Sebastian Nagel created NUTCH-2690:
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Summary: Configurable and fast URL filter
Key: NUTCH-2690
URL: https://issues.apache.org/jira/browse/NUTCH-2690
Project: Nutch
Issue Type: Improvement
Components: plugin
Reporter: Sebastian Nagel
Fix For: 1.16
This improvement introduces a new URL filter plugin "urlfilter-fast" (naming
debatable) which is in use at Common Crawl [since
2013|https://github.com/commoncrawl/nutch/commit/968e0d8f292bed46e4e3eb276cb475f4403ea9bd]
to apply a long list of filters.
# an exact (suffix) match against the host name is done to retrieve
host/domain-specific regex rules
# applies a regular expression against the path (and query) component of the URL
What makes it faster than urlfilter-regex for common cases:
- regexes are selected by host name or it's domain suffix, so there are usually
fewer rules to be checked. That's similar to NUTCH-1838 but any domain suffix
can be matched including {{subdomain.domain.com}}, {{com}} or {{.}} for global
rules. The selection by host name suffix is considerably fast.
- regexes are applied only to the path component (optionally including the
query) and not the entire URL.
Matching against a shorter string can make a huge difference for more complex
regular expressions.
- the rule to deny everything from a host or domain gets special treatment to
be fast
More details about the rule format are found in the plugin's
[README|https://github.com/commoncrawl/nutch/blob/cc-fast-url-filter/src/plugin/urlfilter-fast/README.md].
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