mirror of https://github.com/apache/lucene.git
adding an upgrade note about the lucene format changes
git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@641573 13f79535-47bb-0310-9956-ffa450edef68
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@ -26,6 +26,12 @@ $Id$
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Upgrading from Solr 1.2
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-----------------------
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Solr 1.3 includes a newer version of Lucene (2.3.1). The new index
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format is not readable by older versions of Lucene. Existing indexes
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will be automatically converted to the new format after the first
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<update> command. Be sure to backup your index before upgrading in
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case you need to downgrade.
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Solr now recognizes HTTP Request headers related to HTTP Caching (see
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RFC 2616 sec13) and will by default respond with "304 Not Modified"
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when appropriate. This should only affect users who access Solr via
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