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https://issues.apache.org/jira/browse/HDFS-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488492#comment-16488492
]
Surendra Singh Lilhore commented on HDFS-13614:
-----------------------------------------------
{noformat}
java.lang.NullPointerException
at java.util.LinkedList$ListItr.next(LinkedList.java:893)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.trimIdleSelectors(SocketIOWithTimeout.java:447)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.release(SocketIOWithTimeout.java:429)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:373)
at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:118)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:2483)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck.readFields(PipelineAck.java:244)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver$PacketResponder.run(BlockReceiver.java:1333)
at java.lang.Thread.run(Thread.java:748)
===============================================================================================================
java.lang.NullPointerException
at java.util.LinkedList$ListItr.next(LinkedList.java:893)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.trimIdleSelectors(SocketIOWithTimeout.java:447)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.get(SocketIOWithTimeout.java:417)
at
org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:325)
at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at java.io.DataInputStream.read(DataInputStream.java:149)
at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:204)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:213)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:134)
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:109)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:526)
at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:938)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:900)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:138)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:265)
at java.lang.Thread.run(Thread.java:748)
{noformat}
> DN failed to connect with NN because of NPE in SocketIOWithTimeout
> ------------------------------------------------------------------
>
> Key: HDFS-13614
> URL: https://issues.apache.org/jira/browse/HDFS-13614
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.7.2
> Reporter: Surendra Singh Lilhore
> Priority: Major
>
> {\{LinkedList$ListItr.next()}} is throwing NPE in {{SocketIOWithTimeout}}.
> Because of this socket connections are failing. It may be java bug also..
> https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8023148
>
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