Storage Server Lock Recovery via Alternate Client Links
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Solution Overview
Problem
The challenge of implementing lock recovery when a link between a client and a storage server is disconnected, leading to data inconsistency and reduced system reliability due to failed lock recovery attempts.
Innovation Solution
Establish direct links between multiple storage servers and a client, allowing lock recovery requests to be sent through alternative links if the primary link fails, ensuring successful re-locking of data to prevent data inconsistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lock recovery request is sent through a specific link between storage server and client, then the link utilization is improved, but the reliability of lock recovery deteriorates when the link is faulty
Solution Approach 1:
The patent segments the communication path by establishing multiple independent links between storage servers and clients. Instead of relying on a single link, the system divides the communication channel into multiple segments (links), allowing lock recovery requests to be transmitted through alternative segments if one link fails, thereby improving lock recovery reliability while maintaining efficient link utilization.
2Reliability
If multiple links are established between storage servers and client, then the success probability of lock recovery is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing storage servers that can perform multiple functions: normal data storage, lock management, and lock recovery request transmission. The same storage server infrastructure is utilized for multiple purposes, including serving as an alternative transmission path for lock recovery requests, thereby improving lock recovery success probability without proportionally increasing device complexity.
3Reliability
If lock recovery is implemented after server restart, then system reliability is improved, but the time required for data consistency recovery increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing multiple communication links between storage servers and clients before any failure occurs. These redundant links are prepared in advance, so when a server restarts and lock recovery is needed, the system can immediately utilize the pre-configured alternative links without time-consuming link establishment, thus reducing lock recovery time while maintaining data consistency.
Data Source
AI summary
A lock recovery method includes locking, by a first storage server, target data based on a first lock request from a client. After the first server is restarted, the first server sends a lock recovery request to the client through a link between any one of a plurality of servers and the client, to indicate the client to recover locking on the first server. Further, the first server receives a second lock request sent by the client, and re-locks the target data indicated by the second lock request.