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From Sitaraman Vilayannur <vrsitaramanietfli...@gmail.com>
Subject Re: Request for a pointer to a MapReduce Program tutorial
Date Sun, 29 Dec 2013 00:46:08 GMT
Thanks Diego, will use the copyToLocal.
Sitaraman

On 12/29/13, Diego Gutierrez <diego.gutierrez@ucsp.edu.pe> wrote:
> Hi,
>
> For the first question, the name of the file containing the response of MR
> process is like that:  part-r-00000. This file is inside the output
> directory.
>
> The second question, to locate the file in your linux file system you have
> to go to your datanode directory. This directory path is in your
> hdfs-site.xml file in {HADOOP_INSTALLATION}/etc/hadoop. In my case the full
> path of the MR response file is:
> /home/user/hadoop/data2.2/hdfs/datanode/current/BP-1422783414-127.0.1.1-1387647958374/current/finalized.
>
> where my datanode directory is: /home/user/hadoop/data2.2/hdfs/namenode.
>
> In the /finalized directory, there are files named like that:
> blk_1073741836. In one of those files is the MR response file. This aproach
> is not good if you want to open the response with vi for example, instead
> you can copy the response file into your linux file system using
> *copyToLocal* command(
> https://hadoop.apache.org/docs/current2/hadoop-project-dist/hadoop-common/FileSystemShell.html#copyToLocal).
> The syntax could be like that: bin/hadoop dfs -copyToLocal
> /output/part-r-00000 /home/user/
>
> Hope this help
>
>
> 2013/12/28 Sitaraman Vilayannur <vrsitaramanietflists@gmail.com>
>
>> Hi all,
>>   Thanks much for the pointers. I ran word count it appears,
>> successfully. Currently in inspected the output like so,
>> /usr/local/Software/hadoop-2.2.0/bin/hadoop fs -cat
>> /user/sitaraman/output/*
>> Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library
>> /usr/local/Software/hadoop-2.2.0/lib/native/libhadoop.so.1.0.0 which
>> might have disabled stack guard. The VM will try to fix the stack
>> guard now.
>> It's highly recommended that you fix the library with 'execstack -c
>> <libfile>', or link it with '-z noexecstack'.
>> 13/12/28 15:13:06 WARN util.NativeCodeLoader: Unable to load
>> native-hadoop library for your platform... using builtin-java classes
>> where applicable
>> as      2
>> do      1
>> do:     1
>> i       2
>> not     1
>> say     1
>>
>> What is the name of the file in the output directory?  Can i read it
>> say using emacs or vi where will the directory /user/sitaraman/output
>> be in the linux fs, that is how to locate where it is....
>> Thanks again for all the help.
>> Sitaraman
>>
>> On 12/28/13, Hardik Pandya <smarty.juice@gmail.com> wrote:
>> > I recently blogged about it - hope it helps
>> >
>> >
>> http://letsdobigdata.wordpress.com/2013/12/07/running-hadoop-mapreduce-application-from-eclipse-kepler/
>> >
>> > Regards,
>> > Hardik
>> >
>> > On Fri, Dec 27, 2013 at 6:53 AM, Sitaraman Vilayannur <
>> > vrsitaramanietflists@gmail.com> wrote:
>> >
>> >> Hi,
>> >>  Would much appreciate a pointer to a mapreduce tutorial which
>> >> explains
>> >> how i can run a simulated cluster of mapreduce nodes on a single PC
>> >> and
>> >> write a Java program with the MapReduce Paradigm.
>> >>  Thanks very much.
>> >> Sitaraman
>> >>
>> >
>>
>

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