[HDFS-9594] DataNode threw NullPointerException

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.0-alpha1
• Component/s: datanode

Environment

Jenkins

• Assignee: Wei-Chiu Chuang
• Reporter: Wei-Chiu Chuang
• Created: 23/Dec/15 17:23
• Updated: 25/Oct/16 07:28

Description

In a precommit jenkins, I saw multiple exceptions.
https://builds.apache.org/job/PreCommit-HDFS-Build/13984/testReport/org.apache.hadoop.hdfs/TestDFSShell/testSymLinkReserved/

One of which is a null pointer exception in datanode.

2015-12-23 13:26:50,337 [DataNode: [[[DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/1/dfs/data/data1/, [DISK]file:/testptch/hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/1/dfs/data/data2/]]  heartbeating to localhost/127.0.0.1:38151] WARN  datanode.DataNode (BPServiceActor.java:run(859)) - Unexpected exception in block pool Block pool BP-1060337608-172.17.0.3-1450877209942 (Datanode Uuid 6b120576-5c02-402f-ab38-079295bda597) service to localhost/127.0.0.1:38151
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.datanode.DataNode.bpRegistrationSucceeded(DataNode.java:1391)
	at org.apache.hadoop.hdfs.server.datanode.BPOfferService.registrationSucceeded(BPOfferService.java:360)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.register(BPServiceActor.java:796)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:231)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:829)
	at java.lang.Thread.run(Thread.java:745)

Issue Links

• is related to: HDFS-10935 TestFileChecksum fails in some cases