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From "Aaron T. Myers (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2947) HA: On startup NN throws an NPE in the metrics system
Date Tue, 14 Feb 2012 00:54:59 GMT
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


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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