[KAFKA-930] Integrate preferred replica election logic into kafka

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8.1
• Assignee: Sriram
• Reporter: Sriram
• Created: 03/Jun/13 23:09
• Updated: 25/Feb/14 08:47
• Resolved: 23/Dec/13 18:09

Description

It seems useful to integrate the preferred replica election logic into kafka controller. A simple way to implement this would be to have a background thread that periodically finds the topic partitions that are not assigned to the preferred broker and initiate the move. We could come up with some heuristics to initiate the move only if the imbalance over a specific threshold in order to avoid rebalancing too aggressively. Making the software do this reduces operational cost.