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How can I sort a file with pairs <Key Value> in reverse order? - MapReduce - [mail # user]
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...I created a MapReduce job example that that uses the sort mechanism of hadoop to sort a file by the key in ascending order. This is an example of the data: 7 vim 2 ...
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Author: Pedro Sá da Costa,
2013-06-11, 10:10
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delete the job history saved in the Job History Server in Yarn - MapReduce - [mail # user]
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...I want to delete the job history saved in the Job History Server in Yarn. How i do that? Best regards,...
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Author: Pedro Sá da Costa,
2013-06-11, 09:34
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split big files into small ones to later copy - MapReduce - [mail # user]
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...I have one 500GB plain-text file in HDFS, and I want to copy locally, to zip it and put it on another machine in a local disk. The problem is that I don't have enough space in the local disk...
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Author: Pedro Sá da Costa,
2013-06-07, 06:03
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Re: Count lines example - MapReduce - [mail # user]
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...I made a mistake in my example. Given 2 files with the same content: file 1 | file 2 A 3 | A 3 B 4 | B 4 gives the output A &nbs...
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Author: Pedro Sá da Costa,
2013-06-05, 19:13
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Count lines example - MapReduce - [mail # user]
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...I am trying to create a mapreduce example that add values of same keys. E.g. the input A 1 A 2 B 4 get the output A 3 B4 The problem is that I cannot ...
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Author: Pedro Sá da Costa,
2013-06-05, 19:08
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Print logs in MapReduce example - MapReduce - [mail # user]
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...Hi, I created my mapreduce example for hadoop 2.0.4, and how I print the logs in the console output? The System.out.println(), Logger.getRootLogger(), and Logger.getLogge(MyClass.clas...
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Author: Pedro Sá da Costa,
2013-06-03, 11:21
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set HTTPFS in Hadoop 2.0.4 - MapReduce - [mail # user]
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...Hi, I set the HTTFS of Hadoop 2.0.4 to run in the port 3888. Now I want to access the filesystem but I can't do it. Here's the URL that I am using, and the config files. How can I fix ...
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Author: Pedro Sá da Costa,
2013-06-02, 12:56
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how launch mapred in hadoop 2.0.4? - MapReduce - [mail # user]
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...In hadoop mapreduce there is the need to launch mapred (mapred start), or launching yarn ( $sbin/yarn-daemon.sh start resourcemanager ; sbin/yarn-daemon.sh start nodemanager) is the same thi...
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Author: Pedro Sá da Costa,
2013-06-01, 17:18
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distcp in Hadoop 2.0.4 over http? - MapReduce - [mail # user]
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...I want to copy HDFS filese over HTTP using distcp, but I can't. It is a problem of configuration that I can't find it. How can I do distcp in Hadoop 2.0.4 over HTTP? First I set up had...
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Author: Pedro Sá da Costa,
2013-06-01, 16:10
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Queues in hadoop 2.0.4 - MapReduce - [mail # user]
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...I am using hadoop 2.0.4 1 - Which component manage queues? Is it the jobtracker? 2 - If so, it is possible to define several queues (set mapred.job.queue.name=$QUEUE_NAME;)? &nbs...
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Author: Pedro Sá da Costa,
2013-05-30, 12:25
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