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https://issues.apache.org/jira/browse/HADOOP-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13236064#comment-13236064
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Colin Patrick McCabe commented on HADOOP-8159:
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Filed HDFS-3129 for the test-- will split that out of this patch.
> 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 Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HADOOP-8159-b1.005.patch, HADOOP-8159.005.patch,
> HADOOP-8159.006.patch, HADOOP-8159.007.patch, HADOOP-8159.008.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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