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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "HadoopIsNot" by SteveLoughran
Date Wed, 25 Nov 2009 17:09:53 GMT
Dear Wiki user,

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

The "HadoopIsNot" page has been changed by SteveLoughran.
The comment on this change is: remove xref from a title.
http://wiki.apache.org/hadoop/HadoopIsNot?action=diff&rev1=5&rev2=6

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  Because of these limitations, if you want a secure filesystem that is always available,
HDFS is not yet there. You can run Hadoop MapReduce over other filesystems, however.
  
- == [HDFS] is not a Posix filesystem ==
+ == HDFS is not a Posix filesystem ==
  
  The Posix filesystem model has files that can appended too, seek() calls made, files locked.
Hadoop is only just adding (in July 2009) append() operations, and seek() operations throw
away a lot of performance. You cannot seamlessly map code that assumes that all filesystems
are Posix-compatible to HDFS.
  

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