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https://issues.apache.org/jira/browse/NUTCH-2455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430526#comment-16430526
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Sebastian Nagel commented on NUTCH-2455:
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Hi [[email protected]],
yes, please, resolve the conflicts and remove or address the TODOs in the code.
Thanks!
??we ran it several times for number of hosts in between 100 000 and 2 000 000
, it worked quite well.??
It will probably not scale up to 10-100 millions of hosts. But that's ok for
now, as Generator is limited regarding the number of hosts because also the
number of URLs per host is also kept in a HashMap.
> 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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