[Hadoop Wiki] Update of "BookKeeper" by FlavioJunqueira

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The "BookKeeper" page has been changed by FlavioJunqueira:
http://wiki.apache.org/hadoop/BookKeeper?action=diff&rev1=2&rev2=3

  
  The BookKeeper data model is a flat namespace of ledgers identified by a long. The ledgers are append only and writable by a single client. The basic operations of BookKeeper are: createLedger to create a new ledger available for writing, openLedger to read from an existing ledger, addEntry, removeEntry, and closeLedger. Once a ledger is closed it becomes read-only.
  
- ''once the 3.2 release happens we will include a link to the documentation here''. 
+ Documentation:
+    * [[http://hadoop.apache.org/zookeeper|3.2 Documentation]] 
  
+ What is going on:
+    * Bookie recovery (BookieRecoveryPage)
+    * Bookie registration and failure detection (BookieRegPage)
+    * Ledger deletion (LedgerDeletionPage)
+