Sergey Shelukhin created TEZ-3815:

             Summary: allow plugins to be aware of each other
                 Key: TEZ-3815
             Project: Apache Tez
          Issue Type: Bug
            Reporter: Sergey Shelukhin

Given that many sets of plugins (e.g. LLAP) come as a package deal and do not 
work without each other, it would make sense for them to be aware of each 
Not sure yet of the best way for this to work, we probably don't want too much 
complexity, dependency systems, etc. Perhaps after all the plugins are 
initialized fully, an optional-to-implement call could be made to each of them 
passing a map from plugin type (communicator, scheduler, etc.) to the instance 
that is going to be used for this DAG.

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