Transaction locks for high availability
US6145094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | May 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/825
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a method and an apparatus that ensures proper semantics for operations when operations are restarted on a secondary server in the event of a failure of a primary server. This embodiment keeps a record on the secondary server of which operation currently has exclusive access to a shared resource. The method operates by receiving a message from the primary server indicating that a first operation on the primary server has acquired exclusive access to the shared resource. In response to this message, the system updates state information, at the secondary server, to indicate that the first operation has exclusive access to the shared resource and that any prior operations have completed their exclusive accesses to the shared resource. Upon receiving notification that the primary server has failed, the secondary server is configured to act as a new primary server. When the secondary server subsequently receives an operation retry request from a client of the primary server, it performs one of several operations. If the operation retry request is for the first operation, the system knows the first operation had exclusive access to the shar…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.