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From "Markus Jelsma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NUTCH-2455) Speed up the merging of HostDb entries for variable fetch delay
Date Mon, 06 Nov 2017 16:11:00 GMT
Markus Jelsma created NUTCH-2455:
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             Summary: Speed up the merging of HostDb entries for variable fetch delay
                 Key: NUTCH-2455
                 URL: https://issues.apache.org/jira/browse/NUTCH-2455
             Project: Nutch
          Issue Type: Improvement
          Components: generator
    Affects Versions: 1.13
            Reporter: Markus Jelsma


??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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