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  1. Hadoop YARN
  2. YARN-1297

FairScheduler: Move some logs to debug and check if debug logging is enabled


    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.9.0, 3.0.0-alpha1
    • Component/s: fairscheduler
    • Labels:
    • Hadoop Flags:


      I ran the Fair Scheduler's core scheduling loop through a profiler tool and identified a bunch of minimally invasive changes that can shave off a few milliseconds.

      The main one is demoting a couple INFO log messages to DEBUG, which brought my benchmark down from 16000 ms to 6000.

      A few others (which had way less of an impact) were

      • Most of the time in comparisons was being spent in Math.signum. I switched this to direct ifs and elses and it halved the percent of time spent in comparisons.
      • I removed some unnecessary instantiations of Resource objects
      • I made it so that queues' usage wasn't calculated from the applications up each time getResourceUsage was called.


        1. YARN-1297.005.patch
          16 kB
          Yufei Gu
        2. YARN-1297.006.patch
          8 kB
          Yufei Gu
        3. YARN-1297.3.patch
          13 kB
          Arun Suresh
        4. YARN-1297.4.patch
          16 kB
          Arun Suresh
        5. YARN-1297.4.patch
          16 kB
          Arun Suresh
        6. YARN-1297.patch
          17 kB
          Sandy Ryza
        7. YARN-1297.patch
          18 kB
          Sandy Ryza
        8. YARN-1297-1.patch
          17 kB
          Sandy Ryza
        9. YARN-1297-2.patch
          12 kB
          Sandy Ryza

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              • Assignee:
                yufeigu Yufei Gu
                sandyr Sandy Ryza
              • Votes:
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                • Created: