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From Stas Oskin <stas.os...@gmail.com>
Subject Re: Datanode high memory usage
Date Tue, 01 Sep 2009 18:58:28 GMT

> With regards to memory, have you tried the compressed pointers JDK option
> (we saw great benefits on the NN)?  Java is incredibly hard to get a
> straight answer from with regards to memory.  You need to perform a GC first
> manually - the actual usage is the amount it reports used post-GC.  You can
> get these details by using JMX.
Will compressed pointers be used as standard in future versions of Hadoop?


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