Summary:
This PR solves the problem discussed in https://github.com/facebook/rocksdb/issues/7149. By storing the pointer of InternalKeyComparator as icmp_ in BlockIter, the object size remains the same. And for each call to CompareCurrentKey, there is no need to create Comparator objects. One can use icmp_ directly or use the "user_comparator" from the icmp_.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9611
Test Plan:
with https://github.com/facebook/rocksdb/issues/9903,
```
$ TEST_TMPDIR=/dev/shm python3.6 ../benchmark/tools/compare.py benchmarks ./db_basic_bench ../rocksdb-pr9611/db_basic_bench --benchmark_filter=DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1 --benchmark_repetitions=50
...
Comparing ./db_basic_bench to ../rocksdb-pr9611/db_basic_bench
Benchmark Time CPU Time Old Time New CPU Old CPU New
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
...
DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1_pvalue 0.0001 0.0001 U Test, Repetitions: 50 vs 50
DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1_mean -0.0483 -0.0483 3924 3734 3924 3734
DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1_median -0.0713 -0.0713 3971 3687 3970 3687
DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1_stddev -0.0342 -0.0344 225 217 225 217
DBGet/comp_style:0/max_data:134217728/per_key_size:256/enable_statistics:0/negative_query:0/enable_filter:0/mmap:1/iterations:262144/threads:1_cv +0.0148 +0.0146 0 0 0 0
OVERALL_GEOMEAN -0.0483 -0.0483 0 0 0 0
```
Reviewed By: akankshamahajan15
Differential Revision: D35882037
Pulled By: ajkr
fbshipit-source-id: 9e5337bbad8f1239dff7aa9f6549020d599bfcdf
Summary:
It confused users and use that with options.allow_mmap_reads = true, CPU is high with checksum verification. Add a comment to explain it.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9936
Reviewed By: anand1976
Differential Revision: D36106529
fbshipit-source-id: 3d723bd686f96a84c694c8b2d91ad28d9ccfd979
Summary:
Use `unique_ptr<DB>` to make sure the DB object is deleted. Previously it was not, which led to accumulating file descriptors for deleted directories because a `DBImpl::db_dir_` from each test remained alive.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9939
Test Plan: run `lsof -p $(pidof db_basic_bench)` while benchmark runs; verify no FDs for deleted directories.
Reviewed By: jay-zhuang
Differential Revision: D36108761
Pulled By: ajkr
fbshipit-source-id: cfe02646b038a445af7d5db8989eb1f40d658359
Summary:
To support a project to prototype and evaluate algorithmic
enhancments and alternatives to LRUCache, here I have separated out
LRUCache into internal-only "FastLRUCache" and cut it down to
essentials, so that details like secondary cache handling and
priorities do not interfere with prototyping. These can be
re-integrated later as needed, along with refactoring to minimize code
duplication (which would slow down prototyping for now).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9917
Test Plan:
unit tests updated to ensure basic functionality has (likely)
been preserved
Reviewed By: anand1976
Differential Revision: D35995554
Pulled By: pdillinger
fbshipit-source-id: d67b20b7ada3b5d3bfe56d897a73885894a1d9db
Summary:
When compaction filter determines that a key should be removed, it updates the internal key's type
to `Delete`. If this internal key is preserved in current compaction but seen by a later compaction
together with `SingleDelete`, it will cause compaction iterator to return Corruption.
To fix the issue, compaction filter should return more information in addition to the intention of removing
a key. Therefore, we add a new `kRemoveWithSingleDelete` to `CompactionFilter::Decision`. Seeing
`kRemoveWithSingleDelete`, compaction iterator will update the op type of the internal key to `kTypeSingleDelete`.
In addition, I updated db_stress_shared_state.[cc|h] so that `no_overwrite_ids_` becomes `const`. It is easier to
reason about thread-safety if accessed from multiple threads. This information is passed to `PrepareTxnDBOptions()`
when calling from `Open()` so that we can set up the rollback deletion type callback for transactions.
Finally, disable compaction filter for multiops_txn because the key removal logic of `DbStressCompactionFilter` does
not quite work with `MultiOpsTxnsStressTest`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9929
Test Plan:
make check
make crash_test
make crash_test_with_txn
Reviewed By: anand1976
Differential Revision: D36069678
Pulled By: riversand963
fbshipit-source-id: cedd2f1ba958af59ad3916f1ba6f424307955f92
Summary:
`VerifyChecksum()` does not specify `largest_seqno` when creating a `TableReader`. As a result, the `TableReader` uses the `TableReaderOptions` default value (0) for `largest_seqno`. This causes the following error when the file has a nonzero global seqno in its properties:
```
Corruption: An external sst file with version 2 have global seqno property with value , while largest seqno in the file is 0
```
This PR fixes this by specifying `largest_seqno` in `VerifyChecksumInternal` with `largest_seqno` from the file metadata.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9919
Test Plan: `make check`
Reviewed By: ajkr
Differential Revision: D36028824
Pulled By: cbi42
fbshipit-source-id: 428d028a79386f46ef97bb6b6051dc76c83e1f2b
Summary:
Enforce the contract of SingleDelete so that they are not mixed with
Delete for the same key. Otherwise, it will lead to undefined behavior.
See https://github.com/facebook/rocksdb/wiki/Single-Delete#notes.
Also fix unit tests and write-unprepared.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9888
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D35837817
Pulled By: riversand963
fbshipit-source-id: acd06e4dcba8cb18df92b44ed18c57e10e5a7635
Summary:
Adds more coverage to `MultiOpsTxnsStressTest` with a focus on write-prepared transactions.
1. Add a hack to manually evict commit cache entries. We currently cannot assign small values to `wp_commit_cache_bits` because it requires a prepared transaction to commit within a certain range of sequence numbers, otherwise it will throw.
2. Add coverage for commit-time-write-batch. If write policy is write-prepared, we need to set `use_only_the_last_commit_time_batch_for_recovery` to true.
3. After each flush/compaction, verify data consistency. This is possible since data size can be small: default numbers of primary/secondary keys are just 1000.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9829
Test Plan:
```
TEST_TMPDIR=/dev/shm/rocksdb_crashtest_blackbox/ make blackbox_crash_test_with_multiops_wp_txn
```
Reviewed By: pdillinger
Differential Revision: D35806678
Pulled By: riversand963
fbshipit-source-id: d7fde7a29fda0fb481a61f553e0ca0c47da93616
Summary:
The current locktree implementation stores the address of the
PessimisticTransactions object as the TXNID. However, when a transaction
is blocked on a lock, it records the list of waitees with conflicting
locks using the rocksdb assigned TransactionID. This is performed by
calling GetID() on PessimisticTransactions objects of the waitees,
and then recorded in the waiter's list.
However, there is no guarantee the objects are valid when recording the
waitee list during the conflict callbacks because the waitee
could have released the lock and freed the PessimisticTransactions
object.
The waitee/txnid values are only valid PessimisticTransaction objects
while the mutex for the root of the locktree is held.
The simplest fix for this problem is to use the address of the
PessimisticTransaction as the TransactionID so that it is consistent
with its usage in the locktree. The TXNID is only converted back to a
PessimisticTransaction for the report_wait callbacks. Since
these callbacks are now all made within the critical section where the
lock_request queue mutx is held, these conversions will be safe.
Otherwise, only the uint64_t TXNID of the waitee is registerd
with the waiter transaction. The PessimisitcTransaction object of the
waitee is never referenced.
The main downside of this approach is the TransactionID will not change
if the PessimisticTransaction object is reused for new transactions.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9898
Test Plan:
Add a new test case and run unit tests.
Also verified with MyRocks workloads using range locks that the
crash no longer happens.
Reviewed By: riversand963
Differential Revision: D35950376
Pulled By: hermanlee
fbshipit-source-id: 8c9cae272e23e487fc139b6a8ed5b8f8f24b1570
Summary:
When MultiGet() determines that multiple query keys can be
served by examining the same data block in block cache (one Lookup()),
each PinnableSlice referring to data in that data block needs to hold
on to the block in cache so that they can be released at arbitrary
times by the API user. Historically this is accomplished with extra
calls to Ref() on the Handle from Lookup(), with each PinnableSlice
cleanup calling Release() on the Handle, but this creates extra
contention on the block cache for the extra Ref()s and Release()es,
especially because they hit the same cache shard repeatedly.
In the case of merge operands (possibly more cases?), the problem was
compounded by doing an extra Ref()+eventual Release() for each merge
operand for a key reusing a block (which could be the same key!), rather
than one Ref() per key. (Note: the non-shared case with `biter` was
already one per key.)
This change optimizes MultiGet not to rely on these extra, contentious
Ref()+Release() calls by instead, in the shared block case, wrapping
the cache Release() cleanup in a refcounted object referenced by the
PinnableSlices, such that after the last wrapped reference is released,
the cache entry is Release()ed. Relaxed atomic refcounts should be
much faster than mutex-guarded Ref() and Release(), and much less prone
to a performance cliff when MultiGet() does a lot of block sharing.
Note that I did not use std::shared_ptr, because that would require an
extra indirection object (shared_ptr itself new/delete) in order to
associate a ref increment/decrement with a Cleanable cleanup entry. (If
I assumed it was the size of two pointers, I could do some hackery to
make it work without the extra indirection, but that's too fragile.)
Some details:
* Fixed (removed) extra block cache tracing entries in cases of cache
entry reuse in MultiGet, but it's likely that in some other cases traces
are missing (XXX comment inserted)
* Moved existing implementations for cleanable.h from iterator.cc to
new cleanable.cc
* Improved API comments on Cleanable
* Added a public SharedCleanablePtr class to cleanable.h in case others
could benefit from the same pattern (potentially many Cleanables and/or
smart pointers referencing a shared Cleanable)
* Add a typedef for MultiGetContext::Mask
* Some variable renaming for clarity
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9899
Test Plan:
Added unit tests for SharedCleanablePtr.
Greatly enhanced ability of existing tests to detect cache use-after-free.
* Release PinnableSlices from MultiGet as they are read rather than in
bulk (in db_test_util wrapper).
* In ASAN build, default to using a trivially small LRUCache for block_cache
so that entries are immediately erased when unreferenced. (Updated two
tests that depend on caching.) New ASAN testsuite running time seems
OK to me.
If I introduce a bug into my implementation where we skip the shared
cleanups on block reuse, ASAN detects the bug in
`db_basic_test *MultiGet*`. If I remove either of the above testing
enhancements, the bug is not detected.
Consider for follow-up work: manipulate or randomize ordering of
PinnableSlice use and release from MultiGet db_test_util wrapper. But in
typical cases, natural ordering gives pretty good functional coverage.
Performance test:
In the extreme (but possible) case of MultiGetting the same or adjacent keys
in a batch, throughput can improve by an order of magnitude.
`./db_bench -benchmarks=multireadrandom -db=/dev/shm/testdb -readonly -num=5 -duration=10 -threads=20 -multiread_batched -batch_size=200`
Before ops/sec, num=5: 1,384,394
Before ops/sec, num=500: 6,423,720
After ops/sec, num=500: 10,658,794
After ops/sec, num=5: 16,027,257
Also note that previously, with high parallelism, having query keys
concentrated in a single block was worse than spreading them out a bit. Now
concentrated in a single block is faster than spread out, which is hopefully
consistent with natural expectation.
Random query performance: with num=1000000, over 999 x 10s runs running before & after simultaneously (each -threads=12):
Before: multireadrandom [AVG 999 runs] : 1088699 (± 7344) ops/sec; 120.4 (± 0.8 ) MB/sec
After: multireadrandom [AVG 999 runs] : 1090402 (± 7230) ops/sec; 120.6 (± 0.8 ) MB/sec
Possibly better, possibly in the noise.
Reviewed By: anand1976
Differential Revision: D35907003
Pulled By: pdillinger
fbshipit-source-id: bbd244d703649a8ca12d476f2d03853ed9d1a17e
Summary:
I tried evaluating https://github.com/facebook/rocksdb/issues/9611 using DBGet microbenchmarks but mostly found the change is well within the noise even for hundreds of repetitions; meanwhile, the InternalKeyComparator CPU it saves is 1-2% according to perf so it should be measurable. In this PR I tried adding a mmap mode that will bypass compression/checksum/block cache/file read to focus more on the block lookup paths, and also increased the Get() count.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9903
Reviewed By: jay-zhuang, riversand963
Differential Revision: D35907375
Pulled By: ajkr
fbshipit-source-id: 69490d5040ef0863e1ce296724104d0aa7667215
Summary:
Left HISTORY.md and unit tests.
Added a new unit test to repro the corruption scenario that this PR fixes, and HISTORY.md line for that.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9906
Reviewed By: riversand963
Differential Revision: D35940093
Pulled By: ajkr
fbshipit-source-id: 9816f99e1ce405ba36f316beb4f6378c37c8c86b
Summary:
Add stats PREFETCHED_BYTES_DISCARDED and POLL_WAIT_MICROS.
PREFETCHED_BYTES_DISCARDED records number of prefetched bytes discarded by
FilePrefetchBuffer. POLL_WAIT_MICROS records the time taken by underling
file_system Poll API.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9845
Test Plan: Update existing tests
Reviewed By: anand1976
Differential Revision: D35909694
Pulled By: akankshamahajan15
fbshipit-source-id: e009ef940bb9ed72c9446f5529095caabb8a1e36
Summary:
This patch completes the second part of the task: "Add blob support to the dump and dump_live_files command"
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9896
Reviewed By: ltamasi
Differential Revision: D35852667
Pulled By: jowlyzhang
fbshipit-source-id: a006456c881f468a92da689e895134762e9574e1
Summary:
This patch is the first part of adding blob dump support. It only adds blob dump support to the dump command. A follow up patch will add blob dump support to the dump_live_files command.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9881
Reviewed By: ltamasi
Differential Revision: D35796731
Pulled By: jowlyzhang
fbshipit-source-id: 2cc5973b222d505a331ac7b969edcf992b47c5ee
Summary:
This PR does not affect write-committed.
Add a member, `rollback_deletion_type_callback` to TransactionDBOptions
so that a write-prepared transaction, when rolling back, can call this
callback to decide if a `Delete` or `SingleDelete` should be used to
cancel a prior `Put` written to the database during prepare phase.
The purpose of this PR is to prevent mixing `Delete` and `SingleDelete`
for the same key, causing undefined behaviors. Without this PR, the
following can happen:
```
// The application always issues SingleDelete when deleting keys.
txn1->Put('a');
txn1->Prepare(); // writes to memtable and potentially gets flushed/compacted to Lmax
txn1->Rollback(); // inserts DELETE('a')
txn2->Put('a');
txn2->Commit(); // writes to memtable and potentially gets flushed/compacted
```
In the database, we may have
```
L0: [PUT('a', s=100)]
L1: [DELETE('a', s=90)]
Lmax: [PUT('a', s=0)]
```
If a compaction compacts L0 and L1, then we have
```
L1: [PUT('a', s=100)]
Lmax: [PUT('a', s=0)]
```
If a future transaction issues a SingleDelete, we have
```
L0: [SD('a', s=110)]
L1: [PUT('a', s=100)]
Lmax: [PUT('a', s=0)]
```
Then, a compaction including L0, L1 and Lmax leads to
```
Lmax: [PUT('a', s=0)]
```
which is incorrect.
Similar bugs reported and addressed in
https://github.com/cockroachdb/pebble/issues/1255. Based on our team's
current priority, we have decided to take this approach for now. We may
come back and revisit in the future.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9873
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D35762170
Pulled By: riversand963
fbshipit-source-id: b28d56eefc786b53c9844b9ef4a7807acdd82c8d
Summary:
... by filling out remaining testing hole: handling of
db_pathsi+cf_paths. (Note that while GetLiveFilesStorageInfo works
with db_paths / cf_paths, Checkpoint and BackupEngine do not and
are marked appropriately.)
Also improved comments for "live files" APIs, and grouped them
together in db.h.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9868
Test Plan: Adding to existing unit tests
Reviewed By: jay-zhuang
Differential Revision: D35752254
Pulled By: pdillinger
fbshipit-source-id: c70eb67748fad61826e2f554b674638700abefb2
Summary:
This patch completes the first part of the task: "Extend all three commands so they can decode and print blob references if a new option --decode_blob_index is specified"
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9870
Reviewed By: ltamasi
Differential Revision: D35753932
Pulled By: jowlyzhang
fbshipit-source-id: 9d2bbba0eef2ed86b982767eba9de1b4881f35c9
Summary:
We don't really have a mechanism for internal-only release
notes, so adding this to the standard release notes. For picking into
7.2 release.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9872
Test Plan: release note only
Reviewed By: jay-zhuang
Differential Revision: D35761307
Pulled By: pdillinger
fbshipit-source-id: 5d1932767fff48456323df948604dbb956ac27b2
Summary:
This allows to set with true the field `strict_capacity_limit` from C
API and other languages that wrap that.
Signed-off-by: Federico Guerinoni <guerinoni.federico@gmail.com>
Closes: https://github.com/facebook/rocksdb/issues/9707
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9855
Reviewed By: ajkr
Differential Revision: D35724150
Pulled By: jay-zhuang
fbshipit-source-id: d8514797e9d90b1cd88329018f9ac4776722aa0f
Summary:
`InitializeOptionsGeneral()` was overwriting many options that were already configured by OPTIONS file, potentially with the flag default values. This PR changes that function to only overwrite options in limited scenarios, as described at the top of its definition. Block cache is still a violation.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9862
Test Plan: ran under various scenarios (multi-DB, single DB, OPTIONS file, flags) and verified options are set as expected
Reviewed By: jay-zhuang
Differential Revision: D35736960
Pulled By: ajkr
fbshipit-source-id: 75b77740af37e6f5741618f8a8f5685df2417d03
Summary:
* Add valgrind test to nightly CircleCI (in case it can catch something that
ASAN/UBSAN does not)
* Add clang13+asan+ubsan+folly test to nightly CircleCI, for broader testing
* Consolidate many copies of ASAN_OPTIONS= while also allowing it to be
inherited from parent environment rather than always overridden.
* Move UBSAN exclusion from Makefile into options_settable_test.cc
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9859
Test Plan: CI
Reviewed By: jay-zhuang
Differential Revision: D35730903
Pulled By: pdillinger
fbshipit-source-id: 6f5464034e8115f9a07f6f7aec1de9219ec2837c
Summary:
Context:
As mentioned in https://github.com/facebook/rocksdb/issues/9701, we have the following in LITE=1 make static_lib for v7.0.2
```
CC file/sequence_file_reader.o
CC file/sst_file_manager_impl.o
CC file/writable_file_writer.o
In file included from file/writable_file_writer.cc:10:
./file/writable_file_writer.h:163:15: error: private field 'temperature_' is not used [-Werror,-Wunused-private-field]
Temperature temperature_;
^
1 error generated.
make: *** [file/writable_file_writer.o] Error 1
```
as titled
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9854
Test Plan:
- Local `LITE=1 make static_lib` reveals the same error and error is gone after this fix
- CI
Reviewed By: ajkr, jay-zhuang
Differential Revision: D35706585
Pulled By: hx235
fbshipit-source-id: 7743310298231ad6866304ffa2225c8abdc91d9a
Summary:
Since they operate at distinct abstraction layers, I thought it
was prudent to combine with EncryptedEnv CI test for each PR, for efficiency
in testing. Also added supported compressions to sst_dump --help output
so that CI job can verify no compiled-in compression support.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9850
Test Plan: CI, some manual stuff
Reviewed By: riversand963
Differential Revision: D35682346
Pulled By: pdillinger
fbshipit-source-id: be9879c1533fed304ee32c89fd9ba4b07c2b90cc
Summary:
Add a merge operator that allows users to register specific aggregation function so that they can does aggregation based per key using different aggregation types.
See comments of function CreateAggMergeOperator() for actual usage.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9780
Test Plan: Add a unit test to coverage various cases.
Reviewed By: ltamasi
Differential Revision: D35267444
fbshipit-source-id: 5b02f31c4f3e17e96dd4025cdc49fca8c2868628
Summary:
In `FileMetaData`, we keep track of the lowest-numbered blob file
referenced by the SST file in question for the purposes of BlobDB's
garbage collection in the `oldest_blob_file_number` field, which is
updated in `UpdateBoundaries`. However, with the current code,
`BlobIndex` decoding errors (or invalid blob file numbers) are swallowed
in this method. The patch changes this by propagating these errors
and failing the corresponding flush/compaction. (Note that since blob
references are generated by the BlobDB code and also parsed by
`CompactionIterator`, in reality this can only happen in the case of
memory corruption.)
This change necessitated updating some unit tests that involved
fake/corrupt `BlobIndex` objects. Some of these just used a dummy string like
`"blob_index"` as a placeholder; these were replaced with real `BlobIndex`es.
Some were relying on the earlier behavior to simulate corruption; these
were replaced with `SyncPoint`-based test code that corrupts a valid
blob reference at read time.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9851
Test Plan: `make check`
Reviewed By: riversand963
Differential Revision: D35683671
Pulled By: ltamasi
fbshipit-source-id: f7387af9945c48e4d5c4cd864f1ba425c7ad51f6
Summary:
This new options allows application to specify that files must be
ingested to bottommost level, otherwise the ingestion will fail instead
of silently ingesting to a non-bottommost level.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9849
Test Plan: make check
Reviewed By: ajkr
Differential Revision: D35680307
Pulled By: riversand963
fbshipit-source-id: 01cf54ef6c76198f7654dc06b5544631dea1be1e
Summary:
It's to support Meta's internal environment platform010. Gcc still doesn't work but USE_CLANG=1 should work.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9843
Test Plan: Try to make and ROCKSDB_FBCODE_BUILD_WITH_PLATFORM010=1 USE_CLANG=1 make
Reviewed By: pdillinger
Differential Revision: D35652507
fbshipit-source-id: a4a14b2fa4a2d6ca6fbf1b65060e81c39f079363
Summary:
The P95 and P99 metrics are flaky, similar to DBGet ones which removed
in https://github.com/facebook/rocksdb/issues/9742 .
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9844
Test Plan: `$ ./buckifier/buckify_rocksdb.py`
Reviewed By: ajkr
Differential Revision: D35655531
Pulled By: jay-zhuang
fbshipit-source-id: c1409f0fba4e23d461a65f988c27ac5e2ae85d13
Summary:
This change only add decode blob index support to dump_live_files command, which is part of a task to add blob support to a few commands.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9842
Reviewed By: ltamasi
Differential Revision: D35650167
Pulled By: jowlyzhang
fbshipit-source-id: a78151b98bc38ac6f52c6e01ca6927a3429ddd14
Summary:
Make `DB::GetUpdatesSince` return early if told to scan WALs generated by transactions
with write-prepared or write-unprepared policies (`seq_per_batch` is true), as indicated by
API comment.
Also add checks to `TransactionLogIterator` to clarify some conditions.
No API change.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9459
Test Plan:
make check
Closing https://github.com/facebook/rocksdb/issues/1565
Reviewed By: akankshamahajan15
Differential Revision: D33821243
Pulled By: riversand963
fbshipit-source-id: c8b155d020ce0980e2d3b3b1da40b96e65b48d79
Summary:
**This PR does not affect the functionality of `DB` and write-committed transactions.**
`CompactionIterator` uses `KeyCommitted(seq)` to determine if a key in the database is committed.
As the name 'write-committed' implies, if write-committed policy is used, a key exists in the database only if
it is committed. In fact, the implementation of `KeyCommitted()` is as follows:
```
inline bool KeyCommitted(SequenceNumber seq) {
// For non-txn-db and write-committed, snapshot_checker_ is always nullptr.
return snapshot_checker_ == nullptr ||
snapshot_checker_->CheckInSnapshot(seq, kMaxSequence) == SnapshotCheckerResult::kInSnapshot;
}
```
With that being said, we focus on write-prepared/write-unprepared transactions.
A few notes:
- A key can exist in the db even if it's uncommitted. Therefore, we rely on `snapshot_checker_` to determine data visibility. We also require that all writes go through transaction API instead of the raw `WriteBatch` + `Write`, thus at most one uncommitted version of one user key can exist in the database.
- `CompactionIterator` outputs a key as long as the key is uncommitted.
Due to the above reasons, it is possible that `CompactionIterator` decides to output an uncommitted key without
doing further checks on the key (`NextFromInput()`). By the time the key is being prepared for output, the key becomes
committed because the `snapshot_checker_(seq, kMaxSequence)` becomes true in the implementation of `KeyCommitted()`.
Then `CompactionIterator` will try to zero its sequence number and hit assertion error if the key is a tombstone.
To fix this issue, we should make the `CompactionIterator` see a consistent view of the input keys. Note that
for write-prepared/write-unprepared, the background flush/compaction jobs already take a "job snapshot" before starting
processing keys. The job snapshot is released only after the entire flush/compaction finishes. We can use this snapshot
to determine whether a key is committed or not with minor change to `KeyCommitted()`.
```
inline bool KeyCommitted(SequenceNumber sequence) {
// For non-txn-db and write-committed, snapshot_checker_ is always nullptr.
return snapshot_checker_ == nullptr ||
snapshot_checker_->CheckInSnapshot(sequence, job_snapshot_) ==
SnapshotCheckerResult::kInSnapshot;
}
```
As a result, whether a key is committed or not will remain a constant throughout compaction, causing no trouble
for `CompactionIterator`s assertions.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9830
Test Plan: make check
Reviewed By: ltamasi
Differential Revision: D35561162
Pulled By: riversand963
fbshipit-source-id: 0e00d200c195240341cfe6d34cbc86798b315b9f
Summary:
The minimum libzstd version that has `ZSTD_compressStream2` is
1.4.0 so only define ZSTD_STREAMING in that case.
Fixes building on Ubuntu 18.04 which has libzstd 1.3.3 as its
repository version.
Fixes https://github.com/facebook/rocksdb/issues/9795
Pull Request resolved: https://github.com/facebook/rocksdb/pull/9841
Test Plan:
Build and test on Ubuntu 18.04 with:
apt-get install libsnappy-dev zlib1g-dev libbz2-dev liblz4-dev \
libzstd-dev libgflags-dev g++ make curl
Reviewed By: ajkr
Differential Revision: D35648738
Pulled By: jay-zhuang
fbshipit-source-id: 2a9e969bcc17a7dc10172f3817283409de885811
