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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-5889) When rolling upgrade is in progress, standby NN should create checkpoint for downgrade.
Date Thu, 13 Feb 2014 08:05:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE resolved HDFS-5889.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: HDFS-5535 (Rolling upgrades)
     Hadoop Flags: Reviewed

I have committed this.

> When rolling upgrade is in progress, standby NN should create checkpoint for downgrade.
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-5889
>                 URL: https://issues.apache.org/jira/browse/HDFS-5889
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: HDFS-5535 (Rolling upgrades)
>
>         Attachments: h5889_20140211.patch, h5889_20140212b.patch, h5889_20140212c.patch,
h5889_20140213.patch
>
>
> After rolling upgrade is started and checkpoint is disabled, the edit log may grow to
a huge size.  It is not a problem if rolling upgrade is finalized normally since NN keeps
the current state in memory and it writes a new checkpoint during finalize.  However, it is
a problem if admin decides to downgrade.  It could take a long time to apply edit log.  Rollback
does not have such problem.



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