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Posted to common-commits@hadoop.apache.org by Apache Wiki <wi...@apache.org> on 2007/09/10 19:06:39 UTC

[Lucene-hadoop Wiki] Update of "FAQ" by OwenOMalley

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

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  that is the most recent name space modifications may be missing there.
  You will also need to restart the whole cluster in this case.
  
+ 
+ === 8. What is the Distributed Cache used for?
+ 
+ The distributed cache is used to distribute large read-only files that are needed by map/reduce jobs to the cluster. The framework will copy the necessary files from a url (either hdfs: or http:) on to the slave node before any tasks for the job are executed on that node. The files are only copied once per job and so should not be modified by the application.
+