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[jira] [Created] (ARROW-2558) [Plasma] avoid walk through all the objects when a client disconnects


Zhijun Fu created ARROW-2558:
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             Summary: [Plasma] avoid walk through all the objects when a client disconnects
                 Key: ARROW-2558
                 URL: https://issues.apache.org/jira/browse/ARROW-2558
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Plasma (C++)
            Reporter: Zhijun Fu


Currently plasma stores list-of-clients in ObjectTableEntry, which is used to track which clients are using a given object, this serves for two purposes:
- If an object is in use.
- If the client trying to abort an object is the one who created it.

A problem with list-of-clients approach is that when a client disconnects, we need to walk through all the objects and remove the client pointer from the list for each object.

Instead, we could add a reference count in ObjectTableEntry, and store list-of-object-ids in client structure. This could both goals that the original approach is targeting, while when a client disconnects, it just walk through its object-ids and dereference each ObjectTableEntry, there's no need to walk through all objects.



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