Jing Zhao created HDFS-5966:
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Summary: Fix rollback of rolling upgrade in NameNode HA setup
Key: HDFS-5966
URL: https://issues.apache.org/jira/browse/HDFS-5966
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jing Zhao
Assignee: Jing Zhao
This jira does the following:
1. When do rollback for rolling upgrade, we should call
FSEditLog#initJournalsForWrite when initializing editLog (just like Upgrade in
HA setup).
2. After the rollback, we also need to rename the md5 file and change its
reference file name.
3. Add a new unit test to cover rollback with HA+QJM
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