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