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https://issues.apache.org/jira/browse/NIFI-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011765#comment-15011765
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Bryan Bende commented on NIFI-1171:
-----------------------------------

More info... I put a debug statement right before line 495 if (fileLength < 
position) and printed the length and position, and when the problem happens 
such as at 11:59 in the above example, the fileLength is > position so it never 
goes into the block of code that checks for rolled files to process them.

> If a file rolls over multiple times between invocations of TailFile, 
> Processor doesn't pick up all changes
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-1171
>                 URL: https://issues.apache.org/jira/browse/NIFI-1171
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 0.4.0
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>             Fix For: 0.4.0
>
>         Attachments: 
> 0001-NIFI-1171-If-multiple-rollovers-occur-while-the-Proc.patch
>
>
> If TailFile is scheduled to run less often, say once per minute, and the file 
> that it is tailing rolls over multiple times, it does not pick up all of the 
> changes. We need to ensure that it picks up all of the changes to the log 
> file in this case.



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