Refactor BlockReceiver
----------------------
Key: HDFS-1833
URL: https://issues.apache.org/jira/browse/HDFS-1833
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Tsz Wo (Nicholas), SZE
Priority: Minor
There are repeated codes for creating log/error messages in BlockReceiver.
Also, some comment in the codes are incorrect, e.g.
{code}
private int numTargets; // number of downstream datanodes including myself
{code}
but the count indeed excludes the current datanode.
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