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POLucene indexing - lots of docs/phrases
 

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  1. POLucene indexing - lots of docs/phrases
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    <p>What approach should I use in indexing following set of files.</p> <p>Each file contains around 500k lines of characters (400MB) - characters are not words, they are, lets say for sake of question random characters, without spaces.</p> <p>I need to be able to find each line which contains given 12-character string, for example:</p> <p>line: AXXXXXXXXXXXXJJJJKJIDJUD....ect up to 200 chars</p> <p>interesting part: <strong>XXXXXXXXXXXX</strong></p> <p>While searching, I'm only interested in characters 1-13 (so <strong>XXXXXXXXXXXX</strong>). After the search I would like to be able to read line containing <strong>XXXXXXXXXXXX</strong> without looping through the file. </p> <p>I wrote following poc (simplified for question:</p> <p>Indexing:</p> <pre><code> while ( (line = br.readLine()) != null ) { doc = new Document(); Field fileNameField = new StringField(FILE_NAME, file.getName(), Field.Store.YES); doc.add(fileNameField); Field characterOffset = new IntField(CHARACTER_OFFSET, charsRead, Field.Store.YES); doc.add(characterOffset); String id = ""; try { id = line.substring(1, 13); doc.add(new TextField(CONTENTS, id, Field.Store.YES)); writer.addDocument(doc); } catch ( IndexOutOfBoundsException ior ) { //cut off for sake of question } finally { //simplified snipped for sake of question. characterOffset is amount of chars to skip which reading a file (ultimately bytes read) charsRead += line.length() + 2; } } </code></pre> <p>Searching:</p> <pre><code>RegexpQuery q = new RegexpQuery(new Term(CONTENTS, id), RegExp.NONE); //cause id can be a regexp concernign 12char string TopDocs results = searcher.search(q, Integer.MAX_VALUE); ScoreDoc[] hits = results.scoreDocs; int numTotalHits = results.totalHits; Map&lt;String, Set&lt;Integer&gt;&gt; fileToOffsets = new HashMap&lt;String, Set&lt;Integer&gt;&gt;(); for ( int i = 0; i &lt; numTotalHits; i++ ) { Document doc = searcher.doc(hits[i].doc); String fileName = doc.get(FILE_NAME); if ( fileName != null ) { String foundIds = doc.get(CONTENTS); Set&lt;Integer&gt; offsets = fileToOffsets.get(fileName); if ( offsets == null ) { offsets = new HashSet&lt;Integer&gt;(); fileToOffsets.put(fileName, offsets); } String offset = doc.get(CHARACTER_OFFSET); offsets.add(Integer.parseInt(offset)); } } </code></pre> <p>The problem with this approach is that, it will create one doc per line. </p> <p>Can you please give me hints how to approach this problem with lucene and if lucene is a way to go here?</p>
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