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https://issues.apache.org/jira/browse/NUTCH-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539617#comment-17539617
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Sebastian Nagel commented on NUTCH-2950:
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If desired I could also split the issue/PR into multiple smaller changes.
> 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
> Priority: Major
> 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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