I am a newbie to Hadoop. I have managed to develop a simple Map/Reduce application that works fine in \'pseudo distributed mode\'.I want to test that in \'fully distributed mode\'. I have few question
In Hadoop \'grep\' example (tha开发者_开发问答t comes with the Hadoop package) what is the group parameter.Can you give me an example for that.Disclaimer: I haven\'t run this example and am pulling an
Not sure if anyone has run into this issue. I am trying to use oozie for running a simple MapReduce job that searches for a string value in HDFS location and if it finds it it outputs it.When I submit
A blog post - http://petewarden.typepad.com/searchbrowser/2011/05/using-hadoop-with-external-api-calls.html 开发者_如何学Python- suggests calling external systems (querying the twitter API, or crawlin
For a special re开发者_StackOverflow社区ason, I want to setup a hadoop node to be a tasktracker but not a datanode. It seems like there is a way to do it but I have not been able too. Could someone gi
But when I run the hadoop included wordcount example (dfs version), I see the load getting distributed to all the slaves.
I\'m going completely crazy: Installed Hadoop/Hbase, all is running; /opt/jdk1.6.0_24/bin/jps 23261 ThriftServer
I have a simple use case. In my input file I just need to calculate the percentage distribution of total number of words. For example word1 is present 10 times, word2 is present 5 times etc and the to
I\'m consider to use HDFS as horizontal scaling file storage system for our client video hosting service. My main concern that HDFS wasn\'t developed for this needs this is more \"an open source syste
In my application the reducer saves all the part files in HDFS but I want only the reducer wi开发者_开发技巧ll write the part files whose sizes are not 0bytes.Please let me know how to define it.It is
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