[jira] [Created] (HDFS-5969) caller of NetworkTopology's chooseRandom method to be expect null return value

[Yongjun Zhang (JIRA)]

Yongjun Zhang created HDFS-5969:
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             Summary: caller of NetworkTopology's chooseRandom method to be 
expect null return value
                 Key: HDFS-5969
                 URL: https://issues.apache.org/jira/browse/HDFS-5969
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Yongjun Zhang
            Priority: Minor


Class NetworkTopology's method
   public Node chooseRandom(String scope) 
calls 
   private Node chooseRandom(String scope, String excludedScope)

which may return null value.

Caller of this method such as BlockPlacementPolicyDefault etc need to be aware 
that.





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