rkhachatryan opened a new pull request #12258:
URL: https://github.com/apache/flink/pull/12258
## What is the purpose of the change
See FLINK-17820 for full problem description. In short, Flink ignores
`state.backend.fs.memory-threshold` and always creates a file per subtask per
checkpoint.
This PR wraps `OutputStream` in `ChannelStateWriter` into a non-flushing
one; so that data can be flushed from `DataOutputStream`, but not to disk.
This solution was chosen:
- over changing the original stream because of lower risk
- over not flushing in `ChannelStateWriter` because that could lead to data
loss in `DataOutputStream`
## Verifying this change
Added `ChannelStateCheckpointWriterTest.testSmallFilesNotWritten`.
## 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, Kubernetes/Yarn/Mesos, ZooKeeper: yes
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicabl
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