GitHub user zhijiangW opened a pull request:
https://github.com/apache/flink/pull/6417
[FLINK-9913][runtime] Improve output serialization only once in RecordWriter
## What is the purpose of the change
*This pull request improves the output serialization only once for multi
target channels in `RecordWriter`, rather than serialization as many times as
the number of selected channels.
## Brief change log
- *Only one `RecordSerializer` is created for all the output channels in
`RecordWriter`*
- *Restructure the processes of `emit`, `broadcastEmit`, randomEmit` in
`RecordWriter`*
- *Restructure the interface methods in `RecordSerializer`*
## Verifying this change
This change is already covered by existing tests, such as
*SpanningRecordSerializationTest*, etc.
And adds new tests in `RecordWriterTest` to verify:
- *The serialization results are correct by `RecordWriter#emit` with
`BroadcastPartitioner`*
- *The serialization results are correct by `RecordWriter#broadcastEmit`
directly*
## 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: (yes)
- The runtime per-record code paths (performance sensitive): (yes)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zhijiangW/flink FLINK-9913
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/6417.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 #6417
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commit 109ddb37abafcea28478b90cda10b965e0c399d5
Author: Zhijiang <wangzhijiang999@...>
Date: 2018-07-25T05:45:23Z
[FLINK-9913][runtime] Improve output serialization only once in RecordWriter
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