• Problem
• RocksDB on Cloud Storage
• Separated WAL directory
• Missing WALs during recovery
• Corrupted WALs during recovery
• Goal
• Design
• Overview
• User interface
• Backward compatibility
• WAL verification on recovery
• WAL Syncing
• WAL recycling
• WAL lifecycle events to track
• Design of WAL related VersionEdits
• Special handling of WAL related VersionEdits in LogAndApply