NAS Metadata Lock Coordination for Concurrent Proxy Access
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Solution Overview
Problem
Inconsistent metadata between a proxy node and a NAS cluster due to concurrency of file access operations leads to excessive hardware resource consumption and inconsistency issues.
Innovation Solution
Implementing a distributed data storage control method that includes determining target metadata synchronization with a distributed lock, reallocating locks through a distributed lock management and control node, and ensuring metadata consistency by configuring and managing metadata distributed locks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the proxy node caches file data from the NAS cluster to improve access speed, then access efficiency is improved, but data inconsistency occurs between the proxy node and the NAS cluster due to concurrent modifications
Solution Approach 1:
The patent introduces a distributed lock management and control node as an intermediary between the proxy node and the NAS cluster. This mediator coordinates access to metadata by managing distributed locks, ensuring that the proxy node only caches metadata when no other node is actively modifying it, thus preventing data inconsistency while maintaining caching benefits
Solution Approach 2:
The system implements a feedback mechanism where the proxy node continuously monitors the validity of cached metadata by checking distributed lock status. When lock status changes indicate metadata modifications, the proxy node receives feedback to invalidate or update its cache, ensuring consistency without requiring continuous active caching
2Productivity
If the proxy node directly accesses the NAS cluster without distributed lock control, then access concurrency is high, but metadata inconsistency occurs across multiple proxy nodes
Solution Approach 1:
The patent segments the metadata access control into fine-grained distributed locks for different metadata items rather than using a single global lock. This allows multiple proxy nodes to concurrently access different metadata items simultaneously while maintaining consistency for each individual metadata item, thus preserving high concurrency while ensuring metadata consistency
3Reliability
If distributed locks are implemented for all metadata access, then metadata consistency is ensured, but system complexity and overhead increase
Solution Approach 1:
The patent applies distributed locks selectively based on local quality requirements - only for metadata items that require consistency guarantees, while allowing other metadata to be accessed without lock overhead. This differentiated approach ensures consistency where needed while minimizing system complexity and performance overhead in other areas
Data Source
AI summary
A distributed data storage control method, including: receiving, through a proxy node, an access request for a target file in a NAS cluster, and determining target metadata corresponding to the access request; determining, based on metadata of the target file and distributed lock setting information, whether the target metadata needs to be synchronously valid with a distributed lock of the target metadata; when a determination is yes, if a current distributed lock of the target metadata is invalid, sending a first lock request to a distributed lock management and control node; configuring, through such node and in response to receiving the first lock request, the distributed lock of the target metadata for the access request, and returning response information to the proxy node; and controlling, based on the distributed lock of the target metadata, the access request for the target file in the NAS cluster.