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From Apache Wiki <>
Subject [Cassandra Wiki] Trivial Update of "Counters" by johanoskarsson
Date Wed, 05 Jan 2011 02:03:04 GMT
Dear Wiki user,

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The "Counters" page has been changed by johanoskarsson.


  Writes require CL.ONE.
    * The commutative design requires partitionability and idempotence between partitions.
+   * If a write fails unexpectedly (timeout for example) the client will not know if the
operation has been performed. A retry can result in an over count.
  == Operational considerations ==
+   * Reusing IP addresses will cause problems. Since the current version of the patch uses
machine ip addresses in the on disk data format as an identifier a reuse of an old address
will result in incorrect counts.
  == Further reading ==
  See [[|CASSANDRA-1072]] and especially
the [[|design
doc]] for further information about how this works.

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