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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: High OS Load Numbers when idle
Date Tue, 17 Aug 2010 22:14:58 GMT
It's not normal, but then again I don't have access to your machines
so I can only speculate.

Does "top" show you which process is in %wa? If so and it's a java
process, can you figure what's going on in there?


On Tue, Aug 17, 2010 at 11:03 AM, George Stathis <gstathis@gmail.com> wrote:
> Hello,
> We have just setup a new cluster on EC2 using Hadoop 0.20.2 and HBase
> 0.20.3. Our small setup as of right now consists of one master and four
> slaves with a replication factor of 2:
> Master: xLarge instance with 2 CPUs and 17.5 GB RAM - runs 1 namenode, 1
> secondarynamenode, 1 jobtracker, 1 hbasemaster, 1 zookeeper (uses its' own
> dedicated EMS drive)
> Slaves: xLarge instance with 2 CPUs and 17.5 GB RAM each - run 1 datanode, 1
> tasktracker, 1 regionserver
> We have also installed Ganglia to monitor the cluster stats as we are about
> to run some performance tests but, right out of the box, we are noticing
> high system loads (especially on the master node) without any activity
> happening on the clister. Of course, the CPUs are not being utilized at all,
> but Ganglia is reporting almost all nodes in the red as the 1, 5 an 15
> minute load times are all above 100% most of the time (i.e. there are more
> than two processes at a time competing for the 2 CPUs time).
> Question1: is this normal?
> Question2: does it matter since each process barely uses any of the CPU
> time?
> Thank you in advance and pardon the noob questions.
> -GS

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