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https://issues.apache.org/jira/browse/FLINK-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14713394#comment-14713394
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ASF GitHub Bot commented on FLINK-2106:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1052#discussion_r37979451
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/operators/AbstractOuterJoinDriver.java
---
@@ -0,0 +1,166 @@
+/*
+ * 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.flink.runtime.operators;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.functions.FlatJoinFunction;
+import org.apache.flink.api.common.typeutils.TypeComparator;
+import org.apache.flink.api.common.typeutils.TypePairComparatorFactory;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.runtime.io.disk.iomanager.IOManager;
+import org.apache.flink.runtime.memorymanager.MemoryManager;
+import org.apache.flink.runtime.operators.util.JoinTaskIterator;
+import org.apache.flink.runtime.operators.util.TaskConfig;
+import org.apache.flink.util.Collector;
+import org.apache.flink.util.MutableObjectIterator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The abstract outer join driver implements the logic of an outer join
operator at runtime. It instantiates a
+ * sort-merge based strategy to find joining pairs of records or joining
records with null depending
+ * on the outer join type.
+ *
+ * @see FlatJoinFunction
+ */
+public abstract class AbstractOuterJoinDriver<IT1, IT2, OT> implements
PactDriver<FlatJoinFunction<IT1, IT2, OT>, OT> {
+
+ protected static final Logger LOG =
LoggerFactory.getLogger(AbstractOuterJoinDriver.class);
+
+ protected PactTaskContext<FlatJoinFunction<IT1, IT2, OT>, OT>
taskContext;
+
+ protected volatile JoinTaskIterator<IT1, IT2, OT> outerJoinIterator; //
the iterator that does the actual outer join
+ protected volatile boolean running;
+
+ //
------------------------------------------------------------------------
+
+ @Override
+ public void setup(PactTaskContext<FlatJoinFunction<IT1, IT2, OT>, OT>
context) {
+ this.taskContext = context;
+ this.running = true;
+ }
+
+ @Override
+ public int getNumberOfInputs() {
+ return 2;
+ }
+
+ @Override
+ public Class<FlatJoinFunction<IT1, IT2, OT>> getStubType() {
+ @SuppressWarnings("unchecked")
+ final Class<FlatJoinFunction<IT1, IT2, OT>> clazz =
(Class<FlatJoinFunction<IT1, IT2, OT>>) (Class<?>) FlatJoinFunction.class;
+ return clazz;
+ }
+
+ @Override
+ public int getNumberOfDriverComparators() {
+ return 2;
+ }
+
+ @Override
+ public void prepare() throws Exception{
+ final TaskConfig config = this.taskContext.getTaskConfig();
+
+ // obtain task manager's memory manager and I/O manager
+ final MemoryManager memoryManager =
this.taskContext.getMemoryManager();
+ final IOManager ioManager = this.taskContext.getIOManager();
+
+ // set up memory and I/O parameters
+ final double fractionAvailableMemory =
config.getRelativeMemoryDriver();
+ final int numPages =
memoryManager.computeNumberOfPages(fractionAvailableMemory);
+
+ // test minimum memory requirements
--- End diff --
unrelated comment
> Add outer joins to Runtime
> --------------------------
>
> Key: FLINK-2106
> URL: https://issues.apache.org/jira/browse/FLINK-2106
> Project: Flink
> Issue Type: Sub-task
> Components: Local Runtime
> Reporter: Fabian Hueske
> Assignee: Ricky Pogalz
> Priority: Minor
> Fix For: pre-apache
>
>
> Add left/right/full outer join methods to the runtime of Flink.
> Initially, the execution strategy should be a sort-merge outer join
> (FLINK-2105) but can later be extended to hash joins for left/right outer
> joins.
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