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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6031) NN running newer software rejects loading the fsimage during rolling upgrade.
Date Fri, 28 Feb 2014 03:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915407#comment-13915407
] 

Haohui Mai commented on HDFS-6031:
----------------------------------

+1.

Nit: there's one trailing white space in this line.

{code}
+          && option.getRollingUpgradeStartupOption() 
{code}


> NN running newer software rejects loading the fsimage during rolling upgrade.
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-6031
>                 URL: https://issues.apache.org/jira/browse/HDFS-6031
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Haohui Mai
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h6031_20140227.patch, h6031_20140227b.patch, h6031_20140227c.patch
>
>
> During rolling upgrade, the standby NN that has a newer layout version will complain
about that the fsimage is too old, and require starting the NN using the {{-upgrade}} option:
> {noformat}
> File system image contains an old layout version -55. An upgrade to version -56 is required.
> {noformat}
> However, {{-upgrade}} is disabled during rolling upgrade, thus it is impossible to restart
the standby NN:
> {noformat}
> org.apache.hadoop.hdfs.protocol.RollingUpgradeException: Failed to upgrade namenode since
a rolling upgrade is already in progress. Existing rolling upgrade info:
> ...
> {noformat}



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