ParallelMultiSearcher memory leak
---------------------------------
Key: LUCENE-842
URL: https://issues.apache.org/jira/browse/LUCENE-842
Project: Lucene - Java
Issue Type: Bug
Components: Search
Affects Versions: 2.1
Environment: Windows XP SP1 and Red Hat EL 4
Reporter: Thomas Connolly
Priority: Critical
When using the org.apache.lucene.search.ParallelMultiSearcher to search on a
single searcher (reading a single index), continuous runs result in a memory
leak.
Substituting the MultiSearcher does not result in a memory leak. and is the
workaround currently used.
And example of the code used is as follows. Note the close routine was added
for the individual searchers and the MultiSearcher otherwise the was a leak in
MultiSearcher.
private void doSearch(Search search)
{
IndexSearcher[] indexSearchers = null;
MultiSearcher multiSearcher = null;
try
{
indexSearchers = getIndexSearcher();
// aggregate the searches across multiple indexes
//multiSearcher = new ParallelMultiSearcher(indexSearchers);
multiSearcher = new MultiSearcher(indexSearchers);
final QueryParser parser = new QueryParser("content", new
ExtendedStandardAnalyser());
final Query query = parser.parse(search.getQuery());
final Hits hits = multiSearcher.search(query,
getFilter(search.getFilters()), getSort(search.getSort()));
// process hits...
}
finally
{
close(indexSearchers);
close(multiSearcher);
}
}
/**
* Close the index searchers.
*
* @param indexSearchers Index Searchers.
*/
private static void close(IndexSearcher[] indexSearchers)
{
if (indexSearchers != null)
{
for (IndexSearcher indexSearcher : indexSearchers)
{
try
{
indexSearcher.close();
}
catch (IOException ioex)
{
LOGGER.warn("Unable to close the index searcher!", ioex);
}
}
}
}
/**
* Close the multi-searcher.
*
* @param aMultiSearcher Index Searchers.
*/
private static void close(MultiSearcher aMultiSearcher)
{
try
{
aMultiSearcher.close();
}
catch (IOException ioex)
{
LOGGER.warn("Unable to close the multi searcher!", ioex);
}
}
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