[HDFS-15363] BlockPlacementPolicyWithNodeGroup should validate if it is initialized by NetworkTopologyWithNodeGroup

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.2.2, 3.3.1, 3.4.0
• Fix Version/s: 3.2.2, 3.3.1, 3.4.0
• Component/s: block placement
• Target Version/s: 3.2.2, 3.3.1, 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Hemanth Boyina
• Reporter: Hemanth Boyina
• Created: 19/May/20 13:56
• Updated: 5 days ago 22:36
• Resolved: 23/May/20 08:36

Description

BlockPlacementPolicyWithNodeGroup  type casts the initialized  clusterMap 

NetworkTopologyWithNodeGroup clusterMapNodeGroup =
    (NetworkTopologyWithNodeGroup) clusterMap 

If clusterMap is an instance of DFSNetworkTopology we get a ClassCastException

Issue Links

• breaks: HDFS-17655 Cannot run HDFS balancer with BlockPlacementPolicyWithNodeGroup