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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "Operations" by JonathanEllis
Date Wed, 20 Jan 2010 23:45:41 GMT
Dear Wiki user,

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

The "Operations" page has been changed by JonathanEllis.


  == Hardware ==
  See [[CassandraHardware]]
+ == Tuning ==
+ See [[PerformanceTuning]]
  == Ring management ==
  Each Cassandra server [node] is assigned a unique Token that determines what keys it is
the primary replica for.  If you sort all nodes' Tokens, the Range of keys each is responsible
for is (!PreviousToken, !MyToken], that is, from the previous token (exclusive) to the node's
token (inclusive).  The machine with the lowest Token gets both all keys less than that token,
and all keys greater than the largest Token; this is called a "wrapping Range."

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