Krishan created KAFKA-6316:
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Summary: Kafka Rebalancing issues when I kill one consumer
Key: KAFKA-6316
URL: https://issues.apache.org/jira/browse/KAFKA-6316
Project: Kafka
Issue Type: Bug
Components: consumer
Affects Versions: 0.11.0.0
Reporter: Krishan
There is a very weird flow happening in the following case
I have 6 consumer processes running connected to a cluster of 3 brokers. 3 of
the consumers (set A) are subscribed to a particular set of topics (topics C)
and the other 3 consumers (set B) are subscribed to another set of topics
(topics D). All the topics belong to the same consumer group. All the topics
have a replication factor of 3 and are divided into 24 partitions. Each
consumer is automatically assigned to 8 partitions of the topic set it is
supposed to consume. I have set the assignment pattern to round robin.
If I kill a consumer from set A, topics C are repartitioned successfully in the
remaining consumers from set A. Each consumer in set A is now subscribed to 12
partitions from topics C.
But consumers in set B go crazy. All topics and all partitions in D are
assigned to any one consumer from B and the rest of the consumers remain idle -
All 24 partitions of all topics in set D are assigned to a single process.
I need some idea on how to debug this and what could be the issue?
I believe only the consumers in topic C should be affected. Consumer set B
should remain unaffected and definitely not assign all partitions to a single
process
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