Lucene同时索引和搜索

Question

I want to search with Lucene on an index. The index is changed frequently. So I need to do something to search and index at the same time. It's a web application on Tomcat. And I want to use RAMDeirectory to increase the searching speed. I don't know how to do it!

Answer 1

NRTManager in the misc Lucene package provides the ability to search and index at the same time.

TrackingIndexWriter writer; // your writer
SearcherFactory factory = new SearcherFactory();
NRTManager mgr = new NRTManager(writer, factory);

Check NRTManager methods for more info.

Answer 2

You can search and index at the same time using the same index. Look at Lucene's near real time search .

Some example code from the wiki,

IndexWriter writer; // create an IndexWriter here
Document doc = null; // create a document here
writer.addDocument(doc); // update a document
IndexReader reader = writer.getReader(); // get a reader with the new doc
Document addedDoc = reader.document(0);

Answer 3

You have to do that either doing a

1. Batch/overnight operations rebuilding the indexes.
2. Do that asynch way....

Depends on the requirement, what latency you need.