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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "ArchitectureOverview" by GehrigKunz
Date Wed, 13 Nov 2013 00:19:09 GMT
Dear Wiki user,

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

The "ArchitectureOverview" page has been changed by GehrigKunz:


  You get consistency if R + W > N, where R is the number of records to read, W is the
number of records to write, and N is the replication factor.  A !ConsistencyLevel of ONE means
R or W is 1.  A !ConsistencyLevel of QUORUM means R or W is ceiling((N+1)/2).  A !ConsistencyLevel
of ALL means R or W is N.  So if you want to write with a !ConsistencyLevel of ONE and then
get the same data when you read, you need to read with !ConsistencyLevel ALL.
+ {{|stats}}

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