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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