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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2039) G1 GC issues
Date Fri, 19 Feb 2010 17:48:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835849#action_12835849
] 

stack commented on HBASE-2039:
------------------------------

I ran more loadings overnight and it crashed again with above "Internal Error" after a while.
 Its better, but it crashes too much still.

The thread cited above had more added to it overnight.  A few interesting points made:

+ G1 uses way more CPU and its much spikier than CMS
+ Pauses are longer than those in CMS it seems

Looks like it has a ways to go yet.

The thread also talks of stuff being done in jdk7 not yet available to help with fragmentation
running CMS (currently only available if support contract): http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6631166



> G1 GC issues
> ------------
>
>                 Key: HBASE-2039
>                 URL: https://issues.apache.org/jira/browse/HBASE-2039
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>
> Lets keep an issue where we report on g1 issues.  Lets keep list of crashes we see.
> I filed an issue up on bug parade.  Lets see if it becomes actual bug.  Below I note
version of vm and the type of crash (Internal Error (nmethod.cpp:1981), pid=32319..... Its
a 'fatal error').  It happens for me after 5-10 minutes when a loading test.  Same thing each
time.
> G1 in 1.6 seems plain broke; crashes on use of stuff in concurrent utils package.
> Date Created: Thu Dec 10 13:33:04 MST 2009
> ..
> Synopsis:    Running G1 GC, crashes with " Internal Error (nmethod.cpp:1981), pid=32319..."
> Description:
>  FULL PRODUCT VERSION :
> java version "1.7.0-ea"
> Java(TM) SE Runtime Environment (build 1.7.0-ea-b77)
> Java HotSpot(TM) 64-Bit Server VM (build 17.0-b05, mixed mode)
> FULL OS VERSION :
> Fedora Core release 6 (Zod)
> EXTRA RELEVANT SYSTEM CONFIGURATION :
> Here are the JVM args:
> -XX:+HeapDumpOnOutOfMemoryError -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC

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