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copied!<p><code>Directory.copy()</code> overwrites the destination directory, you need to use <code>IndexWriter.addIndexes()</code> to merge the new directory indices into the main one.</p> <p>You can also just re-open the main index and add documents to it directly. A RAMDirectory isn't necessarily more efficient than properly tuned buffer and merge factor settings (see <code>IndexWriter</code> docs).</p> <p>Update: instead of <code>Directory.copy()</code> you need to open <code>ramDir</code> for reading and <code>indexDir</code> for writing and call <code>.addIndexes</code> on the <code>indexDir</code> writer and pass it the <code>ramDir</code> reader. Alternatively, you can use <code>.addIndexesNoOptimize</code> and pass it <code>ramDir</code> directly (without opening a reader) and optimize the index before closing.</p> <p>But really, it's probably easier to just skip the RAMDir and open a writer on <code>indexDir</code> in the first place. Will make it easier to update changed files as well.</p> <p><strong>Example</strong></p> <pre><code>private int index(File indexDir, File dataDir, String suffix) throws Exception { RAMDirectory ramDir = new RAMDirectory(); IndexWriter indexWriter = new IndexWriter(ramDir, new StandardAnalyzer(Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.UNLIMITED); indexWriter.setUseCompoundFile(false); indexDirectory(indexWriter, dataDir, suffix); int numIndexed = indexWriter.maxDoc(); indexWriter.optimize(); indexWriter.close(); IndexWriter index = new IndexWriter(FSDirectory.open(indexDir), new StandardAnalyzer(Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.UNLIMITED); index.addIndexesNoOptimize(ramDir); index.optimize(); index.close(); return numIndexed; } </code></pre> <p>But, just this is fine too:</p> <pre><code>private int index(File indexDir, File dataDir, String suffix) throws Exception { IndexWriter index = new IndexWriter(FSDirectory.open(indexDir), new StandardAnalyzer(Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.UNLIMITED); // tweak the settings for your hardware index.setUseCompoundFile(false); index.setRAMBufferSizeMB(256); index.setMergeFactor(30); indexDirectory(index, dataDir, suffix); index.optimize(); int numIndexed = index.maxDoc(); index.close(); // you'll need to update indexDirectory() to keep track of indexed files return numIndexed; } </code></pre>

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