TCP Connection Migration via Connection Filters
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Solution Overview
Problem
Centralized computing systems face challenges in load balancing due to difficulties in migrating applications from one machine to another while maintaining connections with remote applications, leading to inefficient resource utilization.
Innovation Solution
A method for migrating TCP connections between computing nodes by establishing, pausing, and reestablishing connections using connection filters and daemons, which maintain and restore the connection state, including virtual IP addresses and snapshot management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If applications are migrated from one machine to another for load balancing, then resource utilization is improved, but connection continuity with remote applications deteriorates
Solution Approach 1:
The system segments the connection management by introducing connection filters that separate the application layer from the network layer. The connection filter on the source machine captures outgoing connections, extracts connection information, and forwards it to the destination machine, enabling independent migration of applications without disrupting the connection state.
Solution Approach 2:
Connection filters act as intermediaries between applications and the network. The filter intercepts connection requests, processes connection information, and maintains connection state independently of application location. This intermediary mechanism allows applications to be migrated while the filter ensures continuous connection management.
2Reliability
If connections are maintained during application migration, then connection continuity is improved, but system complexity increases
Solution Approach 1:
The connection filter operates autonomously to manage connections during migration. It automatically captures connection information, determines destination machines based on load conditions, and forwards connection state without requiring application-level intervention. This self-service approach maintains connections while avoiding the complexity of coordinated multi-component protocols.
3Productivity
If load balancing is implemented in centralized computing systems, then system efficiency is improved, but difficulty in maintaining connections increases
Solution Approach 1:
The connection filter performs preliminary actions by capturing and preserving connection information before the application is migrated. It stores connection state in advance, allowing the application to be moved to a different machine without establishing new connections. This preliminary capture of connection state simplifies load balancing by decoupling connection management from application location.
Data Source
AI summary
A method is provided for migrating a connection between two computing nodes of a computing center. The method includes establishing the connection between a remote application and a local application on a first computing node, pausing the local application, restoring the local application to a second computing node, and reestablishing the connection between the remote application and the local application on the second computing node. A connection filter on the first computing node can maintain connections while the local application is paused. An application scheduler routine can cause the application to be restored on the second computing node where a second connection filter obtains connection information and reestablishes the connection to the remote application.