[jira] [Commented] (FLUME-3086) KafkaChannel commits consume offset to Zookeeper every time causing performance problem

["Jeff Holoman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLUME-3086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969211#comment-15969211 ] 

Jeff Holoman commented on FLUME-3086:
-------------------------------------

We expect folks to be using Kafka for offset storage, and using auto-commit on the channel would break our at least once guarantees as auto commit cannot ensure delivery. 

> KafkaChannel commits consume offset to Zookeeper every time causing performance problem
> ---------------------------------------------------------------------------------------
>
>                 Key: FLUME-3086
>                 URL: https://issues.apache.org/jira/browse/FLUME-3086
>             Project: Flume
>          Issue Type: Bug
>          Components: Kafka Channel
>    Affects Versions: 1.7.0
>            Reporter: JiYeon OH
>
> Currently, the AUTO_COMMIT_ENABLED setting is hard corded to false(KafkaChannel.java line 285), and the commit is done every transaction(KafkaChannel.java line 567). This will cause large overhead to Kafka Zookeeper when consuming very large amount of data because every consumer in every node will be writing to Zookeeper. 
> I actually had this problem and affected other running consumers' offsets on the Zookeeper. So I suggest to change the hard coded setting AUTO_COMMIT_ENABLED to true, and set a default AUTO_COMMIT_INTERVAL value, and remove the commitOffsets() method. 



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