GH-2061 use filechannel and faster serialization

Signed-off-by:Bart Hanssens <[email protected]>
eclipse-rdf4j · Apr 16, 2021 · 77b6e60 · 77b6e60
1 parent f8588be
commit 77b6e60
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/...tion/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/iterator/GroupIterator.java b/...tion/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/iterator/GroupIterator.java
@@ -50,6 +50,7 @@
 
 import org.mapdb.DB;
 import org.mapdb.DBMaker;
+import org.mapdb.Serializer;
 
 /**
  * @author David Huynh
@@ -102,6 +103,7 @@ public GroupIterator(EvaluationStrategy strategy, Group group, BindingSet parent
 		if (this.iterationCacheSyncThreshold > 0) {
 			this.db = DBMaker.tempFileDB()
 					.fileDeleteAfterClose()
+					.fileChannelEnable()
 					.closeOnJvmShutdown()
 					.make();
 		} else {
@@ -152,7 +154,7 @@ protected void handleClose() throws QueryEvaluationException {
 
 	private <T> Set<T> createSet(String setName) {
 		if (db != null) {
-			return (Set<T>) db.hashSet(setName).create();
+			return (Set<T>) db.hashSet(setName).serializer(Serializer.JAVA).create();
 		} else {
 			return new HashSet<>();
 		}