[jira] [Created] (HDFS-7382) DataNode in secure mode may throw NullPointerException if client connects before DataNode registers itself with NameNode.

[Chris Nauroth (JIRA)]

Chris Nauroth created HDFS-7382:
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             Summary: 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
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth
            Priority: Minor


{{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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