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Date: Tue, 14 Feb 2012 08:44:00 +0000 (UTC)
From: "Aaron T. Myers (Resolved) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Resolved] (HDFS-2947) HA: On startup NN throws an NPE in
 the metrics system
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     [ https://issues.apache.org/jira/browse/HDFS-2947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron T. Myers resolved HDFS-2947.
----------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Thanks a lot for the review, Eli. I've just committed this to the HA branch.
                
> HA: On startup NN throws an NPE in the metrics system
> -----------------------------------------------------
>
>                 Key: HDFS-2947
>                 URL: https://issues.apache.org/jira/browse/HDFS-2947
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>            Priority: Minor
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: HDFS-2947-HDFS-1623.patch
>
>
> HDFS-2510 added some HA-specific metrics which check the NN's HAState. The NN initializes its HAState *after* the metrics are initialized, and thus we might hit an NPE during NN startup. This seems to be innocuous in that the NN's metrics still function, but it's poor form to log an unnecessary NPE.

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