Haohui Mai created HDFS-5251:
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             Summary: Race between the initialization of NameNode and the http 
server
                 Key: HDFS-5251
                 URL: https://issues.apache.org/jira/browse/HDFS-5251
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Haohui Mai
            Assignee: Haohui Mai


The constructor of NameNode starts a HTTP server before the FSNameSystem is 
initialized. Currently there is a race where the HTTP server can access the 
uninitialized namesystem variable, throwing a NullPointerException.

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