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From "Thomas Connolly (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-842) ParallelMultiSearcher memory leak
Date Thu, 22 Mar 2007 09:15:32 GMT
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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