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Commit pipeline when write a WriteBatch for linearizability #267

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merged 4 commits into from
Mar 17, 2022
Merged

Commit pipeline when write a WriteBatch for linearizability #267

merged 4 commits into from
Mar 17, 2022

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Little-Wallace
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This method is proposed by pebble

I support async method so that the write thread does not need wait this writebatch committed.

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/test

@Little-Wallace Little-Wallace changed the title [WIP] Commit pipeline when write a WriteBatch for linearizability Commit pipeline when write a WriteBatch for linearizability Mar 2, 2022
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Little-Wallace commented Mar 2, 2022 •
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See benchmark result in https://docs.google.com/document/d/1s5Dj02hhe18zzwKTUZF4n1Bi0z6p5_d9TfoMkHKm2XE/edit

@Connor1996 Connor1996 self-requested a review March 8, 2022 07:44
Connor1996
Connor1996 reviewed Mar 13, 2022
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https://github.com/tikv/rocksdb/blob/336f6ab917c9861b16b8b1b0a4b0c3f70dcd1fb1/db/db_impl/db_impl_write.cc#L148-L149

Should check writer.status.ok()

Connor1996
Connor1996 reviewed Mar 13, 2022
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db/db_impl/db_impl_write.cc
assert(writer.state == WriteThread::STATE_COMPLETED);
TEST_SYNC_POINT("DBImpl::WriteImpl:CommitAfterWriteWAL");

if (writer.request->commit_lsn != 0 && writer.status.ok()) {
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@Connor1996 Connor1996 Mar 13, 2022 •
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How about writing like this, it's clearer

if (write.request -> commit_lsn == 0) {
  // 
} else if (write.status.ok()) {
  // 
} else {

}

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I do not think so....

Connor1996
Connor1996 reviewed Mar 13, 2022
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db/write_thread.h Outdated

private:
std::mutex commit_mu_;
std::condition_variable cv_;
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use InstrumentedCondVar?

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It seems heavily...

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@tabokie tabokie Mar 15, 2022 •
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You can use port::Mutex and port::CondVar. Honestly I don't know why the old code uses std::mutex.

@Connor1996 Connor1996 requested a review from tabokie March 13, 2022 15:09
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Please change the base branch to 6.4.tikv, rest LGTM

Connor1996
Connor1996 reviewed Mar 15, 2022
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tabokie
tabokie reviewed Mar 15, 2022
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@Little-Wallace Little-Wallace changed the base branch from tikv-5.2 to 6.4.tikv March 16, 2022 06:16
@Little-Wallace
support commit pipeline
527b170 
Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
@Little-Wallace
fix name
d53f764 
Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
@Little-Wallace
refactor writeimpl
664e67d 
Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Connor1996
Connor1996 approved these changes Mar 16, 2022
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LGTM

tabokie
tabokie reviewed Mar 16, 2022
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Rest looks good.

db/db_impl/db_impl_write.cc
WriteThread::WriteGroup wal_write_group;
mutex_.Lock();
if (writer.callback && !writer.callback->AllowWriteBatching()) {
WaitForPendingWrites();
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Why different than before?

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because we need to make sure that all memtable writes are applied before we checkcallback so that we can see a consistent result from DB

@Little-Wallace
fix variable
76fe681 
Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
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/test

@Little-Wallace Little-Wallace merged commit 21712fe into tikv:6.4.tikv Mar 17, 2022
@ti-srebot ti-srebot mentioned this pull request Mar 17, 2022
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@tabokie tabokie mentioned this pull request May 9, 2022
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tabokie pushed a commit to tabokie/rocksdb that referenced this pull request May 12, 2022
@Little-Wallace @tabokie
Commit pipeline when write a WriteBatch for linearizability (tikv#267)
225bff0 
* support commit pipeline

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>
tabokie added a commit that referenced this pull request May 12, 2022
@tabokie @Little-Wallace
Implement pipelined commit (#267) (#284)
d3e4138 
* add multibatch write into memtable (#131)

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>

Support write multiple WriteBatch into RocksDB together. These WriteBatch will be assigned sequence number in order and pushed into queue. If a thread is waiting for some state, it could steal some job from work queue.

Signed-off-by: tabokie <xy.tao@outlook.com>

* Improve Multi Batch Write (#154)

* perform like normal pipelined write

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* pass enable_multi_thread_write to BuildDBOptions (#170)

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* Fix life time of `memtable_write_group` (#171)

* fix life time of memtable_write_group

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* Commit pipeline when write a WriteBatch for linearizability (#267)

* support commit pipeline

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* format

Signed-off-by: tabokie <xy.tao@outlook.com>

* remove useless code

Signed-off-by: tabokie <xy.tao@outlook.com>

Co-authored-by: Wallace <bupt2013211450@gmail.com>
tabokie added a commit that referenced this pull request May 25, 2022
@tabokie @Little-Wallace
Implement pipelined commit (#267) (#284)
910417b 
* add multibatch write into memtable (#131)

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>

Support write multiple WriteBatch into RocksDB together. These WriteBatch will be assigned sequence number in order and pushed into queue. If a thread is waiting for some state, it could steal some job from work queue.

Signed-off-by: tabokie <xy.tao@outlook.com>

* Improve Multi Batch Write (#154)

* perform like normal pipelined write

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* pass enable_multi_thread_write to BuildDBOptions (#170)

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* Fix life time of `memtable_write_group` (#171)

* fix life time of memtable_write_group

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* Commit pipeline when write a WriteBatch for linearizability (#267)

* support commit pipeline

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>
Signed-off-by: tabokie <xy.tao@outlook.com>

* format

Signed-off-by: tabokie <xy.tao@outlook.com>

* remove useless code

Signed-off-by: tabokie <xy.tao@outlook.com>

Co-authored-by: Wallace <bupt2013211450@gmail.com>
@tabokie tabokie mentioned this pull request Jul 13, 2022
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@Connor1996 Connor1996 Connor1996 approved these changes

@tabokie tabokie tabokie approved these changes

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@Little-Wallace @Connor1996 @tabokie