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  1. HBase
  2. HBASE-1648

heap usage and limit reporting doesn't work as expected when using G1 GC

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Invalid
    • None
    • None
    • None
    • None

    • Linux Centos x86_64 5.3, Sun JDK 1.6.0_14 (HotSpot 64-Bit Server VM build 14.0-b16)

    Description

      Getting some early experience with the G1 GC.

      Running with -Xmx1000m and HBASE_OPTS set to "-XX:+UnlockExperimentalVMOpts -XX:+UseG1GC". Regionserver heap use reports are not of much use:

      hbase(main):001:0> status 'simple'
3 live servers
    test3:60020 1247389283042
        requests=0, regions=1, usedHeap=0, maxHeap=41
    test2:60020 1247389219994
        requests=0, regions=1, usedHeap=0, maxHeap=41
    test4:60020 1247389324563
        requests=0, regions=2, usedHeap=0, maxHeap=41
0 dead servers

      top is about right:

        PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
23988 hadoop    24   0 1492m  98m  10m S  0.0  2.5   0:02.65 java

      Incidentally, don't try -XX:+UseG1GC and -XX:+DoEscapeAnalysis together or the JVM will rapidly segfault.

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          relates to

          Sub-task - The sub-task of the issue HBASE-2039 G1 GC issues

          • Major - Major loss of function.
          • Closed

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              Unassigned Unassigned
              apurtell Andrew Kyle Purtell
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                Created:
                Updated:
                Resolved: