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https://issues.apache.org/jira/browse/STORM-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15587560#comment-15587560
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Arun Mahadevan commented on STORM-1961:
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Hi [~jerrypeng] right now the updateStateByKey operation is built on top of
StatefulBolt abstraction that can save state externally. The other operations
maintain state in memory and rely on storms acking/replay mechanisms and so it
can provide only at-least once guarantees. I had some initial thoughts on how
we could improve this in future to provide a notion of exactly once. I will
update the design docs with more details soon.
> Come up with streams api for storm core use cases
> -------------------------------------------------
>
> Key: STORM-1961
> URL: https://issues.apache.org/jira/browse/STORM-1961
> Project: Apache Storm
> Issue Type: Sub-task
> Reporter: Arun Mahadevan
> Assignee: Arun Mahadevan
> Attachments: UnifiedStreamapiforStorm.pdf
>
>
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