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Re: Control the number of Mappers - MapReduce - [mail # user]
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...Hi, 2010/11/25 Shai Erera : You can configure on a node by node basis how many map and reduce tasks can be started by the task tracker on that node. This is done via the conf/map...
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Author: Niels Basjes,
2010-11-25, 19:55
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Re: Yahoo Open Source Real-Time MapReduce - MapReduce - [mail # user]
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...Hi, I had a quick read through the site and I have perhaps "the" question: Assume I have an existing Hadoop MapReduce application written in Java. How hard is it to make it run in real...
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Author: Niels Basjes,
2010-11-09, 10:28
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Re: Predicting how many values will I see in a call to reduce? - MapReduce - [mail # user]
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...Hi, 2010/11/7 Anthony Urso I've looked for an answer to the same question a while ago and came to the conclusion that you can't. The main limit is that the Iterator does n...
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Author: Niels Basjes,
2010-11-08, 11:32
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Re: Duplicated entries with map job reading from HBase - MapReduce - [mail # user]
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...Hi, The only thing I could thinks of right now is that perhaps you have something similar as the effect an encountered a while age and that has been described here: https://issues.apac...
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Author: Niels Basjes,
2010-11-06, 07:45
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Re: Duplicated entries with map job reading from HBase - MapReduce - [mail # user]
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...Hi, I don't know the answer (simply not enough information in your email) but I'm willing to make a guess: You are running on a system with two processing nodes? If so then try removin...
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Author: Niels Basjes,
2010-11-05, 16:23
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Understanding FileInputFormat and isSplittable. - MapReduce - [mail # user]
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...Hi, The last few weeks we built an application using Hadoop. Because we're implementing against special logfiles (line oriented, textual and gzipped) and we wanted to extract specific ...
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Author: Niels Basjes,
2010-09-07, 22:02
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