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https://issues.apache.org/jira/browse/NIFI-3804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann resolved NIFI-3804.
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Resolution: Cannot Reproduce
> Resolve "too many files open" issues in tests when running full build
> multiple times
> ------------------------------------------------------------------------------------
>
> Key: NIFI-3804
> URL: https://issues.apache.org/jira/browse/NIFI-3804
> Project: Apache NiFi
> Issue Type: Bug
> Components: Tools and Build
> Affects Versions: 1.2.0
> Reporter: Andy LoPresto
> Priority: Major
> Labels: test
>
> When running the full build multiple times, tests can fail due to "too many
> files open" errors. These tests run successfully when the system is rebooted.
> I have followed configuration best practices (raising max file handles to
> 50_000) but after repeated test runs, this threshold is maxed out. This leads
> me to believe there are tests which do not clean up after themselves or
> temporary files which are not closed and deleted.
> I suggest using malware detection and analysis tools/VMs to perform a file
> system snapshot before and after a complete test run and compare to determine
> what is left open.
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