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Posted to hdfs-dev@hadoop.apache.org by "Aaron T. Myers (Created) (JIRA)" <ji...@apache.org> on 2012/02/14 01:54:59 UTC
[jira] [Created] (HDFS-2947) HA: On startup NN throws an NPE in the
metrics system
HA: On startup NN throws an NPE in the metrics system
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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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[jira] [Resolved] (HDFS-2947) HA: On startup NN throws an NPE in
the metrics system
Posted by "Aaron T. Myers (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HDFS-2947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aaron T. Myers resolved HDFS-2947.
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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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