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From "Onur Karaman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-3959) __consumer_offsets wrong number of replicas at startup
Date Thu, 26 Jan 2017 06:20:24 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Onur Karaman updated KAFKA-3959:
--------------------------------
    Fix Version/s:     (was: 0.10.3.0)
                   0.10.2.0

> __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: 0.10.2.0
>
>
> 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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