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

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  Each insertion (deletion) has to first write a log entry to the CommitLog.
  
-  * The writing of all log entries is handled by a single thread in 
CommitLogExecutorServece.
+  * The writing of all log entries is handled by a single thread in 
CommitLogExecutorService.
   * For each insert, the CommitLogHeader is first updated, if necessary.
    * For each ColumnFamily CF to be inserted, if the dirty bit for CF in the 
CommitLogHeader is off, the dirty bit is turned on and the replay offset for CF 
in the CommitLogHeader is updated with the current position in the CommitLog 
file.
   * A log entry is then added to the tail of the CommitLog file.

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