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https://issues.apache.org/jira/browse/HDFS-6637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054551#comment-14054551
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Dian Fu commented on HDFS-6637:
-------------------------------

I wonder if we can remove the configuration "dfs.ha.standby.checkpoints" and 
always generate StandbyCheckpointer thread in SBN. Any thoughts?
 

> 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
>
> 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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