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https://issues.apache.org/jira/browse/HDFS-2947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-2947:
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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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