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https://issues.apache.org/jira/browse/HDFS-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904969#comment-13904969
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Yongjun Zhang commented on HDFS-5969:
-------------------------------------
Accidentally created multiple jiras for the same issue, due to the unexpected
response of JIRA gui
> 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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