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From "Arpit Gupta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1670) zookeeper should set a default value for SERVER_JVMFLAGS and CLIENT_JVMFLAGS so that memory usage is controlled
Date Tue, 03 Sep 2013 16:40:52 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756762#comment-13756762
] 

Arpit Gupta commented on ZOOKEEPER-1670:
----------------------------------------

bq. Also many folks are already specifying the heap size using the command line "SERVER_JVMFLAGS"
parameter. This change will now cause potential problems as the new defaults may override
the SERVER_JVMFLAGS settings already in place.

I dont think this is true as SERVER_JVMFLAGS is at the end. So if you were specifying the
heap size using SERVER_JVMFLAGS it should still be applied as the last heap size setting is
what will be the picked up.
                
> zookeeper should set a default value for SERVER_JVMFLAGS and CLIENT_JVMFLAGS so that
memory usage is controlled
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-1670
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1670
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.4.5
>            Reporter: Arpit Gupta
>            Assignee: Flavio Junqueira
>             Fix For: 3.5.0, 3.4.6
>
>         Attachments: ZOOKEEPER-1670.patch, ZOOKEEPER-1670.patch, ZOOKEEPER-1670.patch,
ZOOKEEPER-1670.patch, ZOOKEEPER-1670.patch
>
>
> We noticed this with jdk 1.6 where if no heap size is set the process takes up to 1/4
of mem available on the machine.
> More info http://stackoverflow.com/questions/3428251/is-there-a-default-xmx-setting-for-java-1-5
> You can run the following command to see what are the defaults for your machine
> {code}
> java -XX:+PrintFlagsFinal -version 2>&1 | grep -i -E 'heapsize|permsize|version'
> {code}
> And we noticed on two different class of machines that this was 1/4th of total memory
on the machine.

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