Optimistic recovery in a distributed processing system
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United States of America Patent
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May 12, 1987
Grant Date -
N/A
app pub date -
Feb 1, 1985
filing date -
Feb 1, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a distributed system whose state space is partitioned into recovery units, wherein recovery units communicate by the exchange of messages and wherein a message received by a recovery unit may causally depend on other recovery units having received prior messages, a method of recovering from failure of any number of recovery units in the system comprising the steps of: (a) tracking the dependency of each message received by a recovery unit in terms of the causative messages received by other recovery units in the system; and (b) restoring all recovery units to a consistent system-wide state after recovery unit failure by means of the tracked message dependencies.
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