Github user rvesse commented on a diff in the pull request:
https://github.com/apache/jena/pull/424#discussion_r189542491
--- Diff:
jena-db/jena-tdb2/src/main/java/org/apache/jena/tdb2/loader/parallel/LoaderParallel.java
---
@@ -0,0 +1,155 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.jena.tdb2.loader.parallel;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+
+import org.apache.jena.atlas.lib.tuple.Tuple;
+import org.apache.jena.graph.Node;
+import org.apache.jena.riot.system.StreamRDF;
+import org.apache.jena.sparql.core.DatasetGraph;
+import org.apache.jena.tdb2.loader.DataLoader;
+import org.apache.jena.tdb2.loader.base.LoaderBase;
+import org.apache.jena.tdb2.loader.base.LoaderOps;
+import org.apache.jena.tdb2.loader.base.MonitorOutput;
+import org.apache.jena.tdb2.store.DatasetGraphTDB;
+import org.apache.jena.tdb2.store.DatasetPrefixesTDB;
+import org.apache.jena.tdb2.store.NodeId;
+import org.apache.jena.tdb2.sys.TDBInternal;
+
+/**
+ * The parallel Loader.
+ * <p>
+ * The process is:
+ * <blockquote>
+ * {@code DataBatcher -> DataToTuples -> Indexer}
+ * <blockquote>
+ * {@link DataBatcher} produces {@link DataBlock}s - grouping of triples
and quads. It uses
+ * <br/>
+ * {@link DataToTuples} processes {@link DataBlock} to create 2 outputs
blocks of {@code Tuple<NodeId>}, one output for triples, oue for quads.
--- End diff --
Typo `oue` -> `one`
---
