feat(logs): stateful gRPC log streaming with Rust pattern extraction#49342
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DDuongNguyen merged 2 commits intologs-stateful-devfrom Apr 15, 2026
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feat(logs): stateful gRPC log streaming with Rust pattern extraction#49342DDuongNguyen merged 2 commits intologs-stateful-devfrom
DDuongNguyen merged 2 commits intologs-stateful-devfrom
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Implement a stateful gRPC transport for the logs agent that extracts reusable patterns from log messages, reducing wire size by 5-10x for high-volume pipelines. Core components: - gRPC stream worker with lifecycle management, backoff, and reconnection - Protobuf-based stateful encoding (PatternDefine, StructuredLog, DictEntryDefine) - Rust DFA tokenizer via FFI (FlatBuffers zero-copy deserialization) - Drain-inspired clustering with typed tokens and signature hashing - Dual-watermark eviction for patterns and tag dictionaries - Delta encoding for timestamps, pattern IDs, and tags - JSON preprocessing to extract structured fields - Batch tokenization pipeline with non-blocking drain strategy Performance optimizations: - Hot-pattern O(1) cache for steady-state matching - Saturation scoring to skip redundant merge checks - Adaptive first-word protection with cardinality threshold - Tag input fingerprint cache (zero-alloc on cache hit) - Pre-allocated DynamicValue backing arrays - Lazy dict promotion for high-cardinality wildcard values Vendored pre-built libpatterns binaries (temporary, pending dd-source merge): - linux/amd64, linux/arm64, darwin/arm64
# Conflicts: # pkg/logs/sender/grpc/batch_strategy.go # pkg/logs/sender/grpc/stream_worker.go # pkg/proto/datadog/stateful/stateful_encoding.proto # pkg/proto/pbgo/statefulpb/stateful_encoding.pb.go # tasks/agent.py
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Dev branch for Yoon's stateful encoding work. This contains the full feature set:
See the stacked PRs for reviewable breakdown: