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https://issues.apache.org/jira/browse/FLINK-9269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457526#comment-16457526
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ASF GitHub Bot commented on FLINK-9269:
---------------------------------------
Github user sihuazhou commented on the issue:
https://github.com/apache/flink/pull/5934
Hi @StefanRRichter sorry for the unclearly description here. What this PR
trying to fix is the mainly relate to the below code which run async:
```java
for (Map.Entry<String, StateTable<K, ?, ?>> kvState :
stateTables.entrySet()) {
// do something
} // this will just close the outer compression stream
```
the `stateTables` may cause concurrency problem.
> Concurrency problem in HeapKeyedStateBackend when performing checkpoint async
> -----------------------------------------------------------------------------
>
> Key: FLINK-9269
> URL: https://issues.apache.org/jira/browse/FLINK-9269
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.5.0
> Reporter: Sihua Zhou
> Assignee: Sihua Zhou
> Priority: Blocker
> Fix For: 1.5.0
>
>
> {code:java}
> @Nonnull
> @Override
> protected SnapshotResult<KeyedStateHandle> performOperation() throws
> Exception {
> // do something
> long[] keyGroupRangeOffsets = new
> long[keyGroupRange.getNumberOfKeyGroups()];
> for (int keyGroupPos = 0; keyGroupPos <
> keyGroupRange.getNumberOfKeyGroups(); ++keyGroupPos) {
> int keyGroupId = keyGroupRange.getKeyGroupId(keyGroupPos);
> keyGroupRangeOffsets[keyGroupPos] = localStream.getPos();
> outView.writeInt(keyGroupId);
> for (Map.Entry<String, StateTable<K, ?, ?>> kvState :
> stateTables.entrySet()) {
> // do something
> }
> }
> // do something
> }
> {code}
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