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https://issues.apache.org/jira/browse/NIFI-13452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17861234#comment-17861234
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Joe Witt commented on NIFI-13452:
---------------------------------

Given both the channel and timestamp are in the message then I'd simply make it 
clear this processor can/must follow the ConsumeSlack processor and that it 
will grab those values itself.

Given you might need to review these values multiple times I'd say it looks at 
specified attributes slack.ts and slack.channel or whatever and if present uses 
those to talk with Slack.  If not present as flowfile attributes it attempts to 
extract them from the slack message itself and then places them as attributes 
to expedite further check cycles.  

The problem here though is of ConsumeSlack doesn't add the timestamp because it 
might write many messages at once does this processor presume the users will 
have already run SplitJSon or split record?

I really encourage you to write down what the intended user flow is here end to 
end in terms of processors/attributes/content to really think through and 
expose details.  Otherwise nobody else can really participate/contribute to the 
discussion without a lot of effort.

> GetSlackReaction processor to fetch reactions
> ---------------------------------------------
>
>                 Key: NIFI-13452
>                 URL: https://issues.apache.org/jira/browse/NIFI-13452
>             Project: Apache NiFi
>          Issue Type: New Feature
>            Reporter: Zsihovszki Krisztina
>            Assignee: Zsihovszki Krisztina
>            Priority: Major
>
> The goal of this JIRA is to create a new processor so it'd possible to be 
> fetch the emojis added to a message in Slack.
>  



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