System and method for maintaining replicated data coherency in a data processing system
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United States of America Patent
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Jul 18, 1995
Grant Date -
N/A
app pub date -
May 23, 1994
filing date -
May 23, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for maintaining data coherency in a system in which data is replicated on two or more servers. Each server is able to update the data replica present on the server. Updates are logged for each server. Reconciliation of server data replicas is aggressively initiated upon the occurrence of predefined events. These events include arrival at a scheduled time, a request for data by a client system, server and network failure recovery. Reconciliation is managed by a coordinator server selected to ensure that at most one coordinator server per network partition is selected. Logged updates are merged and transmitted to each server containing a data replica. The logged updates are applied unless a conflict is detected. Conflicts are collected and distributed for resolution. Reconciliation is managed between servers without regard to operating system or physical file system type.
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