Write-Only Cache Warming for Distributed Node Replacement

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Solution Overview

Problem

In distributed data storage systems, cache nodes becoming unavailable or undergoing destructive events lead to cache data loss, resulting in downtime, decreased efficiency, and increased network hops for data access, which degrades system performance.

Innovation Solution

A zero downtime cache warming process that allocates new cache data nodes in write-only mode, streams existing data to these nodes while continuing to service data access requests, and verifies the new nodes before switching to them, ensuring seamless transition without downtime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If cache nodes are shut down for recycling or replacement, then system maintenance and updates can be performed, but cache data is lost and system performance degrades during the warming period

Engineering Contradiction:

Improvecache node maintenanceVSAvoiddata access efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The system performs preliminary actions by allocating new cache nodes and streaming cache data to them before the old nodes are shut down. This ensures that when the old nodes are replaced, the new nodes are already warm and ready to serve requests immediately, eliminating the performance degradation that would otherwise occur during the warming period.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses an intermediary approach by maintaining both old and new cache nodes simultaneously during the transition period. The load balancer gradually shifts traffic from old nodes to new nodes, allowing the system to perform maintenance on old nodes without causing performance degradation, as requests are routed to the new warm nodes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If cache data is streamed to new nodes during node transitions, then cache availability is maintained, but additional network hops and complexity are introduced

Engineering Contradiction:

Improvecache availabilityVSAvoiddata streaming infrastructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements self-service by having the warming tool automatically stream cache data from old nodes to new nodes without manual intervention. The load balancer automatically routes warming traffic to the appropriate nodes, and the system autonomously manages the entire warming process, reducing the operational complexity despite the additional infrastructure required.

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If all data is streamed to new cache nodes before switching, then data consistency is ensured, but downtime occurs during the warming process

Engineering Contradiction:

Improvedata consistencyVSAvoidcache warming downtime

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system performs the data streaming action preliminarily, before the old cache nodes are shut down. By allocating new nodes and streaming data to them in advance, the system ensures data consistency is achieved before the transition, allowing the old nodes to be decommissioned immediately after verification without causing any downtime.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system maintains continuity of useful action by keeping the old cache nodes operational during the entire warming process. The load balancer continues to route requests to old nodes while data is being streamed to new nodes, ensuring that cache serving operations continue uninterrupted throughout the transition.

Inventive Principle:

Principle #20Continuity of useful action

4Reliability

If new cache nodes are allocated in write-only mode, then data security is enhanced during warming, but additional operational steps are required

Engineering Contradiction:

Improvedata securityVSAvoidnode management complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system changes the operational parameters of new cache nodes by allocating them in write-only mode during the warming process. This parameter change enhances data security by preventing read operations on potentially inconsistent data. After warming is complete and data consistency is verified, the node mode is changed to read-write, allowing full operational functionality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12450158B2Systems and methods for cache warming in a distributed data storage system

Publication Date: 2025.10.21 STRIPE LLC

AI summary

A method and apparatus for cache warming in a distributed storage system is described. The method can include detecting a destructive change to one or more nodes of an existing cluster of cache data nodes. The method can also include allocating a new cluster of cache data nodes in a write-only mode, and streaming data from each cache data node of the existing cluster to cache data nodes of the new cluster. The method can further include servicing a data access request from a selected cache data node of the existing cluster while writing data from the data access request to a selected cache data node of the new cluster. Furthermore, the method can include in response to a determination that data from the cache data nodes of the existing cluster has been successfully streamed to the new cluster, servicing new data access requests with the new cluster.