When a HDFS client fails to read a block (due to server failure) the namenode 
should log this
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                 Key: HADOOP-579
                 URL: http://issues.apache.org/jira/browse/HADOOP-579
             Project: Hadoop
          Issue Type: Improvement
          Components: dfs
            Reporter: eric baldeschwieler


Right now only client debugging info is available.  The fact that the client 
node needed to execute a failure mitigation strategy should be logged centrally 
so we can do analysis.

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