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From Roshan <>
Subject Cassndra 1.0.6 GC query
Date Mon, 27 Feb 2012 21:45:52 GMT
Hi Experts

After getting an OOM error in production, I reduce the
-XX:CMSInitiatingOccupancyFraction to .45 (from .75) and
flush_largest_memtables_at to .45 (from .75). But still I am get an warning
message in production for the same Cassandra node regarding OOM. Also reduce
the concurrent compactions to one.

2012-02-27 08:01:12,913 WARN  [GCInspector] Heap is 0.45604122065696395
full.  You may need to reduce memtable and/or cache sizes.  Cassandra will
now flush up to the two largest memtables to free up memory.  Adjust
flush_largest_memtables_at threshold in cassandra.yaml if you don't want
Cassandra to do this automatically
2012-02-27 08:01:12,913 WARN  [StorageService] Flushing
CFS(Keyspace='WCache', ColumnFamily='WStandard') to relieve memory pressure

Could someone please explain why still I am getting GC warnings like above.
Many thanks.

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