Default[Source|Sink|Channel]Factory implementation should do reference counting
for create/unregistering instances.
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Key: FLUME-933
URL: https://issues.apache.org/jira/browse/FLUME-933
Project: Flume
Issue Type: Bug
Reporter: Arvind Prabhakar
The current implementation of DefaultSourceFactory, DefaultSinkFactory and
DefaultChannelFactory ensures that if a create() is called for the same name
and type of object, it returns the previously created instance where available.
However, on deregister it directly removes the created object from cache. This
can lead to multiple instances of same name to exist within the VM which in
turn can cause other problems.
Instead if the factory implementation does reference counting, it will be able
to ensure that the purge of an object happens only when the number of
unregister calls matches the create calls.
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