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https://issues.apache.org/jira/browse/HDFS-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17614925#comment-17614925
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caixiaofeng commented on HDFS-13614:
------------------------------------
meet this problem also. hadoop-3.1.1 version，with ARM CPU，not X86 CPU
java.lang.NullPointerException: null
at java.util.LinkedList$ListItr.next(LinkedList.java:893) ~[?:1.8.0_241]
at
org.apache.hadoop.net.SocketIOWithTimeout$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.hdfs.protocol.datatransfer.PacketReceiver.readChannelFully(PacketReceiver.java:256)
~[?:?]
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:207)
~[?:?]
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:169)
~[?:?]
at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:102)
~[?:?]
at
org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.readNextPacket(BlockReaderRemote.java:185)
~[?:?]
at
org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.read(BlockReaderRemote.java:143)
~[?:?]
at
org.apache.hadoop.hdfs.ByteArrayStrategy.readFromBlock(ReaderStrategy.java:118)
~[?:?]
at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:722)
~[?:?]
at
org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:783)
~[?:?]
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:843) ~[?:?]
at java.io.DataInputStream.read(DataInputStream.java:100) ~[?:1.8.0_241]
> 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=8133715]
>
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