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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "FAQ" by SomeOtherAccount
Date Tue, 14 Jun 2011 23:49:01 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "FAQ" page has been changed by SomeOtherAccount:
http://wiki.apache.org/hadoop/FAQ?action=diff&rev1=102&rev2=103

Comment:
Remove the gridgain question and clarify that the platforms question also covers java.

  == What is Hadoop? ==
  [[http://hadoop.apache.org/core/|Hadoop]] is a distributed computing platform written in
Java.  It incorporates features similar to those of the [[http://en.wikipedia.org/wiki/Google_File_System|Google
File System]] and of [[http://en.wikipedia.org/wiki/MapReduce|MapReduce]].  For some details,
see HadoopMapReduce.
  
- == What platform does Hadoop run on? ==
+ == What platform and Java versions does Hadoop run on? ==
   1. Java 1.6.x or higher, preferably from Sun -see HadoopJavaVersions
   1. Linux and Windows are the supported operating systems, but BSD, Mac OS/X, and OpenSolaris
are known to work. (Windows requires the installation of [[http://www.cygwin.com/|Cygwin]]).
  
@@ -35, +35 @@

  == What kind of hardware scales best for Hadoop? ==
  The short answer is dual processor/dual core machines with 4-8GB of RAM using ECC memory.
Machines should be moderately high-end commodity machines to be most cost-effective and typically
cost 1/2 - 2/3 the cost of normal production application servers but are not desktop-class
machines. This cost tends to be $2-5K. For a more detailed discussion, see MachineScaling
page.
  
- == How does GridGain compare to Hadoop? ==
- !GridGain does not support data intensive jobs. For more details, see HadoopVsGridGain.
- 
  == I have a new node I want to add to a running Hadoop cluster; how do I start services
on just one node? ==
  This also applies to the case where a machine has crashed and rebooted, etc, and you need
to get it to rejoin the cluster. You do not need to shutdown and/or restart the entire cluster
in this case.
  

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