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https://issues.apache.org/jira/browse/NIFI-13914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-13914:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
> Stateless not honoring ProcessSession.transfer ordering
> -------------------------------------------------------
>
> Key: NIFI-13914
> URL: https://issues.apache.org/jira/browse/NIFI-13914
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 2.0.0-M1, 2.0.0-M2, 2.0.0-M3, 2.0.0-M4
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 2.0.0-M5
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Occasionally a Processor operates on a batch of FlowFiles instead of a single
> FlowFile. If it transfers the FlowFiles in a particular order, the Process
> Session is not honoring that ordering in stateless, which can result in the
> next processor receiving the data in the wrong order. For example, a source
> Processor might receive two FlowFiles in a single session and transfer the
> first, then the second, using `ProcessSession.transfer(FlowFile,
> Relationship)`. In this case, the ProcessSession properly updates the last
> queue date/index. But when the FlowFiles are transferred to the next
> StatelessFlowFileQueue, they are not provided in any particular order, and
> the stateless flowfile queue simply adds them in whatever order the given
> Collection iterates over them. This results in data being improperly
> re-ordered within a Stateless execution.
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