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https://issues.apache.org/jira/browse/STORM-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16379601#comment-16379601
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Jungtaek Lim commented on STORM-2982:
-------------------------------------

Once applying I will try to avoid making change of core API, but we may want to 
bring the feature to the core API once it's applied and stabilized.

> Support exactly-once stateful processing with Streams API
> ---------------------------------------------------------
>
>                 Key: STORM-2982
>                 URL: https://issues.apache.org/jira/browse/STORM-2982
>             Project: Apache Storm
>          Issue Type: Improvement
>          Components: storm-client
>            Reporter: Jungtaek Lim
>            Assignee: Jungtaek Lim
>            Priority: Major
>
> This issue is to track the effort of supporting exactly-once stateful 
> processing with Streams API. Note that this issue doesn't cover end-to-end 
> exactly-once processing.



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