Flowcharts & Processes

Web Crawler URL Deduplication Flow

Flowcharts & Algorithms diagram · made in Skemio

Flowchart showing URL deduplication: normalization, Bloom filter checking, exact hash validation, robots.txt check, and crawl queue insertion.
Flowchart showing URL deduplication: normalization, Bloom filter checking, exact hash validation, robots.txt check, and crawl queue insertion.
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What it shows

  • Canonicalization strips tracking params and standardizes scheme and case.
  • Probabilistic Bloom filters filter 99% of unseen URLs in memory.
  • Secondary disk-backed hash tables guarantee zero false-positive skips.

The takeaway

Tiering in-memory Bloom filters with persistent hash verification stops crawler duplicates at scale.

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