Goals

• Improving performance of single Tephra Transaction Server
• Make Tephra Transaction server scale horizontally
• Make Tephra Transaction server Highly Available (HA) with Isolation
• Improve operational aspects of Transaction Server
• Improve performance of Workflow scheduling to schedule 1000s of jobs / second

Areas of Focus

• Transaction Invalid List Management
• Tephra Single Server Performance Improvements
• Isolation and Scalability of Tephra Transaction Server
• Improving scheduling performance of Workflow system

High Level Requirements

Transaction Invalid List Management

• System should automatically handle pruning of the transaction invalid list
• Reduce operational complexity for running manual steps to prune invalid transaction list
• Applied during major and striped compaction
• Metrics around the current invalid list size
• Tool to inspect the invalid list

Tephra Performance Improvement

• Single Tephra Server should be able to support up-to ~ 10K transactions/second
• Support read-only and hierarchical conflict detection

Scale and Isolation

• Run multiple instances of Tephra Transaction Server in active-active in single DC or multiple DC
• Isolation at namespace level 

Technical Breakdown

P&S-001 : Invalid List Pruning with major compaction

P&S-002 : Tool to inspect Invalid List

P&S-003 : Performance improvements of Single Transaction Server

P&S-004 : Transaction Server per namespace for Resource Isolation

P&S-005 : Support for running multiple instance of Transaction Server in Active-Active mode

P&S-006 : Invalid List Pruning with striped compaction

Open Questions

Action Items