[HDFS-9727] Improve the exception's log output in DataXceiver

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.7.1
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 01/Feb/16 03:05
• Updated: 02/Feb/16 02:46

Description

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:

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;
      }

And this case is not only one, it looks frequent in DataXceiver methods.