Failure recovery apparatus and method for distributed processing shared resource control
AssigneeInternational Business Machines Corporation
InventorsIra Richard Forman, Hari Haranath Madduri
Life of this patent
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Abstract
Communicating the failure of master process controlling one or more shared resources to all processes sharing the resources. A shared resource control file is established that contains the identities of all sharing processes. Master process failure triggers a race to establish exclusive access over the shared control file. The new master reads shadow address data from the old shared control file, marks it as invalid and establishes a new control file based on renewed registrations from the sharing processes. The master process maintains the sharing process list as process begin and end sharing.
Claims3
A computer program product having a computer readable medium having computer program logic recorded thereon for causing a computer system to detect a master process failure in system having a plurality processes each controlled by a separate operating system and a plurality of shared resources each controlled by a master process and to notify all other processes of master process failure, the computer program product comprising:
- program product means for causing said computer system to detect failure of a master process for a shared resource;
- program product means for causing said computer system to request exclusive access to a shared resource control file using a network file management system procedure independent of said operating system for said processor;
- program product means for causing said computer system to establish exclusive access to said shared resource control file, if said request is granted;
- program product means for causing said computer system to determine from said control file the communications addresses of all other processes accessing said shared resource via the failed master process;
- program product means for causing said computer system to invalidate said control file;
- program product means for causing said computer system to send a message to each of said other processes indicating failure of said master process.
Dependencies are inferred from the claim text.