Dhruvil Shah created KAFKA-8359:
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Summary: Reconsider default for leader imbalance percentage
Key: KAFKA-8359
URL: https://issues.apache.org/jira/browse/KAFKA-8359
Project: Kafka
Issue Type: Improvement
Reporter: Dhruvil Shah
By default, the leader imbalance ratio is 10%. This means that the controller
won't trigger preferred leader election for a broker unless the ratio of the
number of partitions a broker is the current leader of and the number of
partitions it is the preferred leader of is off by more than 10%. The problem
is when a broker is catching up after a restart, the smallest topics tend to
catch up first and the largest ones later, so the 10% remaining difference may
not be proportional to the broker's load. To keep better balance in the
cluster, we should consider setting `leader.imbalance.per.broker.percentage=0`
by default so that the preferred leaders are always elected.
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