Scheme to determine completion of directory operations for server recovery
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United States of America Patent
Stats
-
Aug 19, 1997
Grant Date -
N/A
app pub date -
Jun 16, 1994
filing date -
Jun 16, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a fault-tolerant distributed file system, the server state needs to be reconstructed after the server restarts or when its function is taken over by another node. A crucial part of the server state is determining whether or not in-flight, directory-operations initiated by the clients have been completed. Described is a check-before-request scheme that solves this problem. A global lock is obtained on the directory or directories first. A check is made on the directories to see if the operation would succeed, and if so a request is made to the server for the operation. If the server were to fail during the execution of the operation, completion of the operation prior to failure can be determined by merely re-examining the directory contents.
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