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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/support/clusterControl/WriteAfterClusterCollectTest2.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/support/clusterControl/WriteAfterClusterCollectTest2.java
new file mode 100644
index 000000000..91cce6d33
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/support/clusterControl/WriteAfterClusterCollectTest2.java
@@ -0,0 +1,124 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.api.support.clusterControl;
+
+import java.util.Collection;
+
+import org.junit.Test;
+import org.simantics.databoard.Bindings;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.WriteOnlyGraph;
+import org.simantics.db.common.request.WriteOnlyResultRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.service.ClusterControl;
+import org.simantics.db.testing.base.ExistingDatabaseTest;
+import org.simantics.db.testing.common.WriteQuery;
+import org.simantics.db.tests.common.Configuration;
+import org.simantics.layer0.Layer0;
+
+/**
+ * Creates large amount of instances in multiple transactions
+ * and the tries to verify that instances are written into the database.
+ * 
+ * @author Marko Luukkainen <marko.luukkainen@vtt.fi>
+ *
+ */
+public class WriteAfterClusterCollectTest2 extends ExistingDatabaseTest {
+	private int LOOP = Configuration.get().collectedLoopCount;
+	@Test
+	public void test() throws Exception{
+
+	    final String random = getRandomString();
+		
+		final Resource rootLib = getSession().syncRequest(new WriteOnlyResultRequest<Resource>() {
+		    @Override
+		    public Resource perform(WriteOnlyGraph g) throws DatabaseException {
+		    	Resource rootLib = g.newResource();
+                for (int i = 0; i < 10; i++) {
+    		        for (int j = 0; j < LOOP; j++) {
+    		            Layer0 b = Layer0.getInstance(getSession());
+    		            String newInstanceName = random + i;
+    		            Resource instance = g.newResource();
+    		            g.claim(instance, b.InstanceOf, null, b.Type);
+    		            g.addLiteral(instance, b.HasName, b.NameOf, b.String, newInstanceName, Bindings.STRING);
+    		            g.claim(rootLib, b.ConsistsOf, b.PartOf, instance);
+    		            g.flushCluster();
+    		        }
+                }
+                return rootLib;
+		    }
+		});
+		
+		checkException();
+		
+		getSession().syncRequest(new TestReadRequest() {
+			@Override
+			public void run(ReadGraph g) throws Throwable {
+				Layer0 b = Layer0.getInstance(g);
+				Collection<Resource> resources = g.getObjects(rootLib, b.ConsistsOf);
+				for (Resource r : resources) {
+					String name = g.getPossibleRelatedValue(r, b.HasName);
+					if (DEBUG)
+					    System.out.println("Name is " + name);
+				}
+			}
+		});
+		
+		ClusterControl support = getSession().getService(ClusterControl.class);
+		support.collectClusters(Integer.MAX_VALUE);
+		
+		checkException();
+		
+        getSession().syncRequest(new WriteQuery(this) {
+            @Override
+            public void run(WriteGraph g) throws Throwable {
+                
+                Layer0 b = Layer0.getInstance(g);
+                Collection<Resource> resources = g.getObjects(rootLib, b.ConsistsOf);
+                for (Resource r : resources) {
+                    String name = g.getPossibleRelatedValue(r, b.HasName);
+                    if (DEBUG)
+                        System.out.println("Name is " + name);
+                    String newInstanceName = random;
+                    Resource instance = g.newResource();
+                    g.claimLiteral(instance, b.HasName, newInstanceName);
+                    g.claim(r, b.ConsistsOf, b.PartOf, instance);
+                }
+                
+            }
+            
+        });
+        
+        checkException();
+
+        getSession().syncRequest(new TestReadRequest() {
+            @Override
+            public void run(ReadGraph g) throws Throwable {
+                Layer0 b = Layer0.getInstance(g);
+                Collection<Resource> resources = g.getObjects(rootLib, b.ConsistsOf);
+                for (Resource r : resources) {
+                    String name = g.getPossibleRelatedValue(r, b.HasName);
+                    if (DEBUG)
+                        System.out.println("Name is " + name);
+                }
+            }
+        });
+        
+        checkException();
+
+        support.collectClusters(Integer.MAX_VALUE);
+		
+	}
+
+}