Sebastian Nagel created NUTCH-2689:
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Summary: Speed up urlfilter-regex and urlfilter-automaton
Key: NUTCH-2689
URL: https://issues.apache.org/jira/browse/NUTCH-2689
Project: Nutch
Issue Type: Improvement
Components: plugin
Affects Versions: 1.15
Reporter: Sebastian Nagel
Fix For: 1.16
The unit tests of urlfilter-regex and urlfilter-automaton include a benchmark.
After playing and benchmarking modifications the following changes seem to
significantly improve the performance:
- do not extract host and domain name from the URL if not needed (no
host/domain-specific rules used, cf. NUTCH-1838)
- use non-capturing groups if possible
- use {{(?i)}} to make the patterns case insensitive and remove uppercase
variants
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