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https://issues.apache.org/jira/browse/HDFS-7382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205149#comment-14205149
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Yongjun Zhang commented on HDFS-7382:
-------------------------------------
HI [~cnauroth], Thanks for addressing my earlier comments, and suggestion.
I've created HDFS-7386 as a follow-up.
> DataNode in secure mode may throw NullPointerException if client connects
> before DataNode registers itself with NameNode.
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-7382
> URL: https://issues.apache.org/jira/browse/HDFS-7382
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, security
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Priority: Minor
> Fix For: 2.6.0
>
> Attachments: HDFS-7382.1.patch, HDFS-7382.2.patch
>
>
> {{SaslDataTransferServer#receive}} needs to check if the DataNode is
> listening on a privileged port. It does this by checking the address from
> the {{DatanodeID}}. However, there is a window of time when this will be
> {{null}}. If a client is still holding a {{LocatedBlock}} that references
> that DataNode and chooses to connect, then there is a risk of getting a
> {{NullPointerException}}.
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