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Date: Tue, 14 Feb 2012 05:21:01 +0000 (UTC)
From: "Eli Collins (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (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:comment-tabpanel&focusedCommentId=13207518#comment-13207518 ] 

Eli Collins commented on HDFS-2947:
-----------------------------------

+1 looks good
                
> 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
>         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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