[jira] [Updated] (KAFKA-265) Add a queue of zookeeper notifications in the zookeeper consumer to reduce the number of rebalancing attempts

["Jun Rao (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jun Rao updated KAFKA-265:
--------------------------

    Attachment: kafka-265.patch
    
> Add a queue of zookeeper notifications in the zookeeper consumer to reduce the number of rebalancing attempts
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-265
>                 URL: https://issues.apache.org/jira/browse/KAFKA-265
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: core
>    Affects Versions: 0.7
>            Reporter: Neha Narkhede
>            Assignee: Jun Rao
>             Fix For: 0.7.1
>
>         Attachments: kafka-265.patch
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> The correct fix for KAFKA-262 and other known issues with the current consumer rebalancing approach, is to get rid of the cache in the zookeeper consumer. 
> The side-effect of that fix, though, is the large number of zookeeper notifications that will trigger a full rebalance operation on the consumer. 
> Ideally, the zookeeper notifications can be batched and only one rebalance operation can be triggered for several such ZK notifications. 

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