[Cassandra Wiki] Update of "FAQ" by ChrisBurroughs

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The "FAQ" page has been changed by ChrisBurroughs.
http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=111&rev2=112

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   * [[#mmap|Why does top report that Cassandra is using a lot more memory than the Java heap max?]]
   * [[#jna|I'm getting java.io.IOException: Cannot run program "ln" when trying to snapshot or update a keyspace]]
   * [[#replicaplacement|How does Cassandra decide which nodes have what data?]]
+  * [[#cachehitrateunits| I have a row or key cache hit rate of 0.XX123456789.  Is that XX% or 0.XX% ?]]
+ 
  <<Anchor(cant_listen_on_ip_any)>>
  
  == Why can't I make Cassandra listen on 0.0.0.0 (all my addresses)? ==
@@ -417, +419 @@

  
  It is important to understand that Cassandra ''does not'' alter the replica set for a given row key based on changing characteristics like current load, which nodes are up or down, or which node your client happens to talk to.
  
+ <<Anchor(cachehitrateunits)>>
+ 
+ == I have a row or key cache hit rate of 0.XX123456789 reported by JMX.  Is that XX% or 0.XX% ? ==
+ 
+ XX%
+