Glossary · Crawling and indexing

Crawl queue

The ordered subset of URLs scheduled for fetching. Priority, host limits, failures, and budgets can indefinitely delay an item in the queue.

Crawling and indexing

How a crawler discovers, schedules, fetches and selects pages, and why a fetched page is not an indexed one.

Crawler identity · Product token · Identification string · Crawl frontier · Crawl scheduler · Seed URL · URL discovery · Link extraction · Recrawl interval · Crawl frequency · Host politeness · Crawl rate · Crawl-delay · Robots group merging · Longest-match rule · Wildcard rule · End-anchor rule · Robots cache · Robots parse error · Robots redirect · Robots unavailable · Sitemap · Sitemap URL set · Sitemap lastmod · Sitemap hreflang · Image sitemap · Video sitemap · News sitemap · Canonical cluster · Duplicate cluster · Index selection · Crawl demand · Rendering queue · Rendered HTML · Indexing pipeline · Index freshness · Index lag · Deindexing · Removal request · URL inspection · Crawl anomaly · Bot spoofing · Shared IP range · Web Bot Auth

← Crawl frontier  ·  Crawl scheduler →

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