wuchong opened a new pull request #12441:
URL: https://github.com/apache/flink/pull/12441
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## What is the purpose of the change
As discussed in the JIRA issue, operators shouldn't update value object of
state in the other processElement call. AppendOnlyTopNFunction doesn't follow
this, and I have checked all the operators in table module, this should be the
only one. All others either never update value obejct of state, or follow the
get-update-put operation in a single processElement.
## Brief change log
- Always shallow copy the list value when putting it into `dataState`.
- Update `FailingCollectionSource` to fail after at least one element was
checkpointed. This may uncover more failures like this one (but can't reproduce
this problem all the time).
## Verifying this change
It is hard to be reproduced using existing tests. I reproduce the problem
using @AHeise
s
[commit](https://github.com/apache/flink/commit/c05a0d865989c9959047cebcf2cd68b3838cc699),
and verified this fix manually.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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