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https://issues.apache.org/jira/browse/KAFKA-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849503#comment-15849503
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ASF GitHub Bot commented on KAFKA-3959:
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GitHub user ewencp opened a pull request:
https://github.com/apache/kafka/pull/2484
KAFKA-3959: Follow-up; move upgrade notes to 0.10.3 upgrade section.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ewencp/kafka kafka-3959-followup-upgrade-docs
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2484.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2484
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commit 49b8972220249932570a33610655af89878da7cd
Author: Ewen Cheslack-Postava <m...@ewencp.org>
Date: 2017-02-02T06:29:48Z
KAFKA-3959: Follow-up; move upgrade notes to 0.10.3 upgrade section.
----
> __consumer_offsets wrong number of replicas at startup
> ------------------------------------------------------
>
> Key: KAFKA-3959
> URL: https://issues.apache.org/jira/browse/KAFKA-3959
> Project: Kafka
> Issue Type: Bug
> Components: consumer, offset manager, replication
> Affects Versions: 0.9.0.1, 0.10.0.0, 0.10.0.1, 0.10.0.2, 0.10.1.0,
> 0.10.1.1, 0.10.1.2
> Environment: Brokers of 3 kafka nodes running Red Hat Enterprise
> Linux Server release 7.2 (Maipo)
> Reporter: Alban Hurtaud
> Assignee: Onur Karaman
> Priority: Blocker
> Labels: needs-kip, reliability
> Fix For: 0.10.3.0
>
>
> When creating a stack of 3 kafka brokers, the consumer is starting faster
> than kafka nodes and when trying to read a topic, only one kafka node is
> available.
> So the __consumer_offsets is created with a replication factor set to 1
> (instead of configured 3) :
> offsets.topic.replication.factor=3
> default.replication.factor=3
> min.insync.replicas=2
> Then, other kafka nodes go up and we have exceptions because the replicas #
> for __consumer_offsets is 1 and min insync is 2. So exceptions are thrown.
> What I missed is : Why the __consumer_offsets is created with replication to
> 1 (when 1 broker is running) whereas in server.properties it is set to 3 ?
> To reproduce :
> - Prepare 3 kafka nodes with the 3 lines above added to servers.properties.
> - Run one kafka,
> - Run one consumer (the __consumer_offsets is created with replicas =1)
> - Run 2 more kafka nodes
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