[STRATOS-97] Load Balancer Architectural Changes for Stratos 4.0.0

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0 Alpha
• Fix Version/s: 4.0.0
• Component/s: Load Balancer
• Assignee: Imesh Gunaratne
• Reporter: Imesh Gunaratne
• Created: 12/Oct/13 06:18
• Updated: 03/Apr/14 13:23
• Resolved: 03/Apr/14 13:23

Description

According to the proposed architecture for Stratos 4.0.0 release, Stratos Load Balancer is expected to be light-weight and loosely coupled with Stratos core & underlying Apache Synapse components. As a result we could extract out components and data structures which might be common to any other load balancer if we were to integrate a third party load balancer with Stratos.

In-addition Stratos Load Balancer is expected to support following major features:
1. Session Management
2. Load Balancing Algorithms
3. Statistics Reporting
4. State Replication for Clustering
5. Domain Mappings

This task was created for achieving the above goal using sub tasks.

Sub-Tasks

• Implement Topology Event Processors: Resolved
• Implement Synapse Load Balancing Endpoint: Resolved
• Implement Load Balancing Algorithm Interface and Round Robin Implementation: Resolved
• Load Balancing Statistics Reporting Interface and its implementation for CEP: Resolved
• Support Domain Mappings for Cartridge Subscriptions: Resolved
• Implement Support for Multi-Tenancy: Resolved
• Improve Log Messages of Topology Event Processors: Resolved
• Improve Error Messages Returned to Client: Resolved
• Refactor Load Balancer Endpoint Component: Resolved
• Remove Obsolete Component Lb.Agent: Resolved
• Implement Load Balancer Extension API: Resolved
• A Reference Load Balancer Extenaion API Implementation for HAProxy: Resolved
• Implement Load Balancing Statistics Publishing in HAProxy Extension: Resolved
• Introduce an Interface in Load Balancer Extension API for Statistics Publishing: Resolved
• Add An Optimized Data Structure to Load Balancer Context to Fetch Cluster Information: Resolved
• Support Dedicated Load Balancing for Services: Resolved
• Investigate Session Management: Resolved
• Add Functionality to Enable/Disable Load Balancing Statistics Publisher: Resolved
• Terminate Load Balance Endpoint Fault Handling Sequence if None of the Members could Serve the Request: Resolved
• Support Dedicated Load Balancing for Subscriptions: Resolved
• Implement Load Balancer Static Configuration: Resolved
• Expose Load Balancing Statistics to a File or Socket: Open
• Load Balance Algorithm Context Cache for Clustering: Resolved
• Add Support to Manage Multiple Hostnames per Cluster: Closed
• Publish Fault Request Messages to CEP: Open
• Create Load Balancer Cartridge Scripts: Resolved
• Add Partition ID to Load Balancer Statistics Published to CEP: Resolved