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Log Write Backpressure
429 Diagnosis Taxonomy
Backpressure Indexing Status
Log Contention Error
wal3 Backpressure ADR
Distributed Test Suite
Log Write Backpressure
v7 · updated 2h ago
The distributed log service (Rust) enforces two backpressure signals when a collection's WAL is too full or too busy — both surface as RESOURCE_EXHAUSTED gRPC errors / HTTP 429 at the public boundary. This is Layer 2 of the 429 diagnosis taxonomy.
Two backpressure variants
1 · Backoff — general write-batching pressure. “Please backoff exponentially and retry.” Carries backoff-reason metadata with any value except compaction.
2 · BackoffCompaction — the log accumulated too many uncompacted records. Carries backoff-reason: compaction. Both map toErrorCodes::ResourceExhausted.
The num_records_before_backpressure knob
Configured per environment. On 2026-03-28, production and production-aws-us-east-2 were raised from 5M → 10M (k8s#2721) — “Until we make compactions fast.”
production10,000,000
production-aws-us-east-210,000,000
all others (staging, BYOC, GCP)5,000,000
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