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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1648) heap usage and limit reporting doesn't work as expected when using G1 GC
Date Sun, 12 Jul 2009 09:25:14 GMT
heap usage and limit reporting doesn't work as expected when using G1 GC
------------------------------------------------------------------------

                 Key: HBASE-1648
                 URL: https://issues.apache.org/jira/browse/HBASE-1648
             Project: Hadoop HBase
          Issue Type: Bug
         Environment: Linux Centos x86_64 5.3, Sun JDK 1.6.0_14 (HotSpot 64-Bit Server VM
build 14.0-b16)
            Reporter: Andrew Purtell
            Priority: Minor


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:

{noformat}
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
{noformat}

top is about right:

{noformat}
  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
{noformat}

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

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