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Posted to dev@nutch.apache.org by "Markus Jelsma (JIRA)" <ji...@apache.org> on 2017/11/06 16:11:00 UTC
[jira] [Created] (NUTCH-2455) Speed up the merging of HostDb
entries for variable fetch delay
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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