[ 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]. -- This message was sent by Atlassian JIRA (v7.6.3#76005)