Summary:
When there are no range deletions, flush and compaction perform a binary search
on an effectively empty map every time they call ShouldDelete. This PR lazily
initializes each stripe map entry so that the binary search can be elided in
these cases.
After this PR, the total amount of time spent in compactions is 52.541331s, and the total amount of time spent in flush is 5.532608s, the former of which is a significant improvement from the results after #4495.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4497
Differential Revision: D10428610
Pulled By: abhimadan
fbshipit-source-id: 6f7e1ce3698fac3ef86d1197955e6b72e0931a0f
Summary:
Current implementation of perf context is level agnostic. Making it hard to do performance evaluation for the LSM tree. This PR adds `PerfContextByLevel` to decompose the counters by level.
This will be helpful when analyzing point and range query performance as well as tuning bloom filter
Also replaced __thread with thread_local keyword for perf_context
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4226
Differential Revision: D10369509
Pulled By: miasantreble
fbshipit-source-id: f1ced4e0de5fcebdb7f9cff36164516bc6382d82
Summary:
When a CompactRange() call for a level is truncated before the end key
is reached, because it exceeds max_compaction_bytes, we need to properly
set the compaction_end parameter to indicate the stop key. The next
CompactRange will use that as the begin key. We set it to the smallest
key of the next file in the level after expanding inputs to get a clean
cut.
Previously, we were setting it before expanding inputs. So we could end
up recompacting some files. In a pathological case, where a single key
has many entries spanning all the files in the level (possibly due to
merge operands without a partial merge operator, thus resulting in
compaction output identical to the input), this would result in
an endless loop over the same set of files.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4496
Differential Revision: D10395026
Pulled By: anand1976
fbshipit-source-id: f0c2f89fee29b4b3be53b6467b53abba8e9146a9
Summary:
Leverage existing `FlushJob` to implement atomic flush of multiple column families.
This PR depends on other PRs and is a subset of #3752 . This PR itself is not sufficient in fulfilling atomic flush.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4262
Differential Revision: D9283109
Pulled By: riversand963
fbshipit-source-id: 65401f913e4160b0a61c0be6cd02adc15dad28ed
Summary:
`CompactionIterator::snapshots_` is ordered by ascending seqnum, just like `DBImpl`'s linked list of snapshots from which it was copied. This PR exploits this ordering to make `findEarliestVisibleSnapshot` do binary search rather than linear scan. This can make flush/compaction significantly faster when many snapshots exist since that function is called on every single key.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4495
Differential Revision: D10386470
Pulled By: ajkr
fbshipit-source-id: 29734991631227b6b7b677e156ac567690118a8b
Summary:
WritePrepared is declared production ready (overdue update) and the benchmark results are also reported.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4494
Differential Revision: D10385336
Pulled By: maysamyabandeh
fbshipit-source-id: 662672ddfa286aa46af544f505b4d4b7a882d408
Summary:
Using const string& can avoid one extra string copy. This PR addresses a recent comment made by siying on #3933.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4491
Differential Revision: D10381211
Pulled By: riversand963
fbshipit-source-id: 27fc2d65d84bc7cd07833c77cdc47f06dcfaeb31
Summary:
Set the macro if default allocator is jemalloc. It doesn't handle the case when allocator is specified, e.g.
```
cpp_binary(
name="xxx"
allocator="jemalloc", # or "malloc" or something else
deps=["//rocksdb:rocksdb"],
)
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4489
Differential Revision: D10363683
Pulled By: yiwu-arbug
fbshipit-source-id: 5da490336a8e78e0feb0900c29e8036e7ec6f12b
Summary:
We would like to collect file-system-level statistics including file name, offset, length, return code, latency, etc., which requires to add callbacks to intercept file IO function calls when RocksDB is running.
To collect file-system-level statistics, users can inherit the class `EventListener`, as in `TestFileOperationListener `. Note that `TestFileOperationListener::ShouldBeNotifiedOnFileIO()` returns true.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/3933
Differential Revision: D10219571
Pulled By: riversand963
fbshipit-source-id: 7acc577a2d31097766a27adb6f78eaf8b1e8ff15
Summary:
The "je_" prefix of jemalloc APIs presents only when the macro `JEMALLOC_NO_RENAME` from jemalloc.h presents.
With the patch I'm also adding -DROCKSDB_JEMALLOC flag in buck TARGETS.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4488
Differential Revision: D10355971
Pulled By: yiwu-arbug
fbshipit-source-id: 03a2d69790a44ac89219c7525763fa937a63d95a
Summary:
This commit adds code to acquire lock on the DB LOCK file
before starting the repair process. This will prevent
multiple processes from performing repair on the same DB
simultaneously. Fixes repair_test to work with this change.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4435
Differential Revision: D10361499
Pulled By: riversand963
fbshipit-source-id: 3c512c48b7193d383b2279ccecabdb660ac1cf22
Summary:
The default behaviour of rocksdb is to use the `*A(` windows API functions.
These accept filenames in the currently configured system encoding,
be it Latin 1, utf8 or whatever.
If the Application intends to completely work with utf8 strings internally,
converting these to that codepage properly isn't even always possible.
Thus this patch adds a switch to use the `*W(` functions, which accept
UTF-16 filenames, and uses C++11 features to translate the
UTF8 containing std::string to an UTF16 containing std::wstring.
This feature is a compile time options, that can be enabled by setting `WITH_WINDOWS_UTF8_FILENAMES` to true.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4469
Differential Revision: D10356011
Pulled By: yiwu-arbug
fbshipit-source-id: 27b6ae9171f209085894cdf80069e8a896642044
Summary:
Using `./range_del_aggregator_bench --use_collapsed=false
--num_range_tombstones=5000 --num_runs=1000`, here are the results before and
after this change:
Before:
```
=========================
Results:
=========================
AddTombstones: 1822.61 us
ShouldDelete (first): 94.5286 us
```
After:
```
=========================
Results:
=========================
AddTombstones: 199.26 us
ShouldDelete (first): 38.9344 us
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4487
Differential Revision: D10347288
Pulled By: abhimadan
fbshipit-source-id: d44efe3a166d583acfdc3ec1199e0892f34dbfb7
Summary:
Closes https://github.com/facebook/rocksdb/issues/4462
I'm not sure if you'll be happy with `std::random_device{}`, perhaps you would want to use your rand instance instead. I didn't test to see if your rand instance supports the requirements that `std::shuffle` takes.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4482
Differential Revision: D10325133
Pulled By: yiwu-arbug
fbshipit-source-id: 47b7adaf4bb2b8d64cf090ea6b1b48ef53180581
Summary:
Wrong I overwrite `WriteBatch::Handler::Continue` to return _false_ at some point, I always get the `Status::Corruption` error.
I don't think this check is used correctly here: The counter in `found` cannot reflect all entries in the WriteBatch when we exit the loop early.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4478
Differential Revision: D10317416
Pulled By: yiwu-arbug
fbshipit-source-id: cccae3382805035f9b3239b66682b5fcbba6bb61
Summary:
Even during `DBIter::Prev()`, there is a case where we need to use `RangeDelPositioningMode::kForwardTraversal`. In particular, when we hit too many internal keys for a single user key, we use seek to find the newest internal key. If it's a merge operand, we then scan forwards, collecting the merge operands. This forward scan should be using `RangeDelPositioningMode::kForwardTraversal`.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4481
Differential Revision: D10319507
Pulled By: ajkr
fbshipit-source-id: b5ce7352461f3a7696b28a5136ae0076f2bde51f
Summary:
fix#4288
Add `OnCompactionBegin` support to `rocksdb::EventListener`.
Currently, we only have these three callbacks:
- OnFlushBegin
- OnFlushCompleted
- OnCompactionCompleted
As paolococchi requested in #4288 , and ajkr agreed, we should also support `OnCompactionBegin`.
This PR is a try to implement the support of `OnCompactionBegin`.
Hope it is useful to you.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4431
Differential Revision: D10055515
Pulled By: yiwu-arbug
fbshipit-source-id: 39c0f95f8e9ff1c7ca3a10787502a17f258d2334
Summary:
I wrote a couple tests using the public API to expose/prevent the bugs we talked. In particular,
- When files have overlapping endpoints and a range tombstone spans them, ensure the largest key does not reappear to readers. This was happening due to a bug that skipped writing range tombstones to an output file when their begin key exactly matched the file's largest key.
- When a tombstone spans multiple atomic compaction units, ensure newer keys do not disappear by being compacted beneath it. This happened due to a range tombstone appearing untruncated to readers when it spanned files with overlapping endpoints, even if it extended into files without overlapping endpoints (i.e., different atomic compaction units).
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4476
Differential Revision: D10286001
Pulled By: ajkr
fbshipit-source-id: bb5ca51d0f90812fb37bfe1d01aec93f7eda55aa
Summary:
If the query types being analyzed do not appear in the trace, the current trace_analyzer will use 0 as the begin time, which create the time duration from 1970/01/01 to the now time. It will waste huge memory. Fixed by adding the trace_create_time to limit the duration.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4473
Differential Revision: D10246204
Pulled By: zhichao-cao
fbshipit-source-id: 42850b080b2e62f586fe73afd7737c2246d1a8c8
Summary:
There is a bug when the write queue leader is blocked on a write
delay/stop, and the queue has writers with WriteOptions::no_slowdown set
to true. They are not woken up until the write stall is cleared.
The fix introduces a dummy writer inserted at the tail to indicate a
write stall and prevent further inserts into the queue, and a condition
variable that writers who can tolerate slowdown wait on before adding
themselves to the queue. The leader calls WriteThread::BeginWriteStall()
to add the dummy writer and then walk the queue to fail any writers with
no_slowdown set. Once the stall clears, the leader calls
WriteThread::EndWriteStall() to remove the dummy writer and signal the
condition variable.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4475
Differential Revision: D10285827
Pulled By: anand1976
fbshipit-source-id: 747465e5e7f07a829b1fb0bc1afcd7b93f4ab1a9
Summary:
this avoids a few copies of std::string and other structs
in the context of range-based for loops. instead of copying
the values for each iteration, use a const reference to avoid
copying.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4459
Differential Revision: D10282045
Pulled By: sagar0
fbshipit-source-id: 5012e910dca279abd2be847e1fb432d96274edfb
Summary:
The original logic was assuming that the only architectures that the code would build for on Windows were x86 and x64. This change will enable building for arm32 on Windows as well.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4349
Differential Revision: D10280887
Pulled By: sagar0
fbshipit-source-id: 9ca0bede25505d22e13acf916d38aeeaaf5d981a
Summary:
To more accurately truncate range tombstones at SST boundaries,
we now represent them in RangeDelAggregator using InternalKeys, which
are end-key-exclusive as they were before this change.
During compaction, "atomic compaction unit boundaries" (the range of
keys contained in neighbouring and overlaping SSTs) are propagated down
to RangeDelAggregator to truncate range tombstones at those boundariies
instead. See https://github.com/facebook/rocksdb/pull/4432#discussion_r221072219 and https://github.com/facebook/rocksdb/pull/4432#discussion_r221138683
for motivating examples.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4432
Differential Revision: D10263952
Pulled By: abhimadan
fbshipit-source-id: 2fe85ff8a02b3a6a2de2edfe708012797a7bd579
Summary:
Currently statistics are supposed to be dumped to info log at intervals of `options.stats_dump_period_sec`. However the implementation choice was to bind it with compaction thread, meaning if the database has been serving very light traffic, the stats may not get dumped at all.
We decided to separate stats dumping into a new timed thread using `TimerQueue`, which is already used in blob_db. This will allow us schedule new timed tasks with more deterministic behavior.
Tested with db_bench using `--stats_dump_period_sec=20` in command line:
> LOG:2018/09/17-14:07:45.575025 7fe99fbfe700 [WARN] [db/db_impl.cc:605] ------- DUMPING STATS -------
LOG:2018/09/17-14:08:05.643286 7fe99fbfe700 [WARN] [db/db_impl.cc:605] ------- DUMPING STATS -------
LOG:2018/09/17-14:08:25.691325 7fe99fbfe700 [WARN] [db/db_impl.cc:605] ------- DUMPING STATS -------
LOG:2018/09/17-14:08:45.740989 7fe99fbfe700 [WARN] [db/db_impl.cc:605] ------- DUMPING STATS -------
LOG content:
> 2018/09/17-14:07:45.575025 7fe99fbfe700 [WARN] [db/db_impl.cc:605] ------- DUMPING STATS -------
2018/09/17-14:07:45.575080 7fe99fbfe700 [WARN] [db/db_impl.cc:606]
** DB Stats **
Uptime(secs): 20.0 total, 20.0 interval
Cumulative writes: 4447K writes, 4447K keys, 4447K commit groups, 1.0 writes per commit group, ingest: 5.57 GB, 285.01 MB/s
Cumulative WAL: 4447K writes, 0 syncs, 4447638.00 writes per sync, written: 5.57 GB, 285.01 MB/s
Cumulative stall: 00:00:0.012 H:M:S, 0.1 percent
Interval writes: 4447K writes, 4447K keys, 4447K commit groups, 1.0 writes per commit group, ingest: 5700.71 MB, 285.01 MB/s
Interval WAL: 4447K writes, 0 syncs, 4447638.00 writes per sync, written: 5.57 MB, 285.01 MB/s
Interval stall: 00:00:0.012 H:M:S, 0.1 percent
** Compaction Stats [default] **
Level Files Size Score Read(GB) Rn(GB) Rnp1(GB) Write(GB) Wnew(GB) Moved(GB) W-Amp Rd(MB/s) Wr(MB/s) Comp(sec) Comp(cnt) Avg(sec) KeyIn KeyDrop
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4382
Differential Revision: D9933051
Pulled By: miasantreble
fbshipit-source-id: 6d12bb1e4977674eea4bf2d2ac6d486b814bb2fa
Summary:
- Fix DBImpl API race condition
The timeline of execution flow is as follow:
```
timeline user_thread1 user_thread2
t1 | cfh = GetColumnFamilyHandleUnlocked(0)
t2 | id1 = cfh->GetID()
t3 | GetColumnFamilyHandleUnlocked(1)
t4 | id2 = cfh->GetID()
V
```
The original implementation return a pointer to a stateful variable, so that the return `ColumnFamilyHandle` will be changed when another thread calls `GetColumnFamilyHandleUnlocked` with different `column family id`
- Expose ColumnFamily ID to compaction event listener
- Fix the return status of `DBImpl::GetLatestSequenceForKey`
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4391
Differential Revision: D10221243
Pulled By: yiwu-arbug
fbshipit-source-id: dec60ee9ff0c8261a2f2413a8506ec1063991993
Summary:
The controller you requested could not be found. PTAL
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4466
Differential Revision: D10241358
Pulled By: yiwu-arbug
fbshipit-source-id: 99664eb286860a6c8844d50efeb0ef6f0e10dd1e
Summary:
It also renames InstallMemtableFlushResults to MaybeInstallMemtableFlushResults to clarify its contract.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4464
Differential Revision: D10224918
Pulled By: maysamyabandeh
fbshipit-source-id: 04e3f2d8542002cb9f8010cb436f5152751b3cbe
Summary:
The contract of snprintf says that it returns "The number of characters that would have been written if n had been sufficiently large" http://www.cplusplus.com/reference/cstdio/snprintf/
The existing code however was assuming that the return value is the actual number of written bytes and uses that to reposition the starting point on the next call to snprintf. This leads to buffer overflow when the last call to snprintf has filled up the buffer.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4465
Differential Revision: D10224080
Pulled By: maysamyabandeh
fbshipit-source-id: 40f44e122d15b0db439812a0a361167cf012de3e
Summary:
The old error message was misleading because it led people to believe the truncation operation failed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4454
Differential Revision: D10203575
Pulled By: riversand963
fbshipit-source-id: c76482a132566635cb55d4c73d45c461f295ec43
Summary:
This fix is for `level == 0` in `GetOverlappingInputs()`:
- In `GetOverlappingInputs()`, if `level == 0`, it has potential
risk of overflow if `i == 0`.
- Optmize process when `expand = true`, the expected complexity
can be reduced to O(n).
Signed-off-by: JiYou <jiyou09@gmail.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4385
Differential Revision: D10181001
Pulled By: riversand963
fbshipit-source-id: 46eef8a1d1605c9329c164e6471cd5c5b6de16b5
Summary:
This is a conceptually simple change, but it touches many files to
pass the allocator through function calls.
We introduce CacheAllocator, which can be used by clients to configure
custom allocator for cache blocks. Our motivation is to hook this up
with folly's `JemallocNodumpAllocator`
(f43ce6d686/folly/experimental/JemallocNodumpAllocator.h),
but there are many other possible use cases.
Additionally, this commit cleans up memory allocation in
`util/compression.h`, making sure that all allocations are wrapped in a
unique_ptr as soon as possible.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4437
Differential Revision: D10132814
Pulled By: yiwu-arbug
fbshipit-source-id: be1343a4b69f6048df127939fea9bbc96969f564
Summary:
Before running CompactFilesTest.SentinelCompressionType, we should check
whether zlib and snappy are supported.
CompactFilesTest.SentinelCompressionType is a newly added test. Compilation and
linking with different options, e.g. COMPILE_WITH_TSAN, COMPILE_WITH_ASAN, etc.
lead to generation of different binaries. On the one hand, it's not clear why
zlib or snappy is present under ASAN, but not under TSAN. On the other hand,
changing the compilation flags for TSAN or ASAN seems a bigger change worth much
more attention. To unblock the cont-runs, I suggest that we simply add these
two checks at the beginning of the test, as we did for
GeneralTableTest.ApproximateOffsetOfCompressed in table/table_test.cc.
Future actions include invesigating the absence of zlib and snappy when
compiling with TSAN, i.e. COMPILE_WITH_TSAN=1, if necessary.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4443
Differential Revision: D10140935
Pulled By: riversand963
fbshipit-source-id: 62f96d1e685386accd2ef0b98f6f754d3fd67b3e
Summary:
In DBCompactionTestWithParam::ManualLevelCompactionOutputPathId, there is
a race condition between `DBTestBase::GetSstFileCount` and
`DBImpl::PurgeObsoleteFiles`. The following graph explains why.
```
Timeline db_compact_test_t bg_flush_t bg_compact_t
| [initiate bg flush and
| start waiting]
| flush
| DeleteObsoleteFiles
| [waken up by bg_flush_t which
| signaled in DeleteObsoleteFiles]
|
| [initiate compaction and
| start waiting]
|
| [compact,
| set manual.done to true]
| [signal at the end of
| BackgroundCallFlush]
|
| [waken up by bg_flush_t
| which signaled before
| returning from
| BackgroundCallFlush]
|
| Check manual.done is true
|
| GetSstFileCount <-- race condition --> PurgeObsoleteFiles
V
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4440
Differential Revision: D10122628
Pulled By: riversand963
fbshipit-source-id: 3ede73c39fee6ad804dc6ac1ed84759c7e63977f
Abhishek Madan