THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Status
Current state: Under Discussion
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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
Motivation
Today group coordinator will take in unlimited number of join group requests into the membership metadata. There is a potential risk described in
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Public Interfaces
We shall propose to add a config new configuration into KafkaConfig.scala, and its behavior will affect the following coordinator APIs:
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val GroupMaxSize = "group.max.size" ... .define(GroupMaxSizeProp.define(GroupInitialRebalanceDelayMsProp, INT, Defaults.GroupInitialRebalanceDelayMsGroupMaxSize, MEDIUM, GroupInitialRebalanceDelayMsDoc) |
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.
A public interface is any change to the following:
Binary log format
The network protocol and api behavior
Any class in the public packages under clientsConfiguration, especially client configuration
org/apache/kafka/common/serialization
org/apache/kafka/common
org/apache/kafka/common/errors
org/apache/kafka/clients/producer
org/apache/kafka/clients/consumer (eventually, once stable)
Monitoring
Command line tools and arguments
- Anything else that will likely break existing users in some way when they upgrade
Proposed Changes
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GroupMaxSizeDoc) |
Proposed Changes
We shall add a config called group.max.size on the coordinator side.
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val GroupMaxSize = "group.max.size"
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.define(GroupMaxSizeProp, INT, Defaults.GroupMaxSize, MEDIUM, GroupMaxSizeDoc) |
Compatibility, Deprecation, and Migration Plan
- What impact (if any) will there be on existing users?
- If we are changing behavior how will we phase out the older behavior?
- If we need special migration tools, describe them here.
- When will we remove the existing behavior?
Rejected Alternatives
If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.