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From Aaron Kimball <aa...@cloudera.com>
Subject Re: Is combiner and map in same JVM?
Date Tue, 14 Apr 2009 17:52:01 GMT
They're in the same JVM, and I believe in the same thread.
- Aaron

On Tue, Apr 14, 2009 at 10:25 AM, Saptarshi Guha

> Hello,
> Suppose I have a Hadoop job and have set my combiner to the Reducer class.
> Does the map function and the combiner function run in the same JVM in
> different threads? or in different JVMs?
> I ask because I have to load a native library and if they are in the same
> JVM then the native library is loaded once and I have to take  precautions.
> Thank you
> Saptarshi Guha

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