[Cassandra Wiki] Update of "FAQ" by EricEvans

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The following page has been changed by EricEvans:
http://wiki.apache.org/cassandra/FAQ

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link question to toc

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   * [#cant_listen_on_ip_any Why can't I make Cassandra listen on 0.0.0.0 (all my addresses)?]
   * [#slows_down_after_lotso_inserts Why does Cassandra slow down after doing a lot of inserts?]
+  * [#existing_data_when_adding_new_nodes What happens to existing data in my cluster when I add new nodes?]
  
  [[Anchor(cant_listen_on_ip_any)]]
  == Why can't I make Cassandra listen on 0.0.0.0 (all my addresses)? ==
@@ -21, +22 @@

  
  You can increase the amount of memory the JVM uses, or decrease the insert threshold before Cassandra flushes its memtables.  See MemtableThresholds for details.
  
+ [[Anchor(existing_data_when_adding_new_nodes)]]
  == What happens to existing data in my cluster when I add new nodes? ==
  
  Start the new nodes with the -b [bootstrap] option and it will contact other nodes in the cluster to move the right data to it.