Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Patent
1997-06-30
2000-10-24
Sheikh, Ayaz R.
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
714 40, 714 41, 714 42, 714748, 703303, 703203, 703224, 703239, 711 1, 711101, 711170, 711196, 712 28, H02H 305
Patent
active
061382515
ABSTRACT:
The present invention pertains to a system and method for tracking object references in an object-oriented computing system including a number of independent computing nodes interconnected by a communications link. The reference counting mechanism tracks references to an object through the use of a messaging protocol. A server node keeps a foreign reference count for each of its objects. The foreign reference count indicates the number of remote nodes having a reference to one of the servers objects. A server node increments the foreign reference count for each object reference that it exports prior to sending it to an intended client node. A client node will send a message to the server node when it has already received the exported object reference and in response to this message, the server node decrements the appropriate foreign reference count. When a client node receives an object reference from another client node, the receiving client node will message the appropriate server node that the receiving client node has a reference to the object. In response, the server node increments the appropriate foreign reference count. The reference counting mechanism utilizes a node failure protocol in order to accurately track the foreign reference counts in light of node failures.
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Bernabeu-Auban Jose
Khalidi Yousef A.
Murphy Declan J.
Talluri Madhusudhan
Tucker Andrew G.
Backer Firmin
Sheikh Ayaz R.
Sun Microsystems Inc.
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