[jira] [Created] (HDFS-5970) callers of NetworkTopology's chooseRandom method to expect null return value

[Yongjun Zhang (JIRA)]

Yongjun Zhang created HDFS-5970:
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             Summary: callers of NetworkTopology's chooseRandom method to 
expect null return value
                 Key: HDFS-5970
                 URL: https://issues.apache.org/jira/browse/HDFS-5970
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode, hdfs-client
    Affects Versions: 3.0.0
            Reporter: Yongjun Zhang


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

which may return null value.

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





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