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https://issues.apache.org/jira/browse/NUTCH-2455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16339312#comment-16339312
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ASF GitHub Bot commented on NUTCH-2455:
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okedoki commented on issue #254: fix for NUTCH-2455 more efficient usage of
hostdb in generate
URL: https://github.com/apache/nutch/pull/254#issuecomment-360488123
There was a silly bug that didnt copy hostdb correctly in reducer because of
copy-by-reference.
My bad, fixed with clone.
hostDomainCounts.put(key.second.toString(), new MutablePair<HostDatum,
int[]>((HostDatum) hostDatum.clone(), new int []{1,0})); at line 484
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> 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
> 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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