GitHub user shixiaogang opened a pull request:
https://github.com/apache/flink/pull/3859
[FLINK-6504] [FLINK-6467] [checkpoints] Add needed synchronization for
RocksDBIncrementalSnapshotOperation
This pull request adds missing synchronization for the access to the
following variables:
1. `materializedSstFiles` in `RocksDBKeyedStateBackend`: The variable may
be accessed simultaneously by the processing thread (read) and the
materialization threads (write). Now we use `asynchronousSnapshotLock` to
prevent concurrent access.
2. `newSstFiles`, `oldSstFiles` and `metaStateHandle` in
`RocksDBIncrementalSnapshotOperation`: These variables may be accessed by both
the cancel thread and the materialization thread. Though the materialization
thread are supposed to be stopped when `releaseResources()` is executed, we add
synchronization here to prevent potential conflicts.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shixiaogang/flink flink-6504
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3859.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3859
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commit 1c1a08e0f7db5ec8663a46c495468583983c7291
Author: xiaogang.sxg <[email protected]>
Date: 2017-05-10T01:55:34Z
Add needed synchronization for RocksDBIncrementalSnapshotOperation
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