[HDFS-2906] NullPointerExeception in BlockReceiver on DataNode restart.

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.23.0
• Component/s: datanode
• Assignee: Uma Maheswara Rao G
• Reporter: Brahma Reddy Battula
• Created: 07/Feb/12 05:06
• Updated: 26/Jul/13 05:15

Description

Scenario:
1) Start the cluster with one NN and two DN's.
2) Keep restart one DN for every 10mins.
3) Let's keep the clients to write the data continuosly.

Observed below trace.

2012-02-07 01:03:45,897 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: HOST-10-18-40-23:50010:DataXceiver error processing WRITE_BLOCK operation  src: /10.18.40.20:23862 dest: /10.18.40.23:50010
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:151)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:340)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:98)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:66)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:167)
	at java.lang.Thread.run(Thread.java:619)
2012-02-07 01:03:46,083 INFO org.apache.hadoop.hdfs.server.common.Storage: Locking is disabled