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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