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https://issues.apache.org/jira/browse/NIFI-2383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427028#comment-15427028
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Mark Payne commented on NIFI-2383:
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When you say a watching service, do you mean have ListFile watch a directory
and be notified of changes to the directory? That could certainly be a good
approach to take, for efficiency purposes, but we have to be very careful
because we cannot rely solely on that; if NiFi restarts we will not have
received those notifications, so we will have to have a way to detect new files
after restart as well.
> ListFile does not detect new files
> ----------------------------------
>
> Key: NIFI-2383
> URL: https://issues.apache.org/jira/browse/NIFI-2383
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: n h
> Labels: ListFile
> Fix For: 0.7.1
>
>
> ListFile does not detect directory updates correctly. It seems it only check
> for file name and modified date.
> Using a 2 processors flow: ListFile -> FetchFile, and configure FetchFile to
> finally delete files. Following scenario fails:
> 1. Create file1.txt somewhere outside of watching directory.
> 2. Copy file1.txt to watching directory.
> 3. Wait for FetchFile to fetch and delete file1.txt
> 4. Copy file1.txt again to watching directory.
> In the 2nd time ListFile does not detect "new copy of the same file
> file1.txt" because file name and modified time are the same. Only creation
> time is updated.
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