[HDFS-4255] Useless stacktrace shown in DN when there's an error writing a block

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.0.2-alpha
• Component/s: datanode
• Assignee: Unassigned
• Reporter: Harsh J
• Created: 01/Dec/12 14:16
• Updated: 13/Apr/13 03:48

Description

The DN sometimes carries these, especially when its asked to shutdown and there's ongoing write activity. The stacktrace is absolutely useless and may be improved, and the message it comes as part of is an INFO, which should not be the case when a stacktrace is necessary to be print (indicative of a trouble).

2012-12-01 19:10:23,167 INFO  datanode.DataNode (BlockReceiver.java:run(955)) - PacketResponder: BP-1493454111-192.168.2.1-1354369220726:blk_-8775461920430955284_1002, type=HAS_DOWNSTREAM_IN_PIPELINE
java.io.EOFException: Premature EOF: no length prefix available
	at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:171)
	at org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck.readFields(PipelineAck.java:116)
	at org.apache.hadoop.hdfs.server.datanode.BlockReceiver$PacketResponder.run(BlockReceiver.java:905)
	at java.lang.Thread.run(Thread.java:680)

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