[jira] [Commented] (HBASE-1648) heap usage and limit reporting doesn't work as expected when using G1 GC

["liang xie (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506375#comment-13506375 ] 

liang xie commented on HBASE-1648:
----------------------------------

emmm, it's not a hbase related bug,  some jdk tools don't work well with G1 on jdk6
                
> 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: 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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