Cleanup BlockReceiver and DataXceiver
-------------------------------------
Key: HDFS-1785
URL: https://issues.apache.org/jira/browse/HDFS-1785
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
{{clientName.length()}} is used multiple times for determining whether the
source is a client or a datanode.
{code}
if (clientName.length() == 0) {
//it is a datanode
}
{code}
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