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From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Update of "FAQ" by OwenOMalley
Date Thu, 28 Dec 2006 03:38:40 GMT
Dear Wiki user,

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

The following page has been changed by OwenOMalley:
http://wiki.apache.org/lucene-hadoop/FAQ

------------------------------------------------------------------------------
  
  [http://lucene.apache.org/hadoop/ 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.
  
+ == 2. What platform does Hadoop run on? ==
+ 
+   1. Java 1.5.x or higher, preferably from Sun
+   2. Linux and Windows are the supported operating systems, but BSD and Mac OS/X are known
to work. (Windows requires the installation of [http://www.cygwin.com/ Cygwin].
+ 
- == 2. How well does Hadoop scale? ==
+ == 3. How well does Hadoop scale? ==
  
  Hadoop has been demonstrated on clusters of up to 600 nodes.  Sort performance is [http://www.mail-archive.com/hadoop-dev%40lucene.apache.org/msg01777.html
good] and still improving.
  
- == 3. Do I have to write my application in Java? ==
+ == 4. Do I have to write my application in Java? ==
  
  No.  There are several ways to incorporate non-Java code.  HadoopStreaming permits any shell
command to be used as a map or reduce function, and Hadoop is also developing [http://svn.apache.org/viewvc/lucene/hadoop/trunk/src/c%2B%2B/
C and C++ APIs].
  
- == 4. How can I help to make Hadoop better? ==
+ == 5. How can I help to make Hadoop better? ==
  
  If you have trouble figuring how to use Hadoop, then, once you've figured something out
(perhaps with the help of the [http://lucene.apache.org/hadoop/mailing_lists.html mailing
lists]), pass that knowledge on to others by adding something to this wiki.
  
  If you find something that you wish were done better, and know how to fix it, read HowToContribute,
and contribute a patch.
  
- == 5. If I add new data-nodes to the cluster will HDFS move the blocks to the newly added
nodes in order to balance disk space utilization between the nodes? ==
+ == 6. If I add new data-nodes to the cluster will HDFS move the blocks to the newly added
nodes in order to balance disk space utilization between the nodes? ==
  
  No, HDFS will not move blocks to new nodes automatically. However, newly created files will
likely have their blocks placed on the new nodes.
  

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