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* 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.tools.mapred.lib;
import org.apache.hadoop.tools.DistCpConstants;
import org.junit.Assert;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.mapreduce.task.JobContextImpl;
import org.apache.hadoop.tools.CopyListing;
import org.apache.hadoop.tools.CopyListingFileStatus;
import org.apache.hadoop.tools.DistCpOptions;
import org.apache.hadoop.tools.StubContext;
import org.apache.hadoop.security.Credentials;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import java.io.DataOutputStream;
import java.util.ArrayList;
import java.util.List;
public class TestDynamicInputFormat {
private static final Log LOG = LogFactory.getLog(TestDynamicInputFormat.class);
private static MiniDFSCluster cluster;
private static final int N_FILES = 1000;
private static final int NUM_SPLITS = 7;
private static final Credentials CREDENTIALS = new Credentials();
private static List<String> expectedFilePaths = new ArrayList<String>(N_FILES);
@BeforeClass
public static void setup() throws Exception {
cluster = new MiniDFSCluster.Builder(getConfigurationForCluster())
.numDataNodes(1).format(true).build();
for (int i=0; i<N_FILES; ++i)
createFile("/tmp/source/" + String.valueOf(i));
FileSystem fileSystem = cluster.getFileSystem();
expectedFilePaths.add(fileSystem.listStatus(
new Path("/tmp/source/0"))[0].getPath().getParent().toString());
}
private static Configuration getConfigurationForCluster() {
Configuration configuration = new Configuration();
System.setProperty("test.build.data",
"target/tmp/build/TEST_DYNAMIC_INPUT_FORMAT/data");
configuration.set("hadoop.log.dir", "target/tmp");
LOG.debug("fs.default.name == " + configuration.get("fs.default.name"));
LOG.debug("dfs.http.address == " + configuration.get("dfs.http.address"));
return configuration;
}
private static DistCpOptions getOptions() throws Exception {
Path sourcePath = new Path(cluster.getFileSystem().getUri().toString()
+ "/tmp/source");
Path targetPath = new Path(cluster.getFileSystem().getUri().toString()
+ "/tmp/target");
List<Path> sourceList = new ArrayList<Path>();
sourceList.add(sourcePath);
DistCpOptions options = new DistCpOptions(sourceList, targetPath);
options.setMaxMaps(NUM_SPLITS);
return options;
}
private static void createFile(String path) throws Exception {
FileSystem fileSystem = null;
DataOutputStream outputStream = null;
try {
fileSystem = cluster.getFileSystem();
outputStream = fileSystem.create(new Path(path), true, 0);
expectedFilePaths.add(fileSystem.listStatus(
new Path(path))[0].getPath().toString());
}
finally {
IOUtils.cleanup(null, fileSystem, outputStream);
}
}
@AfterClass
public static void tearDown() {
cluster.shutdown();
}
@Test
public void testGetSplits() throws Exception {
DistCpOptions options = getOptions();
Configuration configuration = new Configuration();
configuration.set("mapred.map.tasks",
String.valueOf(options.getMaxMaps()));
CopyListing.getCopyListing(configuration, CREDENTIALS, options).buildListing(
new Path(cluster.getFileSystem().getUri().toString()
+"/tmp/testDynInputFormat/fileList.seq"), options);
JobContext jobContext = new JobContextImpl(configuration, new JobID());
DynamicInputFormat<Text, CopyListingFileStatus> inputFormat =
new DynamicInputFormat<Text, CopyListingFileStatus>();
List<InputSplit> splits = inputFormat.getSplits(jobContext);
int nFiles = 0;
int taskId = 0;
for (InputSplit split : splits) {
RecordReader<Text, CopyListingFileStatus> recordReader =
inputFormat.createRecordReader(split, null);
StubContext stubContext = new StubContext(jobContext.getConfiguration(),
recordReader, taskId);
final TaskAttemptContext taskAttemptContext
= stubContext.getContext();
recordReader.initialize(splits.get(0), taskAttemptContext);
float previousProgressValue = 0f;
while (recordReader.nextKeyValue()) {
CopyListingFileStatus fileStatus = recordReader.getCurrentValue();
String source = fileStatus.getPath().toString();
System.out.println(source);
Assert.assertTrue(expectedFilePaths.contains(source));
final float progress = recordReader.getProgress();
Assert.assertTrue(progress >= previousProgressValue);
Assert.assertTrue(progress >= 0.0f);
Assert.assertTrue(progress <= 1.0f);
previousProgressValue = progress;
++nFiles;
}
Assert.assertTrue(recordReader.getProgress() == 1.0f);
++taskId;
}
Assert.assertEquals(expectedFilePaths.size(), nFiles);
}
@Test
public void testGetSplitRatio() throws Exception {
Assert.assertEquals(1, DynamicInputFormat.getSplitRatio(1, 1000000000));
Assert.assertEquals(2, DynamicInputFormat.getSplitRatio(11000000, 10));
Assert.assertEquals(4, DynamicInputFormat.getSplitRatio(30, 700));
Assert.assertEquals(2, DynamicInputFormat.getSplitRatio(30, 200));
// Tests with negative value configuration
Configuration conf = new Configuration();
conf.setInt(DistCpConstants.CONF_LABEL_MAX_CHUNKS_TOLERABLE, -1);
conf.setInt(DistCpConstants.CONF_LABEL_MAX_CHUNKS_IDEAL, -1);
conf.setInt(DistCpConstants.CONF_LABEL_MIN_RECORDS_PER_CHUNK, -1);
conf.setInt(DistCpConstants.CONF_LABEL_SPLIT_RATIO, -1);
Assert.assertEquals(1,
DynamicInputFormat.getSplitRatio(1, 1000000000, conf));
Assert.assertEquals(2,
DynamicInputFormat.getSplitRatio(11000000, 10, conf));
Assert.assertEquals(4, DynamicInputFormat.getSplitRatio(30, 700, conf));
Assert.assertEquals(2, DynamicInputFormat.getSplitRatio(30, 200, conf));
// Tests with valid configuration
conf.setInt(DistCpConstants.CONF_LABEL_MAX_CHUNKS_TOLERABLE, 100);
conf.setInt(DistCpConstants.CONF_LABEL_MAX_CHUNKS_IDEAL, 30);
conf.setInt(DistCpConstants.CONF_LABEL_MIN_RECORDS_PER_CHUNK, 10);
conf.setInt(DistCpConstants.CONF_LABEL_SPLIT_RATIO, 53);
Assert.assertEquals(53, DynamicInputFormat.getSplitRatio(3, 200, conf));
}
}