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==== Hadoop Summary ====

Our production Hadoop Cluster is based on [[http://www.cloudera.com/content/cloudera/en/home.html|Cloudera]]'s CD3U6 repository.  Here are some details :

  * namenode (that is login node): whitetail.wesleyan.edu
    * whitetail also runs the Hadoop Scheduler and Health Monitor
      *  [[http://whitetail.wesleyan.edu:50070|Health Status]]
      *  [[http://whitetail.wesleyan.edu:50030|Job Tracker]]
    * ssh to it directly or from any of our other tails
  * resources: access to 600 GB of memory and 1.75 TB of Hadoop's Distributed File System (HDFS)
    * could be doubled in near future if needed

  * HDFS is not backed up!
    * You must request a  writable work area /userdata/username
    * Be sure to down load your results to /home/username (that is the regular filesystem)

  * Data to be shared (dictionaries, anagrams, etc) can be posted in /shareddata
    * request such items to be posted there

  * Basic tools (request other tools to be installed)
    * shell scripting
    * python
    * perl (Hadoop::Streaming)
    * java (both Oracle in /usr/java and openJDK)
    * R+RHadoop (rmr2, rhdfs, rhbase)
    * Hbase (noSQL database)
      * [[http://whitetail.wesleyan.edu:60010|Master & Zookeepers]]
      * [[http://whitetail.wesleyan.edu:9095|Thrift server]]
    * MySQL 
      * request a database to be set up for you (limited space)

  * Note: the permissions are bit weird in HDFS but I think it is sorted out.
    * If this turns into a problem we'll let everybody run as user hdfs ...
  * Note: some http links will not work because they point to the private network
    * If you wish to view them launch firefox from whitetail ...

Other useful pages

  * [[cluster:114|Build Hadoop Cluster]]
  * [[cluster:115|Use Hadoop Cluster]]

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