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https://issues.apache.org/jira/browse/NIFI-6219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845703#comment-16845703
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Peter Radden commented on NIFI-6219:
------------------------------------
{noformat}
2019-05-22 09:52:57,492 INFO [Timer-Driven Process Thread-5]
o.a.n.c.r.WriteAheadFlowFileRepository Successfully swapped out 10000 FlowFiles
from FlowFileQueue[id=26a73ec1-016a-1000-be52-ffe5e199e18a] to Swap File
E:\nifi-1.9.2-bin\nifi-1.9.2\.\flowfile_repository\swap\1558515177257-26a73ec1-016a-1000-be52-ffe5e199e18a-f517326d-c082-430f-8584-389dd310df8d.swap
...
2019-05-22 09:53:26,194 WARN [Timer-Driven Process Thread-3]
o.a.n.controller.FileSystemSwapManager Cannot swap in FlowFiles from location
E:\nifi-1.9.2-bin\nifi-1.9.2\.\flowfile_repository\swap\1558515177257-26a73ec1-016a-1000-be52-ffe5e199e18a-f517326d-c082-430f-8584-389dd310df8d.swap
because the FlowFile Repository does not know about this Swap Location. This
file should be manually removed. This typically occurs when a Swap File is
written but the FlowFile Repository is not updated yet to reflect this. This is
generally not a cause for concern, but may be indicative of a failure to update
the FlowFile Repository.{noformat}
The file does exist at that path.
> Unprocessable queues with remaining size a multiple of 10000
> ------------------------------------------------------------
>
> Key: NIFI-6219
> URL: https://issues.apache.org/jira/browse/NIFI-6219
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.9.2
> Reporter: Peter Radden
> Priority: Critical
> Attachments: flow.xml, processed-all-flowfiles.png, queue.jpg
>
>
> This is using all default NiFi settings.
> The problem is easy to reproduce with the attached flow:
> * Start the GenerateFlowFile processor and allow the queue to build (to say
> 100000).
> * Stop the GenerateFlowFile processor.
> * Start the UpdateCounter process.
> * Observe that it stops processing after 19999 FlowFiles. Stop the processor
> * Attempt to clear the queue.
> * Observe that the queue is left with an exact multiple of 10000 FlowFiles.
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