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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. http://wiki.apache.org/cassandra/Operations?action=diff&rev1=76&rev2=77 -------------------------------------------------- === 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 ====
