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https://issues.apache.org/jira/browse/HDFS-5966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905501#comment-13905501
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Tsz Wo (Nicholas), SZE commented on HDFS-5966:
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Patch looks good. A minor suggestion: add saveMD5File(File dataFile, String
digestString) to MD5FileUtils then both renameMD5File and the original
saveMD5File can use it.
> 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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