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https://issues.apache.org/jira/browse/HDFS-5966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-5966:
----------------------------

    Attachment: HDFS-5966.000.patch

> 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
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5966.000.patch
>
>
> 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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