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https://issues.apache.org/jira/browse/HDFS-15363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114181#comment-17114181
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Takanobu Asanuma commented on HDFS-15363:
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[~hemanthboyina] Good catch. +1 on [^HDFS-15363.001.patch]. The failed tests
seem not to be related.
> BlockPlacementPolicyWithNodeGroup should validate initialized NetworkTopology
> ------------------------------------------------------------------------------
>
> Key: HDFS-15363
> URL: https://issues.apache.org/jira/browse/HDFS-15363
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: hemanthboyina
> Assignee: hemanthboyina
> Priority: Major
> Attachments: HDFS-15363-testrepro.patch, HDFS-15363.001.patch
>
>
> BlockPlacementPolicyWithNodeGroup type casts the initialized clusterMap
> {code:java}
> NetworkTopologyWithNodeGroup clusterMapNodeGroup =
> (NetworkTopologyWithNodeGroup) clusterMap {code}
> If clusterMap is an instance of DFSNetworkTopology we get a ClassCastException
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