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https://issues.apache.org/jira/browse/HADOOP-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955055#comment-16955055
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Lisheng Sun commented on HADOOP-8159:
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I open Jira HADOOP-16662 to tackle this. Thank you. [~elgoiri]
> NetworkTopology: getLeaf should check for invalid topologies
> ------------------------------------------------------------
>
> Key: HADOOP-8159
> URL: https://issues.apache.org/jira/browse/HADOOP-8159
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Colin McCabe
> Assignee: Colin McCabe
> Priority: Major
> Fix For: 1.1.0, 2.0.0-alpha
>
> Attachments: HADOOP-8159-b1.005.patch, HADOOP-8159-b1.007.patch,
> HADOOP-8159.005.patch, HADOOP-8159.006.patch, HADOOP-8159.007.patch,
> HADOOP-8159.008.patch, HADOOP-8159.009.patch
>
>
> Currently, in NetworkTopology, getLeaf doesn't do too much validation on the
> InnerNode object itself. This results in us getting ClassCastException
> sometimes when the network topology is invalid. We should have a less
> confusing exception message for this case.
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