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Posted to jira@kafka.apache.org by "m1a2st (via GitHub)" <gi...@apache.org> on 2026/09/11 14:23:10 UTC
[PR] KAFKA-20843: Custom consumer group assignors may silently use duplica… [kafka]
m1a2st opened a new pull request, #23433:
URL: https://github.com/apache/kafka/pull/23433
backport to 4.3
Fixed an issue where group.consumer.assignors did not check for assignor
name collisions. Previously, configuring duplicate assignors (such as
using both a short name and a fully qualified class name) or using a
custom assignor with a built-in name passed startup validation, but
caused runtime crashes later during group coordinator loading.
Key Changes:
Added broker-side duplicate name validation that throws ConfigException
at startup if two entries resolve to the same name.
Prevented custom assignors from reusing reserved built-in names (e.g.,
uniform, range).
Preserved support for configuring built-in assignors via their fully
qualified class names.
Added corresponding unit tests in GroupCoordinatorConfigTest and
verified existing integration tests.
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Re: [PR] KAFKA-20843: Custom consumer group assignors may silently use duplica… [kafka]
Posted by "m1a2st (via GitHub)" <gi...@apache.org>.
m1a2st commented on PR #23433:
URL: https://github.com/apache/kafka/pull/23433#issuecomment-5644338661
You're right. Since this fix introduces a behavior change, I won't cherry-pick it to 4.3.
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Re: [PR] KAFKA-20843: Custom consumer group assignors may silently use duplica… [kafka]
Posted by "m1a2st (via GitHub)" <gi...@apache.org>.
m1a2st closed pull request #23433: KAFKA-20843: Custom consumer group assignors may silently use duplica…
URL: https://github.com/apache/kafka/pull/23433
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Re: [PR] KAFKA-20843: Custom consumer group assignors may silently use duplica… [kafka]
Posted by "chia7712 (via GitHub)" <gi...@apache.org>.
chia7712 commented on PR #23433:
URL: https://github.com/apache/kafka/pull/23433#issuecomment-5638913693
@m1a2st please take a look at https://github.com/apache/kafka/pull/22982#discussion_r3992202754
I'm not convinced that a patch version should include this behaviour change to fix a low-risk issue. WDYT?
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Re: [PR] KAFKA-20843: Custom consumer group assignors may silently use duplica… [kafka]
Posted by "chia7712 (via GitHub)" <gi...@apache.org>.
chia7712 commented on PR #23433:
URL: https://github.com/apache/kafka/pull/23433#issuecomment-5635986367
@m1a2st would you please reference the original PR in the PR description?
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