Antony Stubbs created KAFKA-7725: ------------------------------------ Summary: Add a delay for further CG rebalances, beyond KIP-134 group.initial.rebalance.delay.ms Key: KAFKA-7725 URL: https://issues.apache.org/jira/browse/KAFKA-7725 Project: Kafka Issue Type: New Feature Components: clients, consumer, core Affects Versions: 2.1.0 Reporter: Antony Stubbs
KIP-134 group.initial.rebalance.delay.ms was a good start, but there are much bigger problems where after a system is up and running, consumers can leave and join in large amounts, causing rebalance storms. One example is Mesosphere deploying new versions of an app - say there are 10 instances, then 10 more instances are deployed with the new version, then the old 10 are scaled down. Ideally this would be 1 or 2 rebalances, instead of 20. The trade off is that if the delay is 5 seconds, every consumer joining within that window would extend it by another 5 seconds, potentially causing partitions to never be processed. To mitigate this, either a max rebalance delay could also be added, or multiple consumers joining won't extend the rebalance delay, so that it's always a max of 5 seconds. Related: [KIP-345: Introduce static membership protocol to reduce consumer rebalances|https://cwiki.apache.org/confluence/display/KAFKA/KIP-345%3A+Introduce+static+membership+protocol+to+reduce+consumer+rebalances] KAFKA-7018: persist memberId for consumer restart -- This message was sent by Atlassian JIRA (v7.6.3#76005)