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https://issues.apache.org/jira/browse/HDFS-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-6545:
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Status: Patch Available (was: Open)
> 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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