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

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "Counters" page has been changed by johanoskarsson.
http://wiki.apache.org/cassandra/Counters?action=diff&rev1=6&rev2=7

--------------------------------------------------

  
  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 [[https://issues.apache.org/jira/browse/CASSANDRA-1072|CASSANDRA-1072]] and especially
the [[https://issues.apache.org/jira/secure/attachment/12459754/Partitionedcountersdesigndoc.pdf|design
doc]] for further information about how this works.
  

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