass at struct. More tests and maybe fields to come...
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8273
Reviewed By: ltamasi
Differential Revision: D29102400
Pulled By: mrambacher
fbshipit-source-id: 8a2383a4446328be6b91dced9841fdd3dfc80b73
Summary:
Add a ```-secondary_cache_uri``` to db_stress to allow the user to specify a custom ```SecondaryCache``` object from the object registry. Also allow db_crashtest.py to be run with an alternate db_stress location. Together, these changes will allow us to run db_stress using FB internal components.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/8455
Reviewed By: zhichao-cao
Differential Revision: D29371972
Pulled By: anand1976
fbshipit-source-id: dd1b1fd80ebbedc11aa63d9246ea6ae49edb77c4
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
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