Patent attributes
A system and method of detecting cache inconsistencies among distributed data centers is described. Key-based sampling captures a complete history of a key for comparing cache values across data centers. In one phase of a cache inconsistency detection algorithm, a log of operations performed on a sampled key is compared in reverse chronological order for inconsistent cache values. In another phase, a log of operations performed on a candidate key having inconsistent cache values as identified in the previous phase is evaluated in near real time in forward chronological order for inconsistent cache values. In a confirmation phase, a real time comparison of actual cache values stored in the data centers is performed on the candidate keys identified by both the previous phases as having inconsistent cache values. An alert is issued that identifies the data centers in which the inconsistent cache values were reported.
