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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