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https://issues.apache.org/jira/browse/NIFI-5136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16459896#comment-16459896
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ASF GitHub Bot commented on NIFI-5136:
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Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/2668
@ottobackwards I identified the leaks using VisualVM to analyze the heap,
and can now see that the processors and class loader references are no longer
in the heap after these changes
> Leaked component references preventing GC of components and class loaders
> -------------------------------------------------------------------------
>
> Key: NIFI-5136
> URL: https://issues.apache.org/jira/browse/NIFI-5136
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.6.0
> Reporter: Bryan Bende
> Assignee: Bryan Bende
> Priority: Major
>
> A user on the mailing list reported that after some time of creating/deleting
> HDFS processors, it appeared that the classes/instances were still around and
> eventually the NiFi instance would get out of memory and need to be restarted.
> After investigation there are multiple issues preventing garbage collection
> of deleted components. One issue is specific to the HDFS processors, the
> other issues are for all components...
> 1) The LogRepository still has a reference to a ComponentLogger which has a
> reference to the component
> 2) The processor scheduler has a map of scheduled states which has references
> to processors that have been deleted
> 3) The Hadoop processors start a thread that is never stopped when the
> processor is stopped/deleted, this means the class loader can't be cleaned up
> b/c the Runnable came from the InstanceClassLoader of the deleted processor
> 4) Importing a flow from registry will instantiate an instance of each
> component to ensure the incoming types are valid, but the InstanceClassLoader
> and ComponentLogger are not cleaned up for these temp instances
>
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