Goals

• Improve performance of single Tephra Transaction Server
• Scale Tephra Transaction Manager
• Replication of Write-A-Head Logs to multiple Transaction Manager
• Transaction Server Isolation

High Level Requirements

Invalid List Pruning

• Automatic pruning of invalid transaction list for Major compaction
• Pruning the list during striped compactions

Performance Improvement

• Reducing the lock granularity during conflict detection
• Supporting read-only transactions
• Improving group commit efficiency
• Support for Hierarchical conflict detection
• Support for transmitting only latest snapshot of Invalid list

Replication