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https://issues.apache.org/jira/browse/HDFS-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14033128#comment-14033128
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Jing Zhao commented on HDFS-6545:
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Yeah, looks like we do not need to do an extra checkpoint while finalizing
rolling upgrade. The current patch looks good to me. One minor comment is that
for HA setup we do not need to call logSync since rollEditLog already covers
the sync part.
> Finalizing rolling upgrade can make NN unavailable for a long duration
> ----------------------------------------------------------------------
>
> Key: HDFS-6545
> URL: https://issues.apache.org/jira/browse/HDFS-6545
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.4.0
> Reporter: Kihwal Lee
> Priority: Critical
> Attachments: HDFS-6545.patch
>
>
> In {{FSNamesystem#finalizeRollingUpgrade()}}, {{saveNamespace()}} is directly
> called. For name nodes with a big name space, it can take minutes to save a
> new fsimage.
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