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From Thomas Stets <thomas.st...@gmail.com>
Subject Why periodical repairs?
Date Wed, 26 Sep 2012 08:26:56 GMT
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

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