Yahoo! Inc.

Prashant T R Rao

Ilya Slain

Prabhakar Goyal

Jatin Patel

Systems and methods for acquiring, releasing, and reclaiming a lock of a data structure in a network file system ('NFS') are discussed. Generally, a text file is created in a management library of the data structure. The name of the text file includes an identifier of the lock, an identifier of a process attempting to acquire the lock, and an identifier of a machine on which the process attempting to acquire the lock is running. The identifier of the process attempting to acquire the lock and the identifier of the machine on which the process attempting to acquire the lock is running are is saved in the contents of the text file and a hard line is created pointing to the text file. Finally, a lock of the data structure is granted based on a number of links pointing to the text file.

System and method for resource lock acquisition and reclamation in a network file system environment

A system and method for automated recovery of processing of a unit of work during an error in a batch processing system is disclosed. Generally, at least a portion of a unit of work and instructions of operations to perform to process the portion of the unit of work is sent to a worker data structure. A periodic heartbeat is received from the worker data structure indicating the worker data structure is processing the at least a portion of the unit of work. If an unexpected termination of the worker data structure is detected, a signal is sent to a crash handler data structure instructing the crash handler data structure to detect and store a current input location of the at a portion of the unit of work. The records from the current location at the crash are skipped during reprocessing of the unit of work to increase the chances of success during reprocessing.

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Sunnyvale, CA, United States of America

Prashant T R Rao