Mark Payne created NIFI-8054:
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Summary: When components are removed from flow, their class
loaders are not cleaned up
Key: NIFI-8054
URL: https://issues.apache.org/jira/browse/NIFI-8054
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Reporter: Mark Payne
Assignee: Mark Payne
When a component is removed from the flow, its corresponding
classes/classloaders are not removed from the JVM's count of loaded classes.
This can be seen by creating a Process Group with several processors that use
the @RequiresInstanceClassLoading annotation (GetHDFS, for example). Then use a
profiler/JConsole/etc. to see how many classes are loaded into memory. After
the Process Group is deleted and GC is performed, the number of classes loaded
should drop significantly. Currently, it does not. So if instantiate a
template, delete the Process Group, instantiate it again, delete it again, etc.
then I get into a situation where I run out of memory and see OutOfMemoryError:
GC overhead limit exceeded.
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