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https://issues.apache.org/jira/browse/NIFI-5642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17796476#comment-17796476
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André Gomes Lamas Otero commented on NIFI-5642:
-----------------------------------------------

[~mattyb149] check the logic at AbstractCassandraProcessor. It is precisely 
what you are describing. 
The code updates from levilentz ([https://github.com/apache/nifi/pull/6848)] 
were made on top of the old 2018 history, thus the misleading commit messages 
from the old history.

> QueryCassandra processor : output FlowFiles as soon fetch_size is reached
> -------------------------------------------------------------------------
>
>                 Key: NIFI-5642
>                 URL: https://issues.apache.org/jira/browse/NIFI-5642
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.7.1
>            Reporter: André Gomes Lamas Otero
>            Assignee: Levi Lentz
>            Priority: Major
>             Fix For: 2.0.0-M1, 1.22.0
>
>          Time Spent: 4h 10m
>  Remaining Estimate: 0h
>
> When I'm using QueryCassandra alongside with fetch_size parameter I expected 
> that as soon my reader reaches the fetch_size the processor outputs some data 
> to be processed by the next processor, but QueryCassandra reads all the data, 
> then output the flow files.
> I'll start to work on a patch for this situation, I'll appreciate any 
> suggestion.



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