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https://issues.apache.org/jira/browse/STREAMS-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604118#comment-15604118
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Steve Blackmon commented on STREAMS-124:
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I think it’s an open question whether keeping track of how many datums each 
providers provides, processor processes, and persister persists should be the 
responsibility of those classes or of whatever framework is calling them.  
Doing so complicates the code, slows execution, and is pretty much pointless 
for many deployments where components are embedded within a runtime framework 
that has it's own system for keeping track of such things.

> Fix DatumCountable Interface
> ----------------------------
>
>                 Key: STREAMS-124
>                 URL: https://issues.apache.org/jira/browse/STREAMS-124
>             Project: Streams
>          Issue Type: Bug
>            Reporter: Ryan Ebanks
>
> Adding DatumCountable to a streams component leads to casting errors when the 
> stream is ran.  The errors kill the component 



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