Github user kishoreg commented on a diff in the pull request:
https://github.com/apache/helix/pull/266#discussion_r226866945
--- Diff: designs/aggregated-cluster-view/design.md ---
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+Aggregated Cluster View Design
+==============================
+
+## Introduction
+Currently Helix organize information by cluster - clusters are autonomous
entities that holds resource / node information.
+In real practice, a helix client might need to access aggregated
information of helix clusters from different data center regions for management
or coordination purpose.
+This design proposes a service in Helix ecosystem for clients to retrieve
cross-datacenter information in a more efficient way.
+
+
+## Problem Statement
+We identified a couple of use cases for accessing cross datacenter
information. [Ambry](https://github.com/linkedin/ambry) is one of them.
--- End diff --
can you expand more on why Ambry needs this feature?
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