Fix issue 5 - #6
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August 9, 2017 11:36
- modify getRackAwareAssignment(): wrap body within a 'while () { try {} .. catch {}}' with a decrementing initial node capacity.
- in assignOrphans(), sort candidates by current load rather than simply an unsorted list.
- add a new test 'testClusterRebalance'
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This fixes #5 reported by @s905060 where a new assignment could not be generated in some cases. The issue happens because the reassignment algorithm overoptimize to avoid movement of replicas at the cost of entering a state where a replica cannot be assigned to any broker. This PR fixes the issue by retrying assignment by allowing an incrementally-increasing number of partition movement, until an assignment succeeds.