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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6545) Finalizing rolling upgrade can make NN unavailable for a long duration
Date Mon, 16 Jun 2014 22:42:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14033128#comment-14033128
] 

Jing Zhao commented on HDFS-6545:
---------------------------------

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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