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From Apache Wiki <>
Subject [Solr Wiki] Update of "NewSolrCloudDesign" by YonikSeeley
Date Thu, 18 Aug 2011 16:39:28 GMT
Dear Wiki user,

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The "NewSolrCloudDesign" page has been changed by YonikSeeley:

alternative to cluster lock

   * Multiple schema support ?  Should we just remove it from ver 1.0 for simplicity?
   * solr.xml .  Is there a need at all for this in the cloud mode?
+ == Alternative to a Cluster Lock ==
+ It may be simpler to have a coordinator node (we avoid the term master since that is associated
with traditional index replication) that is established via leader election.
+ Following a pattern of treating the zookeeper state as the "truth" and having nodes react
to changes in that state allow for more future flexibility (such as allowing an external management
tool directly change the zookeeper state to control the cluster).  Having a coordinator (as
opposed to grabbing a lock every time) can be more scalable too.  A hybrid model where a cluster
lock is used only in certain circumstances can also make sense.

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