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https://issues.apache.org/jira/browse/HBASE-3457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984498#action_12984498
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Ted Yu commented on HBASE-3457:
-------------------------------
When patch applied to attached hbase-env.sh, I saw duplicate parameters:
{code}
-Xmx4000m -ea -XX:+HeapDumpOnOutOfMemoryError -Xmx4000m -Xms4000m -Xmn400m
-XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70
-XX:+UseCMSInitiatingOccupancyOnly -XX:+UseParNewGC
-XX:+CMSParallelRemarkEnabled -ea -XX:+HeapDumpOnOutOfMemoryError -Xmx4000m
-Xms4000m -Xmn400m -XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled -ea
-XX:+HeapDumpOnOutOfMemoryError -Xmx4000m -Xms4000m -Xmn400m
-XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70
-XX:+UseCMSInitiatingOccupancyOnly -XX:+UseParNewGC
-XX:+CMSParallelRemarkEnabled
{code}
> Auto-tune some GC settings
> --------------------------
>
> Key: HBASE-3457
> URL: https://issues.apache.org/jira/browse/HBASE-3457
> Project: HBase
> Issue Type: Improvement
> Components: scripts
> Affects Versions: 0.90.1
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.90.1
>
> Attachments: hbase-3457.txt, hbase-3457.txt, hbase-env.sh
>
>
> The settings we ship with aren't really optimal for an actual deployment. We
> can take a look at some things like /proc/cpuinfo and figure out whether to
> enable parallel GC, turn off CMSIncrementalMode, etc.
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