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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Jira

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Today group coordinator will take in unlimited new members into the membership metadata. There is a potential risk described in

Jira
serverASF JIRA
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-7610
 where too many illegal joining members will burst broker memory before session timeout GC them. To ensure stability of the broker, we propose to enforce a hard limit on the size of consumer group in order to prevent explosion of server side cache/memory.

Public Interfaces

We shall add 

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

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