[Cassandra Wiki] Update of "ArchitectureAntiEntropy" by StuHood

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The "ArchitectureAntiEntropy" page has been changed by StuHood.
http://wiki.apache.org/cassandra/ArchitectureAntiEntropy?action=diff&rev1=1&rev2=2

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      * The valid tree is broadcast to neighboring nodes via TreeResponse, and stored locally.
  3. When a node receives a TreeResponse, it passes the tree to rendezvous(), which checks for trees to rendezvous with / compare to:
    * If the tree is local, it is cached, and compared to any trees that were received from neighbors.
-   * If the tree is remote, it is immediately compared to a local tree if one is cached. Otherwise, the remote tree is stored until a local tree can be generated.
+   * If the tree is remote, it is immediately compared to a local tree if one is cached. Otherwise, the remote tree is cached in case a local tree is generated within TREE_STORE_TIMEOUT.
    * A Differencer object is enqueued for each comparison.
  4. Differencers are executed in AE_SERVICE_STAGE, to compare the two trees.
    * Based on the fraction of disagreement between the trees, the differencer will either perform repair via the io.Streaming api, or via RangeCommand read repairs.