[jira] [Created] (HDFS-11615) FSNamesystemLock metrics can be inaccurate due millisecond precision

["Erik Krogen (JIRA)" <ji...@apache.org>]

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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