Tag Index
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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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