# Chainfire Feature Gap Analysis

**Date**: 2025-12-08
**Implementation Status**: 62.5% (20/32 features)

## Summary

Core KV operations working. Critical gaps in etcd compatibility features.

## Gap Analysis

| Feature | Spec Section | Priority | Complexity | Notes |
|---------|--------------|----------|------------|-------|
| Lease Service | 5.3 | P0 | Medium (3-5 days) | No gRPC Lease service despite lease_id field in KvEntry. No TTL expiration worker. |
| Read Consistency | 5.1 | P0 | Small (1-2 days) | No Local/Serializable/Linearizable implementation. All reads bypass consistency. |
| Range in Transactions | 5.2 | P0 | Small (1-2 days) | Returns dummy Delete op (kv_service.rs:224-229). Blocks atomic read-then-write. |
| Transaction Responses | 5.2 | P1 | Small (1-2 days) | TODO comment in code - responses not populated. |
| Point-in-time Reads | 5.1 | P1 | Medium (3-5 days) | Revision parameter ignored. |
| StorageBackend Trait | 5.4 | P1 | Medium (3-5 days) | Spec defines but not implemented. |
| Prometheus Metrics | 9 | P1 | Small (1-2 days) | No metrics endpoint. |
| Health Checks | 9 | P1 | Small (1 day) | No /health or /ready. |

## Working Features

- KV operations (Range, Put, Delete)
- Raft consensus and cluster management
- Watch service with bidirectional streaming
- Client library with CAS support
- MVCC revision tracking

## Effort Estimate

**P0 fixes**: 5-8 days
**P1 fixes**: 10-15 days
**Total**: ~2-3 weeks focused development