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: 3.3, 3.0.2
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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