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Posted to dev@nutch.apache.org by "Sebastian Nagel (Jira)" <ji...@apache.org> on 2022/05/19 15:00:00 UTC

[jira] [Created] (NUTCH-2950) UpdateHostDb: performance improvements

Sebastian Nagel created NUTCH-2950:
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             Summary: UpdateHostDb: performance improvements
                 Key: NUTCH-2950
                 URL: https://issues.apache.org/jira/browse/NUTCH-2950
             Project: Nutch
          Issue Type: Improvement
          Components: hostdb
    Affects Versions: 1.18
            Reporter: Sebastian Nagel
            Assignee: Sebastian Nagel
             Fix For: 1.19


This issue addresses a couple of performance improvements when creating the HostDb:
- avoid needless conversions between hostname and URL
- improvements of HostDb serialization (write and read)
- parametrize logging and log less on level INFO
- do not create DNS resolver threads if DNS look-ups are not requested by command-line options

A patch/PR is ready. Depending on the chosen command-line options, a 10-20% speed-up should be visible if DNS look-ups, normalization and filtering are off.



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