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From "Giridhar Addepalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6645) Host Affinity to facilitate faster restarts of kafka streams applications
Date Mon, 02 Apr 2018 10:37:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422107#comment-16422107
] 

Giridhar Addepalli commented on KAFKA-6645:
-------------------------------------------

[~guozhang]  & [~mjsax]

Thank you for comments.

We noticed the same behavior as you explained.

Might be good idea to include a line or two about host affinity feature in kafka streams documentation.

> 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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