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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 Tue, 17 Jun 2014 17:36:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14034076#comment-14034076
] 

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

The patch looks good to me. +1. Thanks for working on this, [~kihwal].

> 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
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-6545.patch, HDFS-6545.v2.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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