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https://issues.apache.org/jira/browse/NIFI-4836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362285#comment-16362285
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ASF GitHub Bot commented on NIFI-4836:
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Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2447
@pvillard31 @joewitt @alopresto LGTM and should be an easy win to merge.
> Allow QueryDatabaseTables to send out batches of flow files while result set
> is being processed
> -----------------------------------------------------------------------------------------------
>
> Key: NIFI-4836
> URL: https://issues.apache.org/jira/browse/NIFI-4836
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Priority: Major
>
> Currently QueryDatabaseTable (QDT) will not transfer the outgoing flowfiles
> to the downstream relationship(s) until the entire result set has been
> processed (regardless of whether Max Rows Per Flow File is set). This is so
> the maxvalue.* and fragment.count attributes can be set correctly for each
> flow file.
> However for very large result sets, the initial fetch can take a long time,
> and depending on the setting of Max Rows Per FlowFile, there could be a great
> number of FlowFiles transferred downstream as a large burst at the end of QDT
> execution.
> It would be nice for the user to be able to choose to have FlowFiles be
> transferred downstream while the result set is still being processed. This
> alleviates the "large burst at the end" by replacing it with smaller output
> batches during processing. The tradeoff will be that if an Output Batch Size
> is set, then the maxvalue.* and fragment.count attributes will not be set on
> the outgoing flow files.
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