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https://issues.apache.org/jira/browse/HDFS-5972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904980#comment-13904980
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Yongjun Zhang commented on HDFS-5972:
-------------------------------------
Accidentally created multiple jiras for the same issue, due to the unexpected
response of JIRA gui.
> 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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