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https://issues.apache.org/jira/browse/FLINK-8516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349100#comment-16349100
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ASF GitHub Bot commented on FLINK-8516:
---------------------------------------
GitHub user tweise reopened a pull request:
https://github.com/apache/flink/pull/5393
[FLINK-8516] Allow for custom hash function for shard to subtask mapping in
Kinesis consumer
## What is the purpose of the change
Allow the user to customize Kinesis shard to subtask assignment in the
Kinesis consumer.
## Brief change log
Added pluggable shard assigner.
## Verifying this change
Added unit test.
## 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
Javadoc
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tweise/flink FLINK-8516.shardHashing
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5393.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 #5393
----
commit ad4dbe6fb5bf2af52726c54b6361089ef3f4e369
Author: Thomas Weise <thw@...>
Date: 2018-01-31T01:44:44Z
[FLINK-8516] Allow for custom hash function for shard to subtask mapping in
Kinesis consumer
----
> FlinkKinesisConsumer does not balance shards over subtasks
> ----------------------------------------------------------
>
> Key: FLINK-8516
> URL: https://issues.apache.org/jira/browse/FLINK-8516
> Project: Flink
> Issue Type: Bug
> Components: Kinesis Connector
> Affects Versions: 1.4.0, 1.3.2, 1.5.0
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Priority: Major
>
> The hash code of the shard is used to distribute discovered shards over
> subtasks round robin. This works as long as shard identifiers are sequential.
> After shards are rebalanced in Kinesis, that may no longer be the case and
> the distribution become skewed.
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