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Posted to jira@kafka.apache.org by "Giridhar Addepalli (JIRA)" <ji...@apache.org> on 2018/04/02 10:39:00 UTC
[jira] [Resolved] (KAFKA-6645) Host Affinity to facilitate faster
restarts of kafka streams applications
[ https://issues.apache.org/jira/browse/KAFKA-6645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Giridhar Addepalli resolved KAFKA-6645.
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Resolution: Information Provided
> Host Affinity to facilitate faster restarts of kafka streams applications
> -------------------------------------------------------------------------
>
> Key: KAFKA-6645
> URL: https://issues.apache.org/jira/browse/KAFKA-6645
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Giridhar Addepalli
> Priority: Major
>
> Since Kafka Streams applications have lot of state in the stores in general, it would be good to remember the assignment of partitions to machines. So that when whole application is restarted for some reason, there is a way to use past assignment of partitions to machines and there won't be need to build up whole state by reading off of changelog kafka topic. This would result in faster start-up.
> Samza has support for Host Affinity ([https://samza.apache.org/learn/documentation/0.14/yarn/yarn-host-affinity.html])
> KIP-54 ([https://cwiki.apache.org/confluence/display/KAFKA/KIP-54+-+Sticky+Partition+Assignment+Strategy)] , handles cases where some members of consumer group goes down / comes up, and KIP-54 ensures there is minimal diff between assignments before and after rebalance.
> But to handle whole restart use case, we need to remember past assignment somewhere, and use it after restart.
> Please let us know if this is already solved problem / some cleaner way of achieving this objective
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