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From "Onur Karaman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3959) __consumer_offsets wrong number of replicas at startup
Date Fri, 12 Aug 2016 22:09:20 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15419587#comment-15419587

Onur Karaman commented on KAFKA-3959:

[~granthenke] maybe in the long term. But honestly I would prefer the simple, quick fix for
this edge case behavior without complicating the conversation with KIP-73 and KIP-46. To me,
the cluster not meeting replication factor requirements on an internal topic is another way
of saying the cluster isn't fully setup yet.

> __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:,
>         Environment: Brokers of 3 kafka nodes running Red Hat Enterprise Linux Server
release 7.2 (Maipo)
>            Reporter: Alban Hurtaud
> 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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