Add offset in client trace
--------------------------

                 Key: HADOOP-5222
                 URL: https://issues.apache.org/jira/browse/HADOOP-5222
             Project: Hadoop Core
          Issue Type: Improvement
          Components: dfs
    Affects Versions: 0.21.0
            Reporter: Lei Xu
            Priority: Minor
             Fix For: 0.21.0


By adding offset in client trace, the client trace information can provide more 
accurately information about I/O.
It is useful for performance analyzing.

Since there is  no random write now, the offset of writing is always zero.


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