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Posted to dev@nutch.apache.org by "behnam nikbakht (JIRA)" <ji...@apache.org> on 2012/06/27 10:17:42 UTC

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

behnam nikbakht created NUTCH-1410:
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             Summary: 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


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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