TestDynamicInputFormat.java
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.tools.mapred.lib;
import org.apache.hadoop.tools.DistCpConstants;
import org.apache.hadoop.tools.DistCpContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class TestDynamicInputFormat {
private static final Logger LOG = LoggerFactory.getLogger(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);
@BeforeAll
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);
return new DistCpOptions.Builder(sourceList, targetPath)
.maxMaps(NUM_SPLITS)
.build();
}
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.cleanupWithLogger(null, fileSystem, outputStream);
}
}
@AfterAll
public static void tearDown() {
cluster.shutdown();
}
@Test
public void testGetSplits() throws Exception {
final DistCpContext context = new DistCpContext(getOptions());
Configuration configuration = new Configuration();
configuration.set("mapred.map.tasks",
String.valueOf(context.getMaxMaps()));
CopyListing.getCopyListing(configuration, CREDENTIALS, context)
.buildListing(new Path(cluster.getFileSystem().getUri().toString()
+"/tmp/testDynInputFormat/fileList.seq"), context);
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) {
StubContext stubContext = new StubContext(jobContext.getConfiguration(),
null, taskId);
final TaskAttemptContext taskAttemptContext
= stubContext.getContext();
RecordReader<Text, CopyListingFileStatus> recordReader =
inputFormat.createRecordReader(split, taskAttemptContext);
stubContext.setReader(recordReader);
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);
assertTrue(expectedFilePaths.contains(source));
final float progress = recordReader.getProgress();
assertTrue(progress >= previousProgressValue);
assertTrue(progress >= 0.0f);
assertTrue(progress <= 1.0f);
previousProgressValue = progress;
++nFiles;
}
assertTrue(recordReader.getProgress() == 1.0f);
++taskId;
}
assertEquals(expectedFilePaths.size(), nFiles);
}
@Test
public void testGetSplitRatio() throws Exception {
assertEquals(1, DynamicInputFormat.getSplitRatio(1, 1000000000));
assertEquals(2, DynamicInputFormat.getSplitRatio(11000000, 10));
assertEquals(4, DynamicInputFormat.getSplitRatio(30, 700));
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);
assertEquals(1,
DynamicInputFormat.getSplitRatio(1, 1000000000, conf));
assertEquals(2,
DynamicInputFormat.getSplitRatio(11000000, 10, conf));
assertEquals(4, DynamicInputFormat.getSplitRatio(30, 700, conf));
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);
assertEquals(53, DynamicInputFormat.getSplitRatio(3, 200, conf));
}
@Test
public void testDynamicInputChunkContext() throws IOException {
Configuration configuration = new Configuration();
configuration.set(DistCpConstants.CONF_LABEL_LISTING_FILE_PATH,
"/tmp/test/file1.seq");
DynamicInputFormat firstInputFormat = new DynamicInputFormat();
DynamicInputFormat secondInputFormat = new DynamicInputFormat();
DynamicInputChunkContext firstContext =
firstInputFormat.getChunkContext(configuration);
DynamicInputChunkContext secondContext =
firstInputFormat.getChunkContext(configuration);
DynamicInputChunkContext thirdContext =
secondInputFormat.getChunkContext(configuration);
DynamicInputChunkContext fourthContext =
secondInputFormat.getChunkContext(configuration);
assertTrue(firstContext.equals(secondContext),
"Chunk contexts from the same DynamicInputFormat " +
"object should be the same.");
assertTrue(thirdContext.equals(fourthContext),
"Chunk contexts from the same DynamicInputFormat " +
"object should be the same.");
assertTrue(!firstContext.equals(thirdContext),
"Contexts from different DynamicInputFormat " +
"objects should be different.");
}
}