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From Apache Wiki <>
Subject [Cassandra Wiki] Trivial Update of "HintedHandoff_JP" by MakiWatanabe
Date Sat, 05 Feb 2011 07:11:03 GMT
Dear Wiki user,

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The "HintedHandoff_JP" page has been changed by MakiWatanabe.


  CassandraはHinted Handoffを次の目的で使用しています。
-  2.一貫性の要求が低いシステムにおいて、極めて高い書き込み可用性を提供する
+  1.一貫性の要求が低いシステムにおいて、極めて高い書き込み可用性を提供する
  A hinted write does NOT count towards ConsistencyLevel requirements of ONE, QUORUM, or ALL.
Take the simple example of a cluster of two nodes, A and B, and a replication factor of 1
(each key is stored on one node). Suppose node A is down while we write key K to it with ConsistencyLevel.ONE.
Then we must fail the write: recall from the API page that "if W + R >ReplicationFactor,
where W is the number of nodes to block for on write, and R the number to block for on reads,
you will have strongly consistent behavior; that is, readers will always see the most recent

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