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https://issues.apache.org/jira/browse/HDFS-9124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei (Eddy) Xu resolved HDFS-9124.
---------------------------------
       Resolution: Duplicate
    Fix Version/s: 2.7.4

It was fixed in HDFS-9574.

> NullPointerException when underreplicated blocks are there
> ----------------------------------------------------------
>
>                 Key: HDFS-9124
>                 URL: https://issues.apache.org/jira/browse/HDFS-9124
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Syed Akram
>            Assignee: Syed Akram
>             Fix For: 2.7.4
>
>
> 2015-09-22 09:48:47,830 ERROR 
> org.apache.hadoop.hdfs.server.datanode.DataNode: dn1:50010:DataXceiver error 
> processing WRITE_BLOCK operation  src: /dn1:42973 dst: /dn2:50010
> java.lang.NullPointerException
>         at 
> org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:186)
>         at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:677)
>         at 
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
>         at 
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
>         at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:251)
>         at java.lang.Thread.run(Thread.java:744)



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