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From "liang xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1648) heap usage and limit reporting doesn't work as expected when using G1 GC
Date Mon, 03 Dec 2012 08:37:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508579#comment-13508579
] 

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

[~saint.ack@gmail.com] yes, it should be safe. we should not use G1 before JDK7u4

And also, i tried in a hbase0.94.0 + jdk6u22 + G1GC test env(not a good choice, aha):
hbase(main):003:0> status 'simple'
2 live servers
    ha3:60020 1354522267193
        requestsPerSecond=0, numberOfOnlineRegions=1, usedHeapMB=38, maxHeapMB=200
    ha2:60020 1354551060862
        requestsPerSecond=0, numberOfOnlineRegions=6, usedHeapMB=88, maxHeapMB=200
0 dead servers
Aggregate load: 0, regions: 7

the output is fine

And, i tried with jdk7u9 + G1GC as well:
hbase(main):002:0> status 'simple'
2 live servers
    ha2:60020 1354552532489
        requestsPerSecond=0, numberOfOnlineRegions=5, usedHeapMB=46, maxHeapMB=200
    ha3:60020 1354523738930
        requestsPerSecond=0, numberOfOnlineRegions=2, usedHeapMB=44, maxHeapMB=200
0 dead servers
Aggregate load: 0, regions: 7

still good
                
> 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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