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From Alexander Shutyaev <>
Subject cassandra not responding, log full of gc invocations
Date Wed, 18 Sep 2013 12:10:48 GMT
Hi all!

We have a problem with cassandra 2.0. We have installed cassandra from
datastax community respository. We haven't changed any java options from
the default ones. De-facto Xmx is 1GB. Recently we have encountered a
couple of cases when cassandra stopped responding and the log was showing
some constant gc activity. My assumption is that the reason we are having
this is because of low Xmx. Although we don't have much load on this server
we do have a lot of column families (cql tables). If I understand correctly
each column family takes some memory for service purposes. Is that so? Is
there any Xmx recommendation formula that takes into account the column
family count and the read/write ops?

Thanks in advance!

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