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From Edward Capriolo <>
Subject Re: Cassandra 0.7.8 and 0.8.1 fail when major compaction on 37GB database
Date Sun, 24 Jul 2011 16:20:35 GMT
On Sunday, July 24, 2011, lebron james <> wrote:
>   Hi, Please help me with my problem. For better performance i turn off
compaction and run massive inserts, after database reach 37GB i stop massive
inserts and start compaction with "NodeTool compaction Keyspace CFamily".
after half hour of work cassandra fall with error "Out of memory" i give
1500M to JVM, all parameters in yaml file are default. testing OS ubuntu
11.04 and windows server 2008 dc edition. Thanks!

Lebron good to see you have taken you talents from south beach to big data.

Though 1500mb is a lot of memory it is not a lot for cassandra. In
particular a burst of requests causes more memory allocation. Compaction is
intensive on the disk and memory system.

There are many things you can do to lower caches,optimize memtables, and
tune jvms. If you can spare more jvm memory that might help otherwise you
have a companion bug.

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