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https://issues.apache.org/jira/browse/HDFS-9594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568382#comment-15568382
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Wei-Chiu Chuang commented on HDFS-9594:
---------------------------------------

I saw the same NPE when running tests in TestFileChecksum, and the NPE is 
reproducible consistently. (I run the tests on Mac)

> DataNode threw NullPointerException
> -----------------------------------
>
>                 Key: HDFS-9594
>                 URL: https://issues.apache.org/jira/browse/HDFS-9594
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0-alpha1
>         Environment: Jenkins
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>
> 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.
> {noformat}
> 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)
> {noformat}



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