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https://issues.apache.org/jira/browse/LUCENE-3409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094388#comment-13094388
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Gilad Barkai commented on LUCENE-3409:
--------------------------------------
This issue is relevant for trunk as well.
Please update the Affected versions accordingly.
> NRT reader/writer over RAMDirectory memory leak
> -----------------------------------------------
>
> Key: LUCENE-3409
> URL: https://issues.apache.org/jira/browse/LUCENE-3409
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.0.2, 3.3
> Reporter: tal steier
>
> with NRT reader/writer, emptying an index using:
> writer.deleteAll()
> writer.commit()
> doesn't release all allocated memory.
> for example the following code will generate a memory leak:
> /**
> * Reveals a memory leak in NRT reader/writer<br>
> *
> * The following main() does 10K cycles of:
> * <ul>
> * <li>Add 10K empty documents to index writer</li>
> * <li>commit()</li>
> * <li>open NRT reader over the writer, and immediately close it</li>
> * <li>delete all documents from the writer</li>
> * <li>commit changes to the writer</li>
> * </ul>
> *
> * Running with -Xmx256M results in an OOME after ~2600 cycles
> */
> public static void main(String[] args) throws Exception {
> RAMDirectory d = new RAMDirectory();
> IndexWriter w = new IndexWriter(d, new
> IndexWriterConfig(Version.LUCENE_33, new KeywordAnalyzer()));
> Document doc = new Document();
>
> for(int i = 0; i < 10000; i++) {
> for(int j = 0; j < 10000; ++j) {
> w.addDocument(doc);
> }
> w.commit();
> IndexReader.open(w, true).close();
> w.deleteAll();
> w.commit();
> }
>
> w.close();
> d.close();
> }
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