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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "Operations" by PeterSchuller
Date Mon, 10 Jan 2011 22:21:58 GMT
Dear Wiki user,

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The "Operations" page has been changed by PeterSchuller.
The comment on this change is: Warn about not running repair at the same time on all nodes.


  === Frequency of nodetool repair ===
  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 (see [[DistributedDeletes]]). 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.
+ Consider how to schedule your repairs. A repair causes additional disk and CPU activity
on the nodes participating in the repair, and it will typically be a good idea to spread repairs
out over time so as to minimize the chances of repairs running concurrently on many nodes.
  ==== Dealing with the consequences of nodetool repair not running within GCGraceSeconds

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