[jira] [Created] (KAFKA-6645) Sticky Partition Assignment across Kafka Streams application restarts

["Giridhar Addepalli (JIRA)" <ji...@apache.org>]

Giridhar Addepalli created KAFKA-6645:
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             Summary: Sticky Partition Assignment across Kafka Streams application restarts
                 Key: KAFKA-6645
                 URL: https://issues.apache.org/jira/browse/KAFKA-6645
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: Giridhar Addepalli


Since Kafka Streams applications have lot of state in the stores in the 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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