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From Peter Schuller <>
Subject Re: Forcing Cassandra to free up some space
Date Wed, 15 Jun 2011 16:26:11 GMT
> Even if the gc call cleaned all files, it is not really acceptable on a
> decent sized cluster due to the impact full gc has on performance.
> Especially non-needed ones.

You can run with -XX:+ExplicitGCInvokesConcurrent to "safely" trigger
CMS cycles. However that also means System.gc() semantics changes so
I'm not sure off hand what'll happen to the auto-system.gc code in
cassandra that attempts to free space.

CASSANDRA-2521 is IMO the real solution.

/ Peter Schuller

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