Thursday, February 25, 2016

Hadoop MapReduce : Enabling JVM Profiling using -XPROF

The -Xprof profiler is the HotSpot profiler. HotSpot works by running Java code in interpreted mode, while running a profiler in parallel. The HotSpot profiler looks for "hot spots" in the code, i.e. methods that the JVM spends a significant amount of time running, and then compiles those methods into native generated code.
-Xprof is very handy to profile mapreduce code, here are few configuration parameters required to turn on profiling in mapreduce using -Xprof
mapreduce.task.profile='true'
mapreduce.task.profile.maps='0-'
mapreduce.task.profile.reduces='0-'
mapreduce.task.profile.params='-Xprof'
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