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From Apache Wiki <>
Subject [Solr Wiki] Update of "SolrCloud" by Mark Miller
Date Thu, 16 Aug 2012 15:44:26 GMT
Dear Wiki user,

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

The "SolrCloud" page has been changed by Mark Miller:

     '''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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