Distributed System Upgrade Scenarios
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This upgrade adds invalidation messages to Thor. Servers send invalidations to FEs when an object they have read is modified by a committing transaction. FEs acknowledge invalidations once they have removed all invalid objects from their cache and aborted all transactions that read the invalid objects. When a server receives an ack, it removes the acked object from the set of outstanding invalidations for that FE.
[1] Miguel Castro,et al. Providing Persistent Objects in Distributed Systems , 1999, ECOOP.