Chronicle

Modern distributed indexed streaming system.

Features

• Streaming API — Simple record and fetch operations
• Key-based compaction — Retain latest value per key for changelog and state snapshot workloads
• Secondary offset — Look up events by both primary offset and secondary index
• Transactions — Atomic writes across multiple keys
• Native schema — Schema enforcement built into the core
• Replication — Full replication with all-ack durability guarantee
• Auto rebalancing — Seamless cluster scaling without downtime
• Placement policies — Rack-aware and zone-aware replica placement
• Native offloading — Tiered storage with automatic offload to object store
• TLA+ verified — Formal verification for correctness
• Rust core, C ABI — Built in Rust, exposes C ABI for multi-language bindings