[Cassandra Wiki] Update of "CassandraLimitations" by JonathanEllis

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The "CassandraLimitations" page has been changed by JonathanEllis:
http://wiki.apache.org/cassandra/CassandraLimitations?action=diff&rev1=28&rev2=29

  
  == Stuff that isn't likely to change ==
   * All data for a single row must fit (on disk) on a single machine in the cluster. Because row keys alone are used to determine the nodes responsible for replicating their data, the amount of data associated with a single key has this upper bound.
-  * A single column value may not be larger than 2GB.
+  * A single column value may not be larger than 2GB.  (However, large values are read into memory when requested, so in practice "small number of MB" is more appropriate.)
   * The maximum of column per row is 2 billion.
   * The key (and column names) must be under 64K bytes.