Damian Guy created KAFKA-4696:
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Summary: Streams standby task assignment should be state-store
aware
Key: KAFKA-4696
URL: https://issues.apache.org/jira/browse/KAFKA-4696
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.2.0, 0.10.3.0
Reporter: Damian Guy
Fix For: 0.10.3.0
Task Assignment is currently not aware of which tasks have State Stores. This
can result in uneven balance of standby task assignment as all tasks are
assigned, but only those tasks with state-stores are ever created by
{{StreamThread}}. So what seems like an optimal strategy during assignment time
could be sub-optimal post-assignment.
For example, lets say we have 4 tasks (2 with state-stores), 2 clients,
numStandbyReplicas = 1. Each client would get 2 active and 2 standby tasks.
One of the clients may end up with both state-store tasks, while the other has
none.
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