The Cassandra Operations page (http://wiki.apache.org/cassandra/Operations) says:
> Unless your application performs no deletes, it is vital that production clusters run nodetool repair periodically on all nodes in the cluster. The hard requirement for repair frequency is the value used for GCGraceSeconds Running nodetool repair often enough to guarantee that all nodes have performed a repair in a given period GCGraceSeconds long, ensures that deletes are not "forgotten" in the cluster. Is it really that common for deletes to be forgotten, or is it just a precaution against an unlikely-but-hard-to-fix problem? regards, Thomas
