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  1. Nutch
  2. NUTCH-1410

impact of a map-reduce problem

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Not A Problem
    • Affects Version/s: None
    • Fix Version/s: 2.3
    • Component/s: fetcher, generator
    • Labels:
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      Description

      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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            • Assignee:
              Unassigned
              Reporter:
              behnam.nikbakht behnam nikbakht
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                Updated:
                Resolved: