Hello Mahadev,

Thanks for the tip on GC parameters. I will try this.
I have increased the HBase default 10 second session 
timeout to 60 seconds, but will try the GC config
suggested here and begin reducing the timeout to
smaller values to determine its effect on the issues
I have been encountering.

Thanks again,

   - Andy

> From: Mahadev Konar
> Subject: Re: Preventing SessionExpired events
> Date: Wednesday, April 8, 2009, 1:40 PM
> Nitay,
> Thanks for sending us the info.
> We have experienced such gc problem in our HDFS (hadoop
> file system) setups. The gc had been quite a problem
> for us with the Namenode (hadoop hdfs) process. We have
> seen the namenode just stalling for minutes doing
> garbage collection. We currently run the namenode with
> the following gc options
> -XX:ParallelGCThreads=8 -XX:+UseConcMarkSweepGC
> And have avoided getting into trouble with the gc.


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