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From tillrohrmann <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2106] [runtime] add Left-, Right- and F...
Date Tue, 25 Aug 2015 08:28:00 GMT
Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1052#discussion_r37843359
  
    --- 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
    +		final DriverStrategy ls = config.getDriverStrategy();
    +		
    +		final MutableObjectIterator<IT1> in1 = this.taskContext.getInput(0);
    +		final MutableObjectIterator<IT2> in2 = this.taskContext.getInput(1);
    +
    +		// get the key positions and types
    +		final TypeSerializer<IT1> serializer1 = this.taskContext.<IT1>getInputSerializer(0).getSerializer();
    +		final TypeSerializer<IT2> serializer2 = this.taskContext.<IT2>getInputSerializer(1).getSerializer();
    +		final TypeComparator<IT1> comparator1 = this.taskContext.getDriverComparator(0);
    +		final TypeComparator<IT2> comparator2 = this.taskContext.getDriverComparator(1);
    +		
    +		final TypePairComparatorFactory<IT1, IT2> pairComparatorFactory = config.getPairComparatorFactory(
    +				this.taskContext.getUserCodeClassLoader());
    --- End diff --
    
    line break


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