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https://issues.apache.org/jira/browse/NUTCH-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273354#comment-13273354
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Markus Jelsma commented on NUTCH-1366:
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Ah i see! This would mean the WebGraph can also update inlinks to the WebPage
object.
Nice +1
> speed up indexing by eliminating the indexreducer
> -------------------------------------------------
>
> Key: NUTCH-1366
> URL: https://issues.apache.org/jira/browse/NUTCH-1366
> Project: Nutch
> Issue Type: Improvement
> Components: indexer
> Reporter: Ferdy Galema
> Fix For: nutchgora
>
> Attachments: NUTCH-1366.patch
>
>
> Currently the indexer in Nutchgora consists of both mappers and reduces. But
> the reduce code does not actually iterate over any (grouped/sorted) values.
> It simply indexes individual key/value (String/Webpage) pairs. Therefore by
> moving this indexing code to the mapper we can eliminate the reduce step
> therefore making the indexing job much faster. (No more unnecessary spilling
> to disk/network and no cpu wasted to sorting).
> Note this is not (directly) applicable to trunk because trunk uses a quite
> different approach. Different types of input are combined to a single value
> in the reducer. Although I think it is possible to implement a similar
> optimization I am not sure how to do this. So if anyone wants this for trunk
> too feel free to implement a similar patch.
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