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https://issues.apache.org/jira/browse/HDFS-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905627#comment-13905627
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Yongjun Zhang commented on HDFS-5970:
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Thanks Junping.
> 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: namenode
> 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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