[jira] [Created] (NIFI-8102) TailFile can skip characters if tailing a file on NFS mount

["Denes Arvay (Jira)" <ji...@apache.org>]

Denes Arvay created NIFI-8102:
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             Summary: 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


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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