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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5972) callers of NetworkTopology's chooseRandom method to expect null return value
Date Wed, 19 Feb 2014 00:51:29 GMT
Yongjun Zhang created HDFS-5972:
-----------------------------------

             Summary: callers of NetworkTopology's chooseRandom method to expect null return
value
                 Key: HDFS-5972
                 URL: https://issues.apache.org/jira/browse/HDFS-5972
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.3.0
            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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