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From Peter Schuller <>
Subject Re: Cassandra Node Routinely Goes Down - 0.7 RC2
Date Wed, 22 Dec 2010 15:04:04 GMT
> I have been having problems running 0.7RC2 where one of my two nodes
> routinely goes down. Somtimes both of them go down. I am running the nodes
> using Ubuntu Lucid LTS 64-bit with kernal version 2.6.32. Currently, both
> nodes are running on micro instances on EC2. I will eventual migrate to
> large instance...but I can't seem to get Cassandra to stay up for more than
> 1 day at a time

We need more information. What does "go down" mean? Does the JVM get
killed? Does it stop responding to request but remains running? if the
latter, what does it do - does it spin CPU? What *does* show up in eg
the cassandra system log when this happens (error messages or not)?

You're saying you're running on micro instances. Have you configured
your node appropriately, in particular memory thresholds? If using the
out-of-the-box config on a micro instance (isn't that like 512 mb?),
the max heap size will probably be 256 mb. And with out-of-the-box
cassandra.yaml settings I would not be surprised if you're dying with
an OutOfMemory error and possibly with high amounts of GC activity
before actually dying.

/ Peter Schuller

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