Kanak Biscuitwala created HELIX-151:
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Summary: Auto rebalance doesn't assign some replicas when other
nodes could make room
Key: HELIX-151
URL: https://issues.apache.org/jira/browse/HELIX-151
Project: Apache Helix
Issue Type: Bug
Components: helix-core
Reporter: Kanak Biscuitwala
Assignee: Kanak Biscuitwala
Priority: Minor
The current auto-rebalancer tries to evenly distribute replicas across nodes by
dividing the number of replicas by number of nodes, and then assigning the
floor as a capacity to some nodes and the ceiling as a capacity to other nodes.
Right now, nodes 0..k are assigned the ceiling and k+1..n are assigned the
floor. Given existing assignments, an orphaned partition could be assigned to a
node in the second set if that node had an extra slot, and there's at least one
node in the first set with available capacity, then the latter node should be
able to "donate" a unit of capacity to the former node.
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