NetworkTopology::getLeaf should check for invalid topologies
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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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