David Li created ARROW-6867:

             Summary: [FlightRPC][Java] Flight server can hang JVM on shutdown
                 Key: ARROW-6867
                 URL: https://issues.apache.org/jira/browse/ARROW-6867
             Project: Apache Arrow
          Issue Type: Bug
          Components: FlightRPC, Java
    Affects Versions: 0.15.0
            Reporter: David Li
            Assignee: David Li
             Fix For: 1.0.0

I noticed this while working on Flight integration tests. FlightService keeps 
an executor, which can hang the JVM on shutdown if the executor itself is not 
shut down.

It's used by Handshake and DoPut.

I think this surfaced because I wrote an AuthHandler that threw an exception.

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