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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1292) Tag Index
Date Wed, 21 May 2008 14:07:55 GMT
Tag Index
---------

                 Key: LUCENE-1292
                 URL: https://issues.apache.org/jira/browse/LUCENE-1292
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Index
    Affects Versions: 2.3.1
            Reporter: Jason Rutherglen


The problem the tag index solves is slow field cache loading and range queries, and reindexing
an entire document to update fields that are not tokenized.  

The tag index holds untokenized terms with a docfreq of 1 in a term dictionary like index
file.  The file also stores the docs per term, similar to LUCENE-1278.  The index also has
a transaction log and in memory index for realtime updates to the tags.  The transaction log
is periodically merged into the existing tag term dictionary index file.

The TagIndexReader extends IndexReader and is unified with a regular index by ParallelReader.
 There is a doc id to terms skip pointer file for the IndexReader.document method.  This file
contains a pointer for looking up the terms for a document.  

There is a higher level class that encapsulates writing a document with tag fields to IndexWriter
and TagIndexWriter.  This requires a hook into IndexWriter to coordinate doc ids and flushing
segments to disk.  

The writer class could be as simple as:
{code}
public class TagIndexWriter {
  
  public void add(Term term, DocIdSetIterator iterator) {
  }
  
  public void delete(Term term, DocIdSetIterator iterator) {
  }
}
{code}

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