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Table of Contents

Status

Current state: Accepted

Under Discussion thread: here

Discussion Vote thread: here

JIRA:

Jira
serverASF JIRA
columnskey,summary,type,created,updated,due,assignee,reporter,priority,status,resolution
serverId5aa69414-a9e9-3523-82ec-879b028fb15b
keyKAFKA-6774

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This has been summarized in table below.


When using subscribe(...)
(group management)		When using assign(...)
(standalone consumer)
group.id=""InvalidGroupException
  • Can fetch (last committed) offset
  • Can seek to specific offset
  • Can fetch from specific offset
  • Can commit offset

This can be confusing to users as they would likely expect the consumer treat the default group id the same way in these two cases. Using the default group id of "" is troublesome, and consumers are not normally expected to do that in a production setting. This KIP proposes deprecating the empty group id on the client, and changing the default group id to null so that unnecessary and unintentional offset fetches and commits are avoided.

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This is how these two group ids will work


When using subscribe(...)
(group management)

When using assign(...)
(standalone consumer)

group.id=null (new default)

InvalidGroupException
  • Cannot fetch offsets (uses auto.offset.reset config if no current offset is available)
  • Cannot commit offsets (
see updated OffsetCommit protocol below) and
  • enable.auto.commit is automatically set to false
.
  • )

group.id="" (specified by user)

(like before)(like before)
InvalidGroupException
  • Can fetch (last committed) offset
  • Can seek to specific offset
  • Can fetch from specific offset
  • Can commit offset


Client Side Deprecation

The use of empty group id will be deprecated on the client. A warning log will appear on clients that use this group id. 

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