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https://issues.apache.org/jira/browse/HDFS-3073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226445#comment-13226445
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Aaron T. Myers commented on HDFS-3073:
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Seems like this JIRA should perhaps be moved to Common?
> NetworkTopology::getLeaf should check for invalid topologies
> ------------------------------------------------------------
>
> Key: HDFS-3073
> URL: https://issues.apache.org/jira/browse/HDFS-3073
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
>
> Currently, NetworkTopology::getLeaf doesn't do too much validation on the
> NetworkTopology object itself. This results in us getting ClassCastException
> sometimes when the topology is invalid. We should have a less confusing
> exception message for this case.
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