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Posted to dev@kafka.apache.org by "Ewen Cheslack-Postava (JIRA)" <ji...@apache.org> on 2017/05/12 04:04:04 UTC
[jira] [Updated] (KAFKA-3959) KIP-115: __consumer_offsets wrong
number of replicas at startup
[ https://issues.apache.org/jira/browse/KAFKA-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ewen Cheslack-Postava updated KAFKA-3959:
-----------------------------------------
Summary: KIP-115: __consumer_offsets wrong number of replicas at startup (was: __consumer_offsets wrong number of replicas at startup)
> KIP-115: __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: 0.11.0.0
>
>
> 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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