I'm trying to profile my map/reduce processes under Hadoop 0.17.2. >From looking at the hadoop-default.xml, the property "mapred.task.profile.params" did not yet exist back then, so I'm trying to add to the property "mapred.child.java.opts" with -Xmx512m -verbose:gc -Xrunhprof:cpu=samples,depth=6,thread=y,file=/tmp/@tas...@.txt -Xloggc:/tmp/@tas...@.gc
The resulting JVMs won't have the hprof parameters when I look at them via PS, the files are never created and there is no mention of dumping stats in the logs. Am I missing something? I'd switch to 0.19.1, but I haven't had time to setup a migration plan for my data yet. Jimmy Wan
