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Date: Tue, 14 Feb 2012 01:07:01 +0000 (UTC)
From: "Aaron T. Myers (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (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 updated HDFS-2947:
---------------------------------

    Attachment: HDFS-2947-HDFS-1623.patch

Here's a patch which addresses the issue. I manually verified that the NN no longer prints this NPE during startup. I also ran TestHAStateTransitions to make sure everything still works fine.
                
> 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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