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The "SolrCloud" page has been changed by ChrisBeer: http://wiki.apache.org/solr/SolrCloud?action=diff&rev1=93&rev2=94 Comment: Adding important 4.0 -> 4.1 solrcloud change that was previously only documented on a lucidworks site. The Grouping feature only works if groups are in the same shard. Proper support will require custom hashing and there is already a JIRA issue working towards this. + If upgrading an existing Solr instance instance running with SolrCloud from Solr 4.0 to 4.1, be aware that the way the name_node parameter is defined has changed. This may cause a situation where the name_node uses the IP address of the machine instead of the server name, and thus SolrCloud is not aware of the existing node. If this happens, you can manually edit the host parameter in solr.xml to refer to the server name, or set the host in your system environment variables (since by default solr.xml is configured to inherit the host name from the environment variables). See also the section Core Admin and Configuring solr.xml for more information about the host parameter. + == Glossary == ||'''Collection''': ||A single search index. || ||'''Shard''': ||A logical section of a single collection (also called Slice). Sometimes people will talk about "Shard" in a physical sense (a manifestation of a logical shard) ||
