| /** |
| * 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.hadoop.mapreduce.lib.input; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.util.List; |
| |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.Mapper; |
| |
| public class TestDelegatingInputFormat extends TestCase { |
| |
| @SuppressWarnings("unchecked") |
| public void testSplitting() throws Exception { |
| Job job = Job.getInstance(); |
| MiniDFSCluster dfs = null; |
| try { |
| dfs = new MiniDFSCluster.Builder(job.getConfiguration()).numDataNodes(4) |
| .racks(new String[] { "/rack0", "/rack0", "/rack1", "/rack1" }) |
| .hosts(new String[] { "host0", "host1", "host2", "host3" }) |
| .build(); |
| FileSystem fs = dfs.getFileSystem(); |
| |
| Path path = getPath("/foo/bar", fs); |
| Path path2 = getPath("/foo/baz", fs); |
| Path path3 = getPath("/bar/bar", fs); |
| Path path4 = getPath("/bar/baz", fs); |
| |
| final int numSplits = 100; |
| |
| FileInputFormat.setMaxInputSplitSize(job, |
| fs.getFileStatus(path).getLen() / numSplits); |
| MultipleInputs.addInputPath(job, path, TextInputFormat.class, |
| MapClass.class); |
| MultipleInputs.addInputPath(job, path2, TextInputFormat.class, |
| MapClass2.class); |
| MultipleInputs.addInputPath(job, path3, KeyValueTextInputFormat.class, |
| MapClass.class); |
| MultipleInputs.addInputPath(job, path4, TextInputFormat.class, |
| MapClass2.class); |
| DelegatingInputFormat inFormat = new DelegatingInputFormat(); |
| |
| int[] bins = new int[3]; |
| for (InputSplit split : (List<InputSplit>)inFormat.getSplits(job)) { |
| assertTrue(split instanceof TaggedInputSplit); |
| final TaggedInputSplit tis = (TaggedInputSplit) split; |
| int index = -1; |
| |
| if (tis.getInputFormatClass().equals(KeyValueTextInputFormat.class)) { |
| // path3 |
| index = 0; |
| } else if (tis.getMapperClass().equals(MapClass.class)) { |
| // path |
| index = 1; |
| } else { |
| // path2 and path4 |
| index = 2; |
| } |
| |
| bins[index]++; |
| } |
| |
| assertEquals("count is not equal to num splits", numSplits, bins[0]); |
| assertEquals("count is not equal to num splits", numSplits, bins[1]); |
| assertEquals("count is not equal to 2 * num splits", |
| numSplits * 2, bins[2]); |
| } finally { |
| if (dfs != null) { |
| dfs.shutdown(); |
| } |
| } |
| } |
| |
| static Path getPath(final String location, final FileSystem fs) |
| throws IOException { |
| Path path = new Path(location); |
| |
| // create a multi-block file on hdfs |
| DataOutputStream out = fs.create(path, true, 4096, (short) 2, 512, null); |
| for (int i = 0; i < 1000; ++i) { |
| out.writeChars("Hello\n"); |
| } |
| out.close(); |
| |
| return path; |
| } |
| |
| static class MapClass extends Mapper<String, String, String, String> { |
| } |
| |
| static class MapClass2 extends MapClass { |
| } |
| |
| } |