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From: "Vinayakumar B (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-7884) NullPointerException in BlockSender
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    [ https://issues.apache.org/jira/browse/HDFS-7884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377288#comment-14377288 ] 

Vinayakumar B commented on HDFS-7884:
-------------------------------------

Thanks [~szetszwo] and [~brahmareddy]

> NullPointerException in BlockSender
> -----------------------------------
>
>                 Key: HDFS-7884
>                 URL: https://issues.apache.org/jira/browse/HDFS-7884
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Brahma Reddy Battula
>            Priority: Blocker
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7884-002.patch, HDFS-7884.patch, h7884_20150313.patch, org.apache.hadoop.hdfs.TestAppendSnapshotTruncate-output.txt
>
>
> {noformat}
> 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)
> {noformat}
> BlockSender.java:264 is shown below
> {code}
>       this.volumeRef = datanode.data.getVolume(block).obtainReference();
> {code}



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