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