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https://issues.apache.org/jira/browse/KAFKA-4969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16321183#comment-16321183
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ASF GitHub Bot commented on KAFKA-4969:
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bbejeck opened a new pull request #4410: KAFKA-4969: attempt to evenly
distribute load of tasks
URL: https://github.com/apache/kafka/pull/4410
This PR is an initial attempt to evenly distribute tasks with heavy
processing across clients using a somewhat naive approach.
The rationale is by making sure each task is not comprised entirely of the
same `topicGroupId`s,
then if there is one sub-topology doing heavy processing and another
sub-topology that is relatively light, the processing load is somewhat evenly
distributed.
This process only looks at active tasks; standby tasks are not given this
consideration as we can end up in a state where clients have the same task
assignments i.e [aT1, sT2] [aT2, sT1].
We plan to do a follow-on task at a later date where we weigh tasks with
state stores to
distribute tasks with state stores evenly.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> State-store workload-aware StreamsPartitionAssignor
> ---------------------------------------------------
>
> Key: KAFKA-4969
> URL: https://issues.apache.org/jira/browse/KAFKA-4969
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Matthias J. Sax
>
> Currently, {{StreamPartitionsAssigner}} does not distinguish different
> "types" of tasks. For example, task can be stateless of have one or multiple
> stores.
> This can lead to an suboptimal task placement: assume there are 2 stateless
> and 2 stateful tasks and the app is running with 2 instances. To share the
> "store load" it would be good to place one stateless and one stateful task
> per instance. Right now, there is no guarantee about this, and it can happen,
> that one instance processed both stateless tasks while the other processes
> both stateful tasks.
> We should improve {{StreamPartitionAssignor}} and introduce "task types"
> including a cost model for task placement. We should consider the following
> parameters:
> - number of stores
> - number of sources/sinks
> - number of processors
> - regular task vs standby task
> This improvement should be backed by a design document in the project wiki
> (no KIP required though) as it's a fairly complex change.
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