Fault-tolerant patching system

Details Fault-tolerant patching system Fault-tolerant patching system

2011-03-15

2011-03-15

Zhen, Wei Y (Department: 2191)

Data processing: software development, installation, and managem

Software upgrading or updating

C717S174000

Reexamination Certificate

active

07908600

ABSTRACT:
Techniques that promote a fault-tolerant patching system are described. According to one such technique, a patching operation is performed in two phases. During the first phase, before the updates specified in the patching operation are actually applied, an attempt is made to backup files, or portions thereof, which are going to be updated by the patching operation. If a failure is detected during the first phase, then the patching operation aborts without proceeding to the second phase. During the second phase, an attempt is made to perform the updates that the patching operation specifies. If a failure is detected during the second phase, then all of the updated files, or portions thereof, are restored; those files or file portions are replaced with their corresponding backed-up copies, which were made during the first phase. The foregoing technique is extensible to a system in which prospectively affected files are distributed among nodes.

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