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The "SolrCloud" page has been changed by Mark Miller:
http://wiki.apache.org/solr/SolrCloud?action=diff&rev1=62&rev2=63

     '''A:''' Try raising the ZooKeeper session timeout by editing solr.xml - 
see the zkClientTimeout attribute. The minimum session timeout is 2 times your 
ZooKeeper defined tickTime. The maximum is 20 times the tickTime. The default 
tickTime is 2 seconds.
   * '''Q:''' How do I use SolrCloud, but distribute updates myself?
     '''A:''' Add the following UpdateProcessorFactory somewhere in your update 
chain: '''NoOpDistributingUpdateProcessorFactory'''
+  * '''Q:''' What is the difference between a Collection and a SolrCore?
+    '''A:''' In classic single node Solr, a SolrCore is basically equivalent 
to a Collection. It presents one logical index. In SolrCloud, the SolrCore's on 
multiple nodes form a Collection. This is still just one logical index, but 
multiple SolrCores host different 'shards' of the full collection. So a 
SolrCore encapsulates a single physical index on an instance. A Collection is a 
combination of all of the SolrCores that together provide a logical index that 
is distributed across many nodes.
  

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