From 927aaa95a64355da72c5b014b25363e9f4bebe41 Mon Sep 17 00:00:00 2001
From: orbiter <mc@yacy.net>
Date: Wed, 13 Aug 2014 00:59:11 +0200
Subject: [PATCH] concurrency bugfix

---
 source/net/yacy/search/schema/CollectionConfiguration.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source/net/yacy/search/schema/CollectionConfiguration.java b/source/net/yacy/search/schema/CollectionConfiguration.java
index 178ca8005..898179b7a 100644
--- a/source/net/yacy/search/schema/CollectionConfiguration.java
+++ b/source/net/yacy/search/schema/CollectionConfiguration.java
@@ -96,6 +96,7 @@ import org.apache.solr.common.SolrDocument;
 import org.apache.solr.common.SolrDocumentList;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.SolrInputDocument;
+import org.eclipse.jetty.util.ConcurrentHashSet;
 
 
 public class CollectionConfiguration extends SchemaConfiguration implements Serializable {
@@ -1228,7 +1229,7 @@ public class CollectionConfiguration extends SchemaConfiguration implements Seri
         
         // process all documents in collection
         final Map<String, Long> hostExtentCache = new HashMap<String, Long>(); // a mapping from the host id to the number of documents which contain this host-id
-        final Set<String> uniqueURLs = new HashSet<String>();
+        final Set<String> uniqueURLs = new ConcurrentHashSet<String>(); // will be used in a concurrent environment
         try {
             final Set<String> omitFields = new HashSet<String>();
             omitFields.add(CollectionSchema.process_sxt.getSolrFieldName());