John Roesler created KAFKA-14253:
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Summary: StreamsPartitionAssignor should print the member count in
assignment logs
Key: KAFKA-14253
URL: https://issues.apache.org/jira/browse/KAFKA-14253
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: John Roesler
Debugging rebalance and assignment issues is harder than it needs to be. One
simple thing that can help is to print out information in the logs that users
have to compute today.
For example, the StreamsPartitionAssignor prints two messages that contain the
the newline-delimited group membership:
{code:java}
[StreamsPartitionAssignor] [...-StreamThread-1] stream-thread
[...-StreamThread-1-consumer] All members participating in this rebalance:
<member UUID>: [<consumer ID>]
<member UUID>: [<consumer ID>]
<member UUID>: [<consumer ID>]{code}
and
{code:java}
[StreamsPartitionAssignor] [...-StreamThread-1] stream-thread
[...-StreamThread-1-consumer] Assigned tasks [...] including stateful [...] to
clients as:
<member UUID>=[activeTasks: ([...]) standbyTasks: ([...])]
<member UUID>=[activeTasks: ([...]) standbyTasks: ([...])]
<member UUID>=[activeTasks: ([...]) standbyTasks: ([...])
{code}
In both of these cases, it would be nice to:
# Include the number of members in the group (I.e., "15 members participating"
and "to 15 clients as")
# sort the member ids (to help compare the membership and assignment across
rebalances)
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