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https://issues.apache.org/jira/browse/NIFI-8102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17251963#comment-17251963
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ASF subversion and git services commented on NIFI-8102:
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Commit 31c5dc5ab41ebf909b7512154e7519d22936bf89 in nifi's branch
refs/heads/main from Denes Arvay
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=31c5dc5 ]
NIFI-8102 TailFile can skip characters if tailing a file on NFS mount
- Force the TailFile processor to recreate and reposition the reader
by setting it to null in case of a NulCharacterEncounteredException
- Updated the TestTailFile.testNULContent() to not initialize the
processor when calling the second run()
Update the reader's position instead of abandoning it.
This closes #4736.
Signed-off-by: Mark Payne <[email protected]>
> TailFile can skip characters if tailing a file on NFS mount
> -----------------------------------------------------------
>
> Key: NIFI-8102
> URL: https://issues.apache.org/jira/browse/NIFI-8102
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Denes Arvay
> Assignee: Denes Arvay
> Priority: Major
> Time Spent: 40m
> Remaining Estimate: 0h
>
> As explained in NIFI-7972 on an NFS mount files can have temporary dummy data
> of {{NUL}} bytes. This was addressed at that Jira but the implementation
> contains a bug that can lead to characters skipped when encountering NUL
> bytes.
> The root cause is that the reader ({{FileChannel}}) is not repositioned
> properly. This wasn't discovered by the newly added unit tests because the
> second {{run}} call (after the simulated {{NUL}} byte replacement) was also
> called with {{initialize = true}} parameter, so the respective {{reader}} was
> reinitalized and repositioned. See [1]
> [1]
> https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/java/org/apache/nifi/processors/standard/TestTailFile.java#L198
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