chencan created HDFS-11993:

             Summary: Add log info when connect to datanode socket address 
                 Key: HDFS-11993
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
            Reporter: chencan

In function BlockSeekTo, when connect faild to datanode socket address,log as 

DFSClient.LOG.warn("Failed to connect to " + targetAddr + " for block"
      + ", add to deadNodes and continue. " + ex, ex);

add block info may be more explicit.

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