GitHub user sihuazhou opened a pull request:
https://github.com/apache/flink/pull/5751
[FLINK-9060][state] Deleting state using KeyedStateBackend.getKeys() throws
Exception
## What is the purpose of the change
This PR fixes the problem when deleting state using
`KeyedStateBackend.getKeys()` throws Exception.
## Brief change log
- copy the result of `getKeys()` into `list` to avoid concurrency problem.
## Verifying this change
- *add a unit test in
`StateBackendTest#testConcurrentModificationWithGetKeys()` to verify this*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
no
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sihuazhou/flink
deletingStateUsingKeyedStateBackendGetKeys
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5751.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 #5751
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commit cba3a32f3af16ee92676b1e5b82b21af6fee610d
Author: sihuazhou <summerleafs@...>
Date: 2018-03-23T03:20:42Z
fix concurrency risk in HeapKeyedStateBackend#getKeys().
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