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From Peter Schuller <peter.schul...@infidyne.com>
Subject Re: Cassandra Nodes Freeze/Down for ConcurrentMarkSweep GC?
Date Sun, 22 Aug 2010 22:57:02 GMT
> [4] Is GC ConcurrentMarkSweep a Stop-The-World situation? Where the
> JVM cannot do anything else? Hence then node is technically Down?
> Correct?

No; the concurrent mark/sweep phase runs concurrently with your
application. CMS will cause a stop-the-world full pause it it fails to
complete a CMS sweep in time and you hit the maximum heap size, but
unless that happens, CMS will run concurrently (though there are
stop-the-world pauses involved, that are typically very short, the
mark/sweep phase is concurrent).

As jbellis pointed out, you're almost certainly swapping.


-- 
/ Peter Schuller

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