heap dump on GC overhead limit exceeded error

[Ted Yu]

Hi,
We use the following for mapred.child.java.opts:
 <value>-Xmx3800m -XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/usr/local/hadoop/hprof
-XX:ErrorFile=/usr/local/hadoop/hadoop/logs/userlogs/@taskid@
.hs_err.log</value>

We are troubleshooting GC overhead limit exceeded error in our reducer.
Is there a way to get heap dump on GC overhead limit exceeded error ?

Thanks