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https://issues.apache.org/jira/browse/NUTCH-420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463214
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Dogacan Güney commented on NUTCH-420:
-------------------------------------
Attaching the patch with a testcase (I hope that I got it right, but I am new
to junit).
> DeleteDuplicates.HashPartitioner depends on the order of IndexDocs
> ------------------------------------------------------------------
>
> Key: NUTCH-420
> URL: https://issues.apache.org/jira/browse/NUTCH-420
> Project: Nutch
> Issue Type: Bug
> Components: indexer
> Affects Versions: 0.9.0
> Reporter: Dogacan Güney
> Priority: Minor
> Attachments: dedup-v2.patch, dedup-v3.patch, dedup.patch, index.tar.gz
>
>
> DeleteDuplicates.HashPartitioner.reduce():
> // byScore case
> if (value.score > highest.score) {
> highest.keep = false;
> LOG.debug("-discard " + highest + ", keep " + value);
> output.collect(highest.url, highest); // delete highest
> highest = value;
> }
> // !byScore is also similar
> So assume two docs with same hash are in values.If the first has higher score
> than the second than second doc will be deleted. But if the first has lower
> score than the second then none will be deleted. AFAICS, there should be an
> else condition to delete value and keep highest as it is.
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