solr的索引更新

背景： solr作为搜索工具，索引采用传统的lucene构建，当更新索引文件的时候，搜索并不会出现更新

solr确实做了精细的缓存机制，缓存跟一个特定的searcher绑定，与普通的缓存相比，solr的缓存并不会在一段时间之后失效，除非searcher发生改变

当你将solr集成到你的应用，而非采用solr服务器方式的时候，此时会带来麻烦，你不得不自己编写代码解决

通过分析solr自带的readercycle脚本和SolrUpdateServlet,你就会容易的找到答案

代码如下：

legacyUpdateHandler = new XmlUpdateRequestHandler();
legacyUpdateHandler.init( null );
BufferedReaderrequestReader = new BufferedReader( new StringReader( " <commit/> " ));
legacyUpdateHandler.update(requestReader);

当你跟新了索引文件，然后再调用此段代码，你会发现类似结果

2008 - 4 - 23 1 : 28 : 12 org.apache.solr.update.DirectUpdateHandler2commit
信息:startcommit(optimize = false , waitFlush = false , waitSearcher = true)
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcher<init>
信息:OpeningSearcher@1474fcmain
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.update.DirectUpdateHandler2commit
信息:end_commit_flush
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingSearcher@1474fcmainfromSearcher@c550main
filterCache{lookups = 0 , hits = 0 , hitratio = 0.00 , inserts = 1 , evictions = 0 , size = 1 , cumulative_lookups = 0 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 1 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingresultforSearcher@1474fcmain
filterCache{lookups = 0 , hits = 0 , hitratio = 0.00 , inserts = 1 , evictions = 0 , size = 1 , cumulative_lookups = 0 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 1 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingSearcher@1474fcmainfromSearcher@c550main
queryResultCache{lookups = 1 , hits = 0 , hitratio = 0.00 , inserts = 1 , evictions = 0 , size = 1 , cumulative_lookups = 1 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 1 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingresultforSearcher@1474fcmain
queryResultCache{lookups = 0 , hits = 0 , hitratio = 0.00 , inserts = 1 , evictions = 0 , size = 1 , cumulative_lookups = 1 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 1 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingSearcher@1474fcmainfromSearcher@c550main
documentCache{lookups = 0 , hits = 0 , hitratio = 0.00 , inserts = 0 , evictions = 0 , size = 0 , cumulative_lookups = 0 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 0 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.search.SolrIndexSearcherwarm
信息:autowarmingresultforSearcher@1474fcmain
documentCache{lookups = 0 , hits = 0 , hitratio = 0.00 , inserts = 0 , evictions = 0 , size = 0 , cumulative_lookups = 0 , cumulative_hits = 0 , cumulative_hitratio = 0.00 , cumulative_inserts = 0 , cumulative_evictions = 0 }
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.core.SolrCoreregisterSearcher
信息:RegisterednewsearcherSearcher@1474fcmain
2008 - 4 - 23 1 : 28 : 12 org.apache.solr.handler.XmlUpdateRequestHandlerupdate
信息:commit 0 9

从日志看出,searcher的确换了新的

此后你再重新搜索，结果果然更新了