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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5967) caller of NetworkTopology's chooseRandom method to be expect null return value
Date Wed, 19 Feb 2014 01:26:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904949#comment-13904949
] 

Yongjun Zhang commented on HDFS-5967:
-------------------------------------

Accidentally created multiple jiras for the same issue, due to the unexpected response of
JIRA gui today.

> caller of NetworkTopology's chooseRandom method to be expect null return value
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-5967
>                 URL: https://issues.apache.org/jira/browse/HDFS-5967
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            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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