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https://issues.apache.org/jira/browse/HDFS-5920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-5920:
----------------------------

    Attachment: HDFS-5920.001.patch

Update the patch:
# address Suresh's comments
# add unit tests for JN's rollback
# fix a bug in JN to update the committedTxnId after discarding journal 
segments.

> Support rollback of rolling upgrade in NameNode and JournalNodes
> ----------------------------------------------------------------
>
>                 Key: HDFS-5920
>                 URL: https://issues.apache.org/jira/browse/HDFS-5920
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: journal-node, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5920.000.patch, HDFS-5920.000.patch, 
> HDFS-5920.001.patch
>
>
> This jira provides rollback functionality for NameNode and JournalNode in 
> rolling upgrade.



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