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Re: doubt about reduce tasks and block writes - Hadoop - [mail # user]
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...Assuming that node A only contains replica, there is no garante that its data would never be read. First, you might lose a replica. The copy inside the node A could be used to create the mis...
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Author: Bertrand Dechoux,
2012-08-24, 22:02
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Re: Question Regarding FileAlreadyExistsException - Hadoop - [mail # user]
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...I don't think so. The client is responsible for deleting the resource before, if it might exist. Correct me if I am wrong. Higher solution (such as Cascading) usually provides a way to...
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Author: Bertrand Dechoux,
2012-08-23, 13:28
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Re: Number of Maps running more than expected - Hadoop - [mail # user]
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...Also could you tell us more about your task statuses? You might also have failed tasks... Bertrand On Thu, Aug 16, 2012 at 11:01 PM, Bertrand Dechoux wrot e: s w of em t e...
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Author: Bertrand Dechoux,
2012-08-16, 21:35
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Re: Number of Maps running more than expected - Hadoop - [mail # user]
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...Well, there is speculative executions too. http://developer.yahoo.com/hadoop/tutorial/module4.html *Speculative execution:* One problem with the Hadoop system is that by f m o s ...
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Author: Bertrand Dechoux,
2012-08-16, 21:01
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Re: help in distribution of a task with hadoop - Hadoop - [mail # user]
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...1) A standard way of doing it would be to have all your files content inside HDFS. You could then process where key would be the name of the file and value its contents. It would impro...
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Author: Bertrand Dechoux,
2012-08-13, 18:22
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Re: Mechanism of hadoop -jar - Hadoop - [mail # user]
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...1) Source code for sure. I don't know if you could find any other technical document about it. 2) Where is your file? If it is inside your jar, hadoop should not infer with the 'normal...
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Author: Bertrand Dechoux,
2012-08-11, 22:47
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Re: Reducer MapFileOutpuFormat - Hadoop - [mail # user]
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...Your use of 'index' is indeed not clear. Are you talking about Hive or HBase? I can confirm that you will have one result file per reducer. Of course, for efficiency reasons, you need ...
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Author: Bertrand Dechoux,
2012-07-27, 05:54
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Re: Hadoop Multithread MapReduce - Hadoop - [mail # user]
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...Hi, Summarizing the two previous answers : yes, multithreaded mappers are supported. However, the most common use case is to increase the number of map 'slots'. Have you consider...
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Author: Bertrand Dechoux,
2012-07-26, 07:19
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Re: Implement Triggers for HDFS - Hadoop - [mail # user]
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...HBase has coprocessors which might help you with your use case. https://blogs.apache.org/hbase/entry/coprocessor_introduction Regards Bertrand On Thu, Jul 26, 2012 at...
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Author: Bertrand Dechoux,
2012-07-26, 07:03
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