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From "Giridhar Addepalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-6645) Host Affinity to facilitate faster restarts of kafka streams applications
Date Tue, 13 Mar 2018 16:27:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-6645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Giridhar Addepalli updated KAFKA-6645:
--------------------------------------
    Summary: Host Affinity to facilitate faster restarts of kafka streams applications  (was:
Sticky Partition Assignment to facilitate faster restarts of kafka streams applications)

> 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 whatever reason, there is a way to use past assignment of partitions to machines
and there won't be need to build up state by reading off of changelog kafka topic and 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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