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[jira] [Created] (ARROW-2551) [Plasma] Improve notification related code

Zhijun Fu created ARROW-2551:

             Summary: [Plasma] Improve notification related code
                 Key: ARROW-2551
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Plasma (C++)
            Reporter: Zhijun Fu

This change addresses two issues in plasma notification code:
 # Currently plasma store uses recv_fd to receive the notification fd from client. As mentioned in comments from the code, this could cause plasma store to hang if client doesn't call send_fd. This particular change puts the notification fd in SubscriptionRequest to solve the problem.
 # When a client subscribes to plasma store, the store pushes notifications of existing objects to ALL subscribers - while in this case it just needs to push to the new subscriber. This change adds a new interface to push to a particular client.

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