[HDFS-6285] tidy an error log inside BlockReceiver

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.0, 3.0.0-alpha1
• Component/s: datanode
• Labels: BB2015-05-RFC
• Hadoop Flags: Reviewed
• Assignee: Liang Xie
• Reporter: Liang Xie
• Created: 25/Apr/14 06:44
• Updated: 12/May/16 18:13
• Resolved: 08/May/15 11:57

Description

From this log from our production cluster:
2014-04-22,10:39:05,476 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in BlockReceiver constructor. Cause is

After reading code, i knew the cause was null which means no disk error. but the above log looked fragmentary. Attached is a minor change to tidy it.