zhangmeng916 commented on pull request #1307:
URL: https://github.com/apache/helix/pull/1307#issuecomment-698102117


   This PR is ready to merge. Approved by @jiajunwang 
   Final commit message:
   Add TrieClusterTopology for retrieving hierarchical topology in a cluster.
   - Add TrieNode class to define a node in the trie
   - Add ClusterTrie class to handle the construction, validation and retrieval 
of nodes/paths in the trie.
   - Add ClusterTopology class to provide different APIs for users to retrieve 
cluster topology information.
   - Add APIs in HelixAdmin to retrieve ClusterTopology of a specific cluster.
   


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