[ http://issues.apache.org/jira/browse/HADOOP-41?page=all ]
[EMAIL PROTECTED] updated HADOOP-41:
------------------------------------
Attachment: TaskRunner_child_javaopts-v2.patch
Second attempt. Addresses Doug comment. In this patch, if
mapred.child.heap.size is present in configuration, rather than just ignore it,
its heap size setting wins out over any setting present in
mapred.child.java.opts and a warning is emitted that this setting is deprecated.
> JAVA_OPTS for the TaskRunner Child
> ----------------------------------
>
> Key: HADOOP-41
> URL: http://issues.apache.org/jira/browse/HADOOP-41
> Project: Hadoop
> Type: Improvement
> Components: conf
> Reporter: [EMAIL PROTECTED]
> Priority: Minor
> Attachments: TaskRunner_child_javaopts-v2.patch,
> TaskRunner_child_javaopts.patch
>
> Currently, its possible to set the java heap size the TaskRunner child runs
> in, but thats all thats configurable about the child process. Hereabouts,
> we've found it useful being able to specify other options for the child JVM,
> especially when debugging and monitoring long-lived processes.
> Examples of why its useful being able to set options are the child include:
> + Being able to set '-server' option or '-c64'.
> + Passing logging.properties to configure child logging.
> + Enable and capture to file verbose GC logging or start the SUN JVM JMX
> agent for the child process. Allows connecting with jconsole to watch
> long-lived children, their heap and thread usage, and when seemingly hung,
> take thread dumps.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
http://www.atlassian.com/software/jira
