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Posted to dev@nutch.apache.org by "Lewis John McGibbney (JIRA)" <ji...@apache.org> on 2014/05/01 08:03:15 UTC

[jira] [Closed] (NUTCH-1410) impact of a map-reduce problem

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

Lewis John McGibbney closed NUTCH-1410.
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> 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: 2.3
>
>
> 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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