Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/1156
@olegz thanks for reviewing, I posted a couple of replies to the inline
comments.
I also wanted to mention that after submitting this PR, I realized that a
slight modification to the approach might open this feature up to a wider
variety of use cases...
In the current PR, when the component is annotated with
@RequiresInstanceClassLoading it creates an InstanceClassLoader which copies
all of the URL resources from the NAR ClassLoader. This was necessary to solve
the HBase + Phoenix problem, but it many other cases it may be acceptable to
just make a new InstanceClassLoader with a parent of the NAR ClassLoader.
So I started working on a change where every single processor, cs,
reporting task will get an InstanceClassLoader and by default it will be empty
and have a parent of the NAR ClassLoader. Only components with the
@RequiresInstanceClassLoading will force a full copy of the resources.
This should lets the HBaseControllerService use
@RequiresInstanceClassLoading, and other components can still have properties
that modify the classpath without making full copies.
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