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https://issues.apache.org/jira/browse/NIFI-10404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tamas Palfy resolved NIFI-10404.
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Fix Version/s: 1.18.0
Resolution: Fixed
> TailFile processor's persistent state not cleaned up
> ----------------------------------------------------
>
> Key: NIFI-10404
> URL: https://issues.apache.org/jira/browse/NIFI-10404
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Zsihovszki Krisztina
> Assignee: Zsihovszki Krisztina
> Priority: Major
> Fix For: 1.18.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> TailFile processor's persistent state map is not maintained properly, entries
> are added to this map but the references to non existent files are not moved
> from the map.
> At NiFi restart the states map (storing the TailFileObjects) is empty and it
> is
> [filled|https://github.com/hortonworks/nifi/blob/CFM-2.0.4.0/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java#L360]
> with entries based on the persistent state map.
> Each TailFileObject contains a byte buffer with the size of 65536 bytes.
> Since the persistent state map is not cleaned up and it may contain thousands
> of file references, a lot of TailFileObject may be created at startup, each
> consuming 65536 bytes which can end up in out of memory error.
> The persistent state map needs to be actualized based on the actual files as
> it is done for the [states
> map|https://github.com/hortonworks/nifi/blob/CFM-2.0.4.0/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java#L374].
> The allocated byte buffer size (65536 bytes) should be configurable to be
> able to use smaller buffer size (default value would be 65536 bytes for
> backward compatibility).
>
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