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Posted to dev@nutch.apache.org by "Julien Nioche (JIRA)" <ji...@apache.org> on 2011/07/06 17:29:16 UTC

[jira] [Commented] (NUTCH-1033) Backport FetcherJob should run more reduce tasks than default

    [ https://issues.apache.org/jira/browse/NUTCH-1033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060636#comment-13060636 ] 

Julien Nioche commented on NUTCH-1033:
--------------------------------------

great. +1 to commit

> Backport FetcherJob should run more reduce tasks than default
> -------------------------------------------------------------
>
>                 Key: NUTCH-1033
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1033
>             Project: Nutch
>          Issue Type: Improvement
>          Components: fetcher
>    Affects Versions: 1.3, 1.4
>            Reporter: Markus Jelsma
>             Fix For: 1.4
>
>         Attachments: NUTCH-1033-1.4-1.patch, NUTCH-1033-1.4-2.patch
>
>
> Andrzej wrote:"FetcherJob now performs fetching in the reduce phase. This means that in a typical Hadoop setup there will be many fewer reduce tasks than map tasks, and consequently the max. total throughput of Fetcher will be proportionally reduced. I propose that FetcherJob should set the number of reduce tasks to the number of map tasks. This way the fetching will be more granular."
> This issue covers the backport of NUTCH-884 to Nutch 1.4-dev.

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