Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-11615

FSNamesystemLock metrics can be inaccurate due to millisecond precision

    XMLWordPrintableJSON

Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 2.7.4
    • 2.9.0, 2.7.4, 3.0.0-alpha4, 2.8.2
    • hdfs
    • None
    • Reviewed

    Description

      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.

      Attachments

        1. HDFS-11615.001.patch
          15 kB
          Erik Krogen
        2. HDFS-11615.000.patch
          9 kB
          Erik Krogen

        Issue Links

          requires

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-14276 Add a nanosecond API to Time/Timer/FakeTimer

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

            People

              xkrogen Erik Krogen
              xkrogen Erik Krogen
              Votes:
              0 Vote for this issue
              Watchers:
              10 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: