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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