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https://issues.apache.org/jira/browse/HDFS-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17621534#comment-17621534
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caixiaofeng commented on HDFS-13614:
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Update, I found thie problem with ARM CPU//ARM-JDK 1.8.0_241
after update the client JDK to jdk1.8.0_302 // jdk1.8.0_332,this problem not
occured.
> 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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