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Justin Jack commented on KAFKA-7641: ------------------------------------ This change will require a KIP as it is a public interface change. I'm willing to go ahead with this if you'd like, as I know you're already working on ------------------------------------------- [frasi mondo com|https://frasimondo.com/] > Add `consumer.group.max.size` to cap consumer metadata size on broker > --------------------------------------------------------------------- > > Key: KAFKA-7641 > URL: https://issues.apache.org/jira/browse/KAFKA-7641 > Project: Kafka > Issue Type: Improvement > Components: core > Reporter: Boyang Chen > Assignee: Stanislav Kozlovski > Priority: Major > Labels: kip > Fix For: 2.2.0 > > > In the JIRA discussion https://issues.apache.org/jira/browse/KAFKA-7610, > Jason concluded an edge case of current consumer protocol which could cause > memory burst on broker side: > ```the case we observed in practice was caused by a consumer that was slow to > rejoin the group after a rebalance had begun. At the same time, there were > new members that were trying to join the group for the first time. The > request timeout was significantly lower than the rebalance timeout, so the > JoinGroup of the new members kept timing out. The timeout caused a retry and > the group size eventually become quite large because we could not detect the > fact that the new members were no longer there.``` > Since many disorganized join group requests are spamming the group metadata, > we should define a cap on broker side to avoid one consumer group from > growing too large. So far I feel it's appropriate to introduce this as a > server config since most times this value is only dealing with error > scenarios, client users shouldn't worry about this config. > KIP-389: > [https://cwiki.apache.org/confluence/display/KAFKA/KIP-389%3A+Introduce+a+configurable+consumer+group+size+limit] > -- This message was sent by Atlassian Jira (v8.3.4#803005)