Mailing-List: contact hbase-dev-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hbase-dev@hadoop.apache.org
Message-ID: <2027890928.1247441115044.JavaMail.jira@brutus>
Date: Sun, 12 Jul 2009 16:25:15 -0700 (PDT)
From: "stack (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1648) heap usage and limit reporting
 doesn't work as expected when using G1 GC
In-Reply-To: <621829775.1247390714792.JavaMail.jira@brutus>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HBASE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730166#action_12730166 ] 

stack commented on HBASE-1648:
------------------------------

If you set mx and ms (the minimum size on startup) == 1000m, does that help?

> 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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.