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https://issues.apache.org/jira/browse/NIFI-4602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250246#comment-16250246
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Matthew Clarke commented on NIFI-4602:
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Need to verify what happens when a log rolls. Will the new primary node be
able to pick up by grabbing lines from rolled log or will it just start tailing
the latest log?
> TailFile does not recover cluster-wide state when Primary Node changes
> ----------------------------------------------------------------------
>
> Key: NIFI-4602
> URL: https://issues.apache.org/jira/browse/NIFI-4602
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Mark Payne
>
> I created a TailFile processor and set the "File Location" property to
> "Remote." I then added some text to a file and started the TailFile processor
> (Primary Node Only).
> I disconnected the primary node from the cluster. A second node became the
> new Primary Node and continued tailing the data as expected. As new data was
> added, the node continued to emit FlowFiles.
> Then, I added Node 1 back to the cluster. Verified that Node 2 continued to
> poll data. I then disconnected Node 2 so that Node 1 once again became the
> Primary Node. At this point, Node 1 continued tailing from where it last left
> off, not where Node 2 left off.
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