Jiangjie Qin created KAFKA-2402:
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Summary: Broker should create zkpath /isr_change_notification if
it does not exist when updating ISR.
Key: KAFKA-2402
URL: https://issues.apache.org/jira/browse/KAFKA-2402
Project: Kafka
Issue Type: Bug
Reporter: Jiangjie Qin
Assignee: Jiangjie Qin
This is a follow up patch for KAFKA-1367.
When broker update ISR of partitions, it should ensure zkPath
/isr_change_notification exist. This does not matter when users do a clean
deploy of Kafka cluster because controller will always create the cluster. But
it matters when users are doing a rolling upgrade since the controller could
still be running on a old version broker. In that case, ZkNoNodeException will
be thrown and replica fetching will fail.
We can either document the upgrade process to ask user create the zk path
manually before upgrade or preferably we can handle it in the code.
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