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Date: Tue, 12 Jun 2012 00:04:42 +0000 (UTC)
From: "Neha Narkhede (JIRA)" <jira@apache.org>
To: kafka-dev@incubator.apache.org
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Subject: [jira] [Updated] (KAFKA-360) Add ability to disable rebalancing in
 ZooKeeper consumer
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     [ https://issues.apache.org/jira/browse/KAFKA-360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neha Narkhede updated KAFKA-360:
--------------------------------

    Issue Type: Sub-task  (was: Bug)
        Parent: KAFKA-364
    
> Add ability to disable rebalancing in ZooKeeper consumer
> --------------------------------------------------------
>
>                 Key: KAFKA-360
>                 URL: https://issues.apache.org/jira/browse/KAFKA-360
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Chris Riccomini
>
> There is a need for a ZooKeeper-based Kafka consumer that does not re-balance. This is needed because we may be handling partitioning outside of Kafka. For example, I may have a stateful process that is meant to consume only from Partition 7 of a given Kafka topic. When that process stops, I don't want another consumer to take over partition 7.
> The benefits we get from using the ZooKeeper-based consumer (vs the Simple Consumer) without rebalancing is that offsets will still be handled by Kafka/ZK, as will failover when a partition's leader disappears/fails.
> I think the way to do this is to add a consumer config parameter that disables a consumer group's rebalancing. That way, the first consumer in the group to connect (when the ZK node is created) can specify if rebalancing should be enabled for the consumer group. If rebalancing is disabled, the consumers should be forced to supply a list of partition IDs that they wish to read from. Perhaps this can be done during the createMessageStreams call?

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