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https://issues.apache.org/jira/browse/NUTCH-530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emmanuel Joke updated NUTCH-530:
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Attachment: NUTCH-530.patch
Patch provided.
It reduced the process time by 20%.
Output from the task:
Map output records=98317
Map input bytes=10907058
Map output bytes=10021579
Combine input records=98317
Combine output records=42390
Reduce input groups=28601
Reduce input records=43005
Reduce output records=28601
I can see a real improvement.
> Add a combiner to improve performance on updatedb
> -------------------------------------------------
>
> Key: NUTCH-530
> URL: https://issues.apache.org/jira/browse/NUTCH-530
> Project: Nutch
> Issue Type: Improvement
> Environment: java 1.6
> Reporter: Emmanuel Joke
> Assignee: Emmanuel Joke
> Fix For: 1.0.0
>
> Attachments: NUTCH-530.patch
>
>
> We have a lot of similar links with status "linked" generated at the ouput of
> the map task when we try to update the crawldb based on the segment fetched.
> We can use a combiner to improve the performance.
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