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https://issues.apache.org/jira/browse/STORM-2914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352004#comment-16352004
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Jungtaek Lim commented on STORM-2914:
-------------------------------------

Thanks [~Srdo], merged into master.

Since there's some diverge between master and 1.x-branch for 
storm-kafka-client, I'd like to wait for [~Srdo] to submit pull request against 
1.x branch. We can merge it afterwards.

> Remove enable.auto.commit support from storm-kafka-client
> ---------------------------------------------------------
>
>                 Key: STORM-2914
>                 URL: https://issues.apache.org/jira/browse/STORM-2914
>             Project: Apache Storm
>          Issue Type: Improvement
>          Components: storm-kafka-client
>    Affects Versions: 2.0.0, 1.2.0
>            Reporter: Stig Rohde Døssing
>            Assignee: Stig Rohde Døssing
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.0.0
>
>         Attachments: storm-kafka-modes.ods
>
>          Time Spent: 4h 40m
>  Remaining Estimate: 0h
>
> The enable.auto.commit option causes the KafkaConsumer to periodically commit 
> the latest offsets it has returned from poll(). It is convenient for use 
> cases where messages are polled from Kafka and processed synchronously, in a 
> loop. 
> Due to https://issues.apache.org/jira/browse/STORM-2913 we'd really like to 
> store some metadata in Kafka when the spout commits. This is not possible 
> with enable.auto.commit. I took at look at what that setting actually does, 
> and it just causes the KafkaConsumer to call commitAsync during poll (and 
> during a few other operations, e.g. close and assign) with some interval. 
> Ideally I'd like to get rid of ProcessingGuarantee.NONE, since I think 
> ProcessingGuarantee.AT_MOST_ONCE covers the same use cases, and is likely 
> almost as fast. The primary difference between them is that AT_MOST_ONCE 
> commits synchronously.
> If we really want to keep ProcessingGuarantee.NONE, I think we should make 
> our ProcessingGuarantee.NONE setting cause the spout to call commitAsync 
> after poll, and never use the enable.auto.commit option. This allows us to 
> include metadata in the commit.



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