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https://issues.apache.org/jira/browse/NIFI-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard resolved NIFI-8020.
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Resolution: Fixed
> TailFile can leave FileChannel open when handling NUL characters
> ----------------------------------------------------------------
>
> Key: NIFI-8020
> URL: https://issues.apache.org/jira/browse/NIFI-8020
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.13.0
> Reporter: Tamas Palfy
> Assignee: Tamas Palfy
> Priority: Major
> Fix For: 1.13.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In TailFile when REREAD_ON_NUL is set to 'true' and a NUL character is
> encountered, the processor aborts all processing and yields to try again
> later.
> However the opened FileChannel is not stored in the states. Because of this
> the reader is not cleaned up later.
> On Windows this prevents from deleting the tailed file. (On linux it seems
> the file still can be deleted. Leaving open the FileChannel is not good
> nonetheless.)
> Fix: Store the reader in the states.
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