Process Identifier Cache Invalidation for Data Consistency
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Solution Overview
Problem
In data center environments, the movement of processes between physical machines can lead to data inconsistency and inefficient resource utilization due to the challenges of maintaining data consistency and managing cache resources across separate machines, especially with non-volatile caching devices like FLASH-based devices.
Innovation Solution
A method that associates persistently stored data with a process identifier, allowing for automatic invalidation and reclamation of cached data when the process moves or terminates, using process identifiers to generate a key value that maps logical addresses and enables instantaneous invalidation of cache entries, thus preventing the use of 'stale' data and optimizing cache resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If processes are allowed to move between physical machines, then load balancing and resource utilization are improved, but data consistency and cache coordination become problematic
Solution Approach 1:
The cache system automatically invalidates entries when processes migrate by monitoring process identifiers (PIDs) associated with cache entries. When a PID changes or terminates, the system self-manages cache invalidation without external intervention, maintaining data consistency while allowing process migration.
Solution Approach 2:
The system implements feedback mechanisms where cache entries include PID information that is monitored and updated. When process migration is detected through PID changes, the system receives feedback and automatically invalidates stale cache entries, ensuring data consistency across dynamic process movements.
2Speed
If local data caches are used within physical servers, then access latency is minimized, but cache coordination becomes impossible when processes migrate between servers
Solution Approach 1:
Each cache entry automatically tracks its associated process identifier, and the system self-manages invalidation by monitoring PID changes. This eliminates the need for complex centralized coordination between caches on different servers, reducing overall system complexity while maintaining fast local access.
3Reliability
If non-volatile cache devices are used, then data persistence is improved, but cache invalidation becomes more difficult when processes terminate or migrate
Solution Approach 1:
The system incorporates PID information directly into cache entry metadata, creating a feedback mechanism where the cache system can detect when processes terminate or migrate. This automated feedback approach simplifies invalidation of non-volatile cache devices compared to manual coordination methods.
4Measurement precision
If cache resources are allocated to individual processes, then resource allocation precision is improved, but administrative overhead increases due to manual partitioning and assignment
Solution Approach 1:
The cache system automatically associates entries with process identifiers and manages allocation without manual intervention. When processes start, stop, or migrate, the system self-adjusts cache allocation by invalidating and reallocating entries based on PID changes, eliminating administrative overhead while maintaining precise resource allocation.
Data Source
AI summary
A method for utilizing process identifiers to invalidate cached data is disclosed herein. The invention is a method for associating persistently stored data with an identifier of the process which created it, such that when the process that created the data is no longer present on the machine where the data is stored the data may be marked as invalid to prevent the use of “stale” data.