[HDFS-7884] NullPointerException in BlockSender

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
• Component/s: datanode
• Labels: 2.6.1-candidate
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: Brahma Reddy Battula
• Reporter: Tsz-wo Sze
• Created: 04/Mar/15 15:47
• Updated: 30/Aug/16 01:38
• Resolved: 24/Mar/15 04:53

Description

java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:264)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:506)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:116)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:249)
	at java.lang.Thread.run(Thread.java:745)

BlockSender.java:264 is shown below

      this.volumeRef = datanode.data.getVolume(block).obtainReference();

Issue Links

• relates to: HDFS-7746 Add a test randomly mixing append, truncate and snapshot
• relates to: HDFS-7885 Datanode should not trust the generation stamp provided by client