NEERAJ VAIDYA created KAFKA-12972:
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Summary: KStreams - Rebalance not happening
Key: KAFKA-12972
URL: https://issues.apache.org/jira/browse/KAFKA-12972
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 2.7.0
Reporter: NEERAJ VAIDYA
I have a kafka streams application which consumes from a topic with 20
partitions.
I run the application with
{code:java}
num.streams.threads = 10
{code}
When I check the JMX MBean _kafka_consumer_coordinator_assigned_partitions_, I
can see that each thread has been assigned 2 partitions. That sounds reasonable
balancing of partitions across the threads.
Now, I add another instance of this application on a different machine/VM, but
I run it with 4 stream threads.
I was expecting these 4 threads to be assigned (via rebalancing) atleast 1
partition each, but after multiple rebalancing schedules (every 10 mins), I do
not see even 1 partition being assigned to any of these 4 threads in the second
instance of my application.
I would have expected some rebalancing to happen across the 14 (10 + 4) stream
threads of my application instances.
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