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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (NUTCH-2455) Speed up the merging of HostDb entries for variable fetch delay
Date Thu, 18 Jan 2018 17:51:00 GMT


ASF GitHub Bot commented on NUTCH-2455:

lewismc commented on issue #254: fix for NUTCH-2455 more efficient usage of hostdb in generate
   @okedoki thank you very much, this is a big patch and we need to test it out.

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> Speed up the merging of HostDb entries for variable fetch delay
> ---------------------------------------------------------------
>                 Key: NUTCH-2455
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>          Components: generator
>    Affects Versions: 1.13
>            Reporter: Markus Jelsma
>            Priority: Major
>         Attachments: NUTCH-2455.patch
> Citing Sebastian at NUTCH-2420:
> ??The correct solution would be to use <host,score> pairs as keys in the Selector
job, with a partitioner and secondary sorting so that all keys with same host end up in the
same call of the reducer. If values can also hold a HostDb entry and the sort comparator guarantees
that the HostDb entry (entries if partitioned by domain or IP) comes in front of all CrawlDb
entries. But that would be a substantial improvement...??

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