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https://issues.apache.org/jira/browse/HDFS-8127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-8127:
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Hadoop Flags: Reviewed
+1 the new patch looks good.
> NameNode Failover during HA upgrade can cause DataNode to finalize upgrade
> --------------------------------------------------------------------------
>
> Key: HDFS-8127
> URL: https://issues.apache.org/jira/browse/HDFS-8127
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.4.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Priority: Blocker
> Attachments: HDFS-8127.000.patch, HDFS-8127.001.patch
>
>
> Currently for HA upgrade (enabled by HDFS-5138), we use {{-bootstrapStandby}}
> to initialize the standby NameNode. The standby NameNode does not have the
> {{previous}} directory thus it does not know that the cluster is in the
> upgrade state. If NN failover happens, as response of block reports, the new
> ANN will tell DNs to finalize the upgrade thus make it impossible to rollback
> again.
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