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Shard 435 Crawl Experiment Plan

Goal

Run a local-only, no-publish experiment that compares the monolithic GitHub crawl with a sharded variant while enforcing:

  • at least 25% wall-clock improvement
  • no more than 10% GitHub API growth
  • no secondary-rate-limit regression
  • byte-stable downstream payloads after deterministic fan-in

Shard Boundaries

  1. Shard 1 — new-search

    • runs the new-repository search query group
    • in config mode, runs primary queries first and only falls back to secondary queries when needed

  2. Shard 2 — trending-search

    • runs the trending-repository search query group
    • skipped only when config mode intentionally has no trending bucket and must preserve existing semantics

  3. Shard 3+ — validate-N

    • consume deduplicated candidate chunks from a shared queue
    • perform README/detail validation and final filtering
    • requeue unfinished work when a shard hits its wall-clock limit so other shards can absorb the remainder

Deterministic Fan-in

  • keep new/trending buckets separate to preserve the canonical raw-artifact shape
  • dedupe within each bucket by full_name
  • sort final outputs like crawl.py
    • new repos by stars descending
    • trending repos by stars_gained, then stars descending
  • rebuild signals and star snapshots only after fan-in
  • compare canonical payload bytes after stripping volatile timestamp metadata

Guardrails

  • Wall-clock budget: each shard gets a configurable deadline (default 120s)
  • API budget: shard mode shares a global counter capped at baseline_calls × 1.1
  • Shared backoff: retry backoff windows are propagated across shard clients
  • Rollback condition: any secondary rate limit aborts remaining shard work and records a guardrail event

Assumptions

  • threading is sufficient because the workload is API I/O bound
  • cache reads are safe to share across shard clients
  • cross-bucket duplicates may still appear in both new_repos and trending_repos because the baseline crawl already allows that
  • at least three representative real runs are still required after implementation

Output Artifacts

All experiment artifacts stay under data/experiments/shard-435/EXPERIMENT_ID/:

  • baseline-raw.json
  • baseline-stars.json
  • shard-raw.json
  • shard-stars.json
  • report.json

Suggested Command

python -m scripts.crawl_shard_experiment \
  --since 2026-06-06 \
  --as-of 2026-06-13 \
  --shards 3 \
  --wall-clock-budget 300 \
  --api-budget-multiplier 1.1 \
  --output-dir data/experiments/shard-435