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Correct Handling of Segmented Files During Automatic Recovery

10 June 2009

Affected Builds: All builds prior to 090610
Criteria: Segmented file, Automatic recovery after a failed c‑treeACE Server process
Indications: Renamed file segments

During automatic recovery of a failed c‑treeACE process, existing file segments were renamed and thus subsequently not available to the application resulting in apparent missing data. During recovery, an attempt is made to open all segments of a segmented file found in the transaction logs. To open the segments, the segment definition resource must be read from the primary segment. However, an internal file map attribute had not been initialized resulting in a failed call. This failed call caused the recovery process to believe the additional segments did not exist. When later attempting to create the file segment, and that segment already existed, c‑treeACE then renamed the segment. The uninitialized attributes are now properly assigned avoiding this potential incorrect renaming of segmented files.

FairCom customers on current maintenance can request an updated V9 server line at any time. Please contact your nearest FairCom office should you have any concerns that you are impacted by this update.

For over fifteen years National Public Radio has controlled and managed its entire satellite network radio broadcasts with an application built by Chesapeake Computer Group with FairCom's database technology. This system controls audio routing switchers, makes contact closures for tape recording machine starts and On-Air and Warning lights, controls transmitter parameters, digital audio storage systems and other devices required to operate its broadcasting network.

FairCom's technology provides the performance and stability required to capture and process the data used to operate and control an international satellite communications system. An application such as this requires absolute assurance that its database will provide the accuracy, data integrity, stability and performance required by the most demanding mission-critical embedded technology. In addition, FairCom's portability and scalability has allowed the NPR broadcast network to expand and move into the full international position it occupies today, providing radio network programming to every US military facility and many other international organizations world wide.

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