tomscut created HDFS-15808:
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Summary: Add metrics for FSNamesystem read/write lock warnings
Key: HDFS-15808
URL: https://issues.apache.org/jira/browse/HDFS-15808
Project: Hadoop HDFS
Issue Type: Wish
Components: hdfs
Reporter: tomscut
Assignee: tomscut
To monitor how often read/write locks exceed thresholds, we can add two
metrics(ReadLockWarning/WriteLockWarning), which are exposed in JMX.
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