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From "Julien Nioche (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (NUTCH-1410) impact of a map-reduce problem
Date Fri, 18 Apr 2014 09:08:15 GMT

     [ https://issues.apache.org/jira/browse/NUTCH-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Julien Nioche resolved NUTCH-1410.
----------------------------------

    Resolution: Not a Problem

> impact of a map-reduce problem
> ------------------------------
>
>                 Key: NUTCH-1410
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1410
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher, generator
>            Reporter: behnam nikbakht
>             Fix For: 2.4
>
>
> with a simple test , found that each mapper or reducer have a local view of variables.
in Nutch, there are multiple places that share a variable between mappers or reducers , for
example in generate there is a shared variable : hostCounts . or in fetcher , the last request
time for each mapper (fetcherThread) is different from another.
> this problem cause critical problems like send multiple requests to same host that cause
to block.



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