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https://issues.apache.org/jira/browse/HDFS-6637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067455#comment-14067455
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Dian Fu commented on HDFS-6637:
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This patch looks unrelated to the failed test. It was reported at HDFS-6694.
> Rolling upgrade won't finish if SBN is configured without StandbyCheckpointer
> -----------------------------------------------------------------------------
>
> Key: HDFS-6637
> URL: https://issues.apache.org/jira/browse/HDFS-6637
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Dian Fu
> Attachments: HDFS-6637.patch, HDFS-6637.patch.1
>
>
> In HA setup cluster, for rolling upgrade, the image file "fsimage_rollback"
> is generated by StandbyCheckpointer thread of SBN. While if configuration
> "dfs.ha.standby.checkpoints" is set false, there will be no
> StandbyCheckpointer thread in SBN. This will lead to the rolling upgrade
> never finish.
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