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[expand - 1 more] - Re: - MapReduce - [mail # user]
...Look for "Hadoop the Definitive Guide" or "Hadoop in Practice" in your bookstore. Or search at google for map reduce blogs .... There is a lot of good stuff ... just take it! Good luck and h...
   Author: Mirko Kämpf, 2013-12-13, 13:43
Re: XML parsing in Hadoop - MapReduce - [mail # user]
...Chhaya,  did you run the same code in stand alone mode without MapReduce framework? How long takes the code in you map() function standalone? Compare those two different times (t_0 MR m...
   Author: Mirko Kämpf, 2013-11-28, 07:23
Re: how to schedule the hadoop commands in cron job or any orther way? - MapReduce - [mail # user]
...Hi,  it is easy to create a shell script which contains the hadoop jar ... command with all it's parameters. And this command can be used in your cron job. But are you sure, you are wor...
   Author: Mirko Kämpf, 2013-11-07, 12:18
Re: Volunteer - MapReduce - [mail # user]
...What is the field you want to working in, core hadoop development, scripting and testing, documentation, tool development, app development, benchmarking?  What is your level of experien...
   Author: Mirko Kämpf, 2013-11-07, 03:16
Re: best solution for data ingestion - MapReduce - [mail # user]
...Have a look on Sqoop for data from RDBMS or Flume, if data flows and multiple sources have to be used. Best wishes Mirko   2013/11/1 Siddharth Tiwari  ...
   Author: Mirko Kämpf, 2013-11-01, 17:57
Re: Issues in emitting 2D double array to Reducer. - MapReduce - [mail # user]
...Hi,  you should create a custom data type, which contains two of the DoubleArrayWritable instances. This custom data type idea is also explained here: http://my.safaribooksonline.com/bo...
   Author: Mirko Kämpf, 2013-10-28, 10:30
Re: issue about hadoop hardware choose - MapReduce - [mail # user]
...Hello Ch Huang,   Do you know this book? "Hadoop Operations" http://shop.oreilly.com/product/0636920025085.do  I think, it answers most of the questions in detail.  For a prod...
   Author: Mirko Kämpf, 2013-08-08, 12:23
Re: What's the best disk configuration for hadoop? SSD's Raid levels, etc? - MapReduce - [mail # user]
...Hi David,   your first point :  the role of thumb is : "one disk per CPU (or per 1.5 to 2 CPU)" in your case more parrallel IO could be possible with more disks, but as you wrote, ...
   Author: Mirko Kämpf, 2013-05-11, 08:16
Re: Saving data in db instead of hdfs - MapReduce - [mail # user]
...Hi,  just use Sqoop to push the data from HDFS to a database via JDBC.  Intro to Sqoop: http://blog.cloudera.com/blog/2009/06/introducing-sqoop/  Or even use Hive-JDBC to conn...
   Author: Mirko Kämpf, 2013-05-03, 03:34
Re: Multiple mappers, different parameter values - MapReduce - [mail # user]
...Hi,  I would add an id to the parameter name: "num.iterations.ID=something" If your mapper knows what ID it has it can just pick up this value from the context. But the question is: How...
   Author: Mirko Kämpf, 2013-04-02, 17:04
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