Uploaded image for project: 'Hadoop Common'
  1. Hadoop Common
  2. HADOOP-14713

Audit for durations that should be measured via Time.monotonicNow

    XMLWordPrintableJSON

Details

    • Improvement
    • Status: Open
    • Major
    • Resolution: Unresolved
    • None
    • None
    • None

    Description

      Whenever we are measuring a time delta or duration in the same process, the timestamps probably should be using Time.monotonicNow rather than Time.now or System.currentTimeMillis. The latter two are directly reading the system clock which can move faster or slower than actual time if the system is undergoing a time adjustment (e.g.: adjtime or admin sets a new system time).

      We should go through the code base and identify places where the code is using the system clock but really should be using monotonic time.

      Attachments

        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-12526 FSDirectory should use Time.monotonicNow for durations

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

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-6964 BaileyBorweinPlouffe should use Time.monotonicNow for measuring durations

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

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-6965 QuasiMonteCarlo should use Time.monotonicNow for measuring durations

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

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-6966 DistSum should use Time.monotonicNow for measuring durations

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

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-6967 gridmix/SleepReducer should use Time.monotonicNow for measuring durations

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

          Bug - A problem which impairs or prevents the functions of the product. HDFS-12243 Trash emptier should use Time.monotonicNow()

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

          Bug - A problem which impairs or prevents the functions of the product. HDFS-12538 TestInstrumentationService should use Time.monotonicNow

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Patch Available
          relates to

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-14669 GenericTestUtils.waitFor should use monotonic time

          • Trivial - Cosmetic problem like misspelt words or misaligned text.
          • Resolved

          Activity

            People

              chetna Chetna Chaudhari
              jlowe Jason Darrell Lowe
              Votes:
              0 Vote for this issue
              Watchers:
              11 Start watching this issue

              Dates

                Created:
                Updated: