Erik Krogen created HDFS-11615:
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Summary: FSNamesystemLock metrics can be inaccurate due
millisecond precision
Key: HDFS-11615
URL: https://issues.apache.org/jira/browse/HDFS-11615
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.7.4
Reporter: Erik Krogen
Assignee: Erik Krogen
Currently the {{FSNamesystemLock}} metrics created in HDFS-10872 track the lock
hold time using {{Timer.monotonicNow()}}, which has millisecond-level
precision. However, many of these operations hold the lock for less than a
millisecond, making these metrics inaccurate. We should instead use
{{System.nanoTime()}} for higher accuracy.
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