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From "Sebastian Nagel (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (NUTCH-2690) Configurable and fast URL filter
Date Mon, 06 May 2019 15:32:00 GMT

     [ https://issues.apache.org/jira/browse/NUTCH-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on NUTCH-2690 started by Sebastian Nagel.
----------------------------------------------
> 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
>            Assignee: Sebastian Nagel
>            Priority: Minor
>             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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