[jira] [Created] (HDFS-9727) Improve the exception's log output in DataXceiver

["Lin Yiqun (JIRA)" <ji...@apache.org>]

Lin Yiqun created HDFS-9727:
-------------------------------

             Summary: Improve the exception's log output in DataXceiver
                 Key: HDFS-9727
                 URL: https://issues.apache.org/jira/browse/HDFS-9727
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 2.7.1
            Reporter: Lin Yiqun
            Assignee: Lin Yiqun
            Priority: Minor


There are some not appropriate logLevel output in many palaces of {{DataXceiver}}. When some exceptions happened, the output logLevel often  the info level not warn. Like these:
{code}
try {
        blockSender = new BlockSender(block, blockOffset, length,
            true, false, sendChecksum, datanode, clientTraceFmt,
            cachingStrategy);
      } catch(IOException e) {
        String msg = "opReadBlock " + block + " received exception " + e; 
        LOG.info(msg);
        sendResponse(ERROR, msg);
        throw e;
      }
{code}
And this case is not only one, it looks frequent in DataXceiver methods.



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