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https://issues.apache.org/jira/browse/HDFS-5965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yongjun Zhang resolved HDFS-5965.
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Resolution: Duplicate
> caller of NetworkTopology's chooseRandom method to be expect null return value
> ------------------------------------------------------------------------------
>
> Key: HDFS-5965
> URL: https://issues.apache.org/jira/browse/HDFS-5965
> 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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