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https://issues.apache.org/jira/browse/HDFS-15403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134700#comment-17134700
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hemanthboyina commented on HDFS-15403:
--------------------------------------

thanks [~tasanuma] for the review 
{quote} we should call onFailure() when NPE
{quote}
the NPE here is because of e.getMessage() is null , which is not the exception 
thrown by try block here

 

> NPE in FileIoProvider#transferToSocketFully
> -------------------------------------------
>
>                 Key: HDFS-15403
>                 URL: https://issues.apache.org/jira/browse/HDFS-15403
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: hemanthboyina
>            Assignee: hemanthboyina
>            Priority: Major
>         Attachments: HDFS-15403.001.patch
>
>
> {code:java}
> [DataXceiver for client  at /127.0.0.1:41904 [Sending block 
> BP-293397713-127.0.1.1-1591535936877:blk_-9223372036854775786_1001]] ERROR 
> datanode.DataNode (DataXceiver.java:run(324)) - 127.0.0.1:34789:DataXceiver 
> error processing READ_BLOCK operation  src: /127.0.0.1:41904 dst: 
> /127.0.0.1:34789[DataXceiver for client  at /127.0.0.1:41904 [Sending block 
> BP-293397713-127.0.1.1-1591535936877:blk_-9223372036854775786_1001]] ERROR 
> datanode.DataNode (DataXceiver.java:run(324)) - 127.0.0.1:34789:DataXceiver 
> error processing READ_BLOCK operation  src: /127.0.0.1:41904 dst: 
> /127.0.0.1:34789java.lang.NullPointerException
> at 
> org.apache.hadoop.hdfs.server.datanode.FileIoProvider.transferToSocketFully(FileIoProvider.java:283)
> at 
> org.apache.hadoop.hdfs.server.datanode.BlockSender.sendPacket(BlockSender.java:614)
> at 
> org.apache.hadoop.hdfs.server.datanode.BlockSender.doSendBlock(BlockSender.java:809)
> at 
> org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:756)
> at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:610)
> at 
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:152)
> at 
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:104
> at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:292)
> at java.lang.Thread.run(Thread.java:748) {code}



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