DataNode.createInterDataNodeProtocolProxy() guards a log at the wrong level
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                 Key: HDFS-977
                 URL: https://issues.apache.org/jira/browse/HDFS-977
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.22.0
            Reporter: Steve Loughran
            Priority: Trivial


My IDE tells me that this code snippet in 
{{DataNode.createInterDataNodeProtocolProxy()}} is guarding the info log entry 
at debug level, and it should be reviewed
{code}
    if (InterDatanodeProtocol.LOG.isDebugEnabled()) {
      InterDatanodeProtocol.LOG.info("InterDatanodeProtocol addr=" + addr);
    }
{code}

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