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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:
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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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