/**
* 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.IOException;
import java.util.List;
import java.util.ArrayList;
import junit.framework.TestCase;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
public class TestCombineFileInputFormat extends TestCase {
private static final String rack1[] = new String[] {
"/r1"
};
private static final String hosts1[] = new String[] {
"host1.rack1.com"
};
private static final String rack2[] = new String[] {
"/r2"
};
private static final String hosts2[] = new String[] {
"host2.rack2.com"
};
private static final String rack3[] = new String[] {
"/r3"
};
private static final String hosts3[] = new String[] {
"host3.rack3.com"
};
final Path inDir = new Path("/racktesting");
final Path outputPath = new Path("/output");
final Path dir1 = new Path(inDir, "/dir1");
final Path dir2 = new Path(inDir, "/dir2");
final Path dir3 = new Path(inDir, "/dir3");
final Path dir4 = new Path(inDir, "/dir4");
static final int BLOCKSIZE = 1024;
static final byte[] databuf = new byte[BLOCKSIZE];
/** Dummy class to extend CombineFileInputFormat*/
private class DummyInputFormat extends CombineFileInputFormat<Text, Text> {
@Override
public RecordReader<Text,Text> createRecordReader(InputSplit split,
TaskAttemptContext context) throws IOException {
return null;
}
}
/** Dummy class to extend CombineFileInputFormat. It allows
* non-existent files to be passed into the CombineFileInputFormat, allows
* for easy testing without having to create real files.
*/
private class DummyInputFormat1 extends DummyInputFormat {
@Override
protected List<FileStatus> listStatus(JobContext job) throws IOException {
Path[] files = getInputPaths(job);
List<FileStatus> results = new ArrayList<FileStatus>();
for (int i = 0; i < files.length; i++) {
Path p = files[i];
FileSystem fs = p.getFileSystem(job.getConfiguration());
results.add(fs.getFileStatus(p));
}
return results;
}
}
private static final String DUMMY_KEY = "dummy.rr.key";
private static class DummyRecordReader extends RecordReader<Text, Text> {
private TaskAttemptContext context;
private CombineFileSplit s;
private int idx;
private boolean used;
public DummyRecordReader(CombineFileSplit split, TaskAttemptContext context,
Integer i) {
this.context = context;
this.idx = i;
this.s = split;
this.used = true;
}
/** @return a value specified in the context to check whether the
* context is properly updated by the initialize() method.
*/
public String getDummyConfVal() {
return this.context.getConfiguration().get(DUMMY_KEY);
}
public void initialize(InputSplit split, TaskAttemptContext context) {
this.context = context;
this.s = (CombineFileSplit) split;
// By setting used to true in the c'tor, but false in initialize,
// we can check that initialize() is always called before use
// (e.g., in testReinit()).
this.used = false;
}
public boolean nextKeyValue() {
boolean ret = !used;
this.used = true;
return ret;
}
public Text getCurrentKey() {
return new Text(this.context.getConfiguration().get(DUMMY_KEY));
}
public Text getCurrentValue() {
return new Text(this.s.getPath(idx).toString());
}
public float getProgress() {
return used ? 1.0f : 0.0f;
}
public void close() {
}
}
/** Extend CFIF to use CFRR with DummyRecordReader */
private class ChildRRInputFormat extends CombineFileInputFormat<Text, Text> {
@SuppressWarnings("unchecked")
@Override
public RecordReader<Text,Text> createRecordReader(InputSplit split,
TaskAttemptContext context) throws IOException {
return new CombineFileRecordReader((CombineFileSplit) split, context,
(Class) DummyRecordReader.class);
}
}
public void testRecordReaderInit() throws InterruptedException, IOException {
// Test that we properly initialize the child recordreader when
// CombineFileInputFormat and CombineFileRecordReader are used.
TaskAttemptID taskId = new TaskAttemptID("jt", 0, true, 0, 0);
Configuration conf1 = new Configuration();
conf1.set(DUMMY_KEY, "STATE1");
TaskAttemptContext context1 = new TaskAttemptContext(conf1, taskId);
// This will create a CombineFileRecordReader that itself contains a
// DummyRecordReader.
InputFormat inputFormat = new ChildRRInputFormat();
Path [] files = { new Path("file1") };
long [] lengths = { 1 };
CombineFileSplit split = new CombineFileSplit(files, lengths);
RecordReader rr = inputFormat.createRecordReader(split, context1);
assertTrue("Unexpected RR type!", rr instanceof CombineFileRecordReader);
// Verify that the initial configuration is the one being used.
// Right after construction the dummy key should have value "STATE1"
assertEquals("Invalid initial dummy key value", "STATE1",
rr.getCurrentKey().toString());
// Switch the active context for the RecordReader...
Configuration conf2 = new Configuration();
conf2.set(DUMMY_KEY, "STATE2");
TaskAttemptContext context2 = new TaskAttemptContext(conf2, taskId);
rr.initialize(split, context2);
// And verify that the new context is updated into the child record reader.
assertEquals("Invalid secondary dummy key value", "STATE2",
rr.getCurrentKey().toString());
}
public void testReinit() throws Exception {
// Test that a split containing multiple files works correctly,
// with the child RecordReader getting its initialize() method
// called a second time.
TaskAttemptID taskId = new TaskAttemptID("jt", 0, true, 0, 0);
Configuration conf = new Configuration();
TaskAttemptContext context = new TaskAttemptContext(conf, taskId);
// This will create a CombineFileRecordReader that itself contains a
// DummyRecordReader.
InputFormat inputFormat = new ChildRRInputFormat();
Path [] files = { new Path("file1"), new Path("file2") };
long [] lengths = { 1, 1 };
CombineFileSplit split = new CombineFileSplit(files, lengths);
RecordReader rr = inputFormat.createRecordReader(split, context);
assertTrue("Unexpected RR type!", rr instanceof CombineFileRecordReader);
// first initialize() call comes from MapTask. We'll do it here.
rr.initialize(split, context);
// First value is first filename.
assertTrue(rr.nextKeyValue());
assertEquals("file1", rr.getCurrentValue().toString());
// The inner RR will return false, because it only emits one (k, v) pair.
// But there's another sub-split to process. This returns true to us.
assertTrue(rr.nextKeyValue());
// And the 2nd rr will have its initialize method called correctly.
assertEquals("file2", rr.getCurrentValue().toString());
// But after both child RR's have returned their singleton (k, v), this
// should also return false.
assertFalse(rr.nextKeyValue());
}
public void testSplitPlacement() throws IOException {
MiniDFSCluster dfs = null;
FileSystem fileSys = null;
try {
/* Start 3 datanodes, one each in rack r1, r2, r3. Create three files
* 1) file1, just after starting the datanode on r1, with
* a repl factor of 1, and,
* 2) file2, just after starting the datanode on r2, with
* a repl factor of 2, and,
* 3) file3 after starting the all three datanodes, with a repl
* factor of 3.
* At the end, file1 will be present on only datanode1, file2 will be
* present on datanode 1 and datanode2 and
* file3 will be present on all datanodes.
*/
Configuration conf = new Configuration();
conf.setBoolean("dfs.replication.considerLoad", false);
dfs = new MiniDFSCluster(conf, 1, true, rack1, hosts1);
dfs.waitActive();
fileSys = dfs.getFileSystem();
if (!fileSys.mkdirs(inDir)) {
throw new IOException("Mkdirs failed to create " + inDir.toString());
}
Path file1 = new Path(dir1 + "/file1");
writeFile(conf, file1, (short)1, 1);
dfs.startDataNodes(conf, 1, true, null, rack2, hosts2, null);
dfs.waitActive();
// create file on two datanodes.
Path file2 = new Path(dir2 + "/file2");
writeFile(conf, file2, (short)2, 2);
// split it using a CombinedFile input format
DummyInputFormat inFormat = new DummyInputFormat();
Job job = new Job(conf);
FileInputFormat.setInputPaths(job, dir1 + "," + dir2);
inFormat.setMinSplitSizeRack(BLOCKSIZE);
List<InputSplit> splits = inFormat.getSplits(job);
System.out.println("Made splits(Test1): " + splits.size());
// make sure that each split has different locations
for (InputSplit split : splits) {
System.out.println("File split(Test1): " + split);
}
assertEquals(splits.size(), 2);
CombineFileSplit fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file2.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file2.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts2[0]); // should be on r2
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file1.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1
// create another file on 3 datanodes and 3 racks.
dfs.startDataNodes(conf, 1, true, null, rack3, hosts3, null);
dfs.waitActive();
Path file3 = new Path(dir3 + "/file3");
writeFile(conf, new Path(dir3 + "/file3"), (short)3, 3);
inFormat = new DummyInputFormat();
FileInputFormat.setInputPaths(job, dir1 + "," + dir2 + "," + dir3);
inFormat.setMinSplitSizeRack(BLOCKSIZE);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test2): " + split);
}
assertEquals(splits.size(), 3);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 3);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file3.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file3.getName());
assertEquals(fileSplit.getOffset(2), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts3[0]); // should be on r3
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file2.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file2.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts2[0]); // should be on r2
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file1.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1
// create file4 on all three racks
Path file4 = new Path(dir4 + "/file4");
writeFile(conf, file4, (short)3, 3);
inFormat = new DummyInputFormat();
FileInputFormat.setInputPaths(job, dir1 + "," + dir2 + "," + dir3 + "," + dir4);
inFormat.setMinSplitSizeRack(BLOCKSIZE);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test3): " + split);
}
assertEquals(splits.size(), 3);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 6);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file3.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file3.getName());
assertEquals(fileSplit.getOffset(2), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts3[0]); // should be on r3
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file2.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file2.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts2[0]); // should be on r2
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file1.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1
// maximum split size is 2 blocks
inFormat = new DummyInputFormat();
inFormat.setMinSplitSizeNode(BLOCKSIZE);
inFormat.setMaxSplitSize(2*BLOCKSIZE);
FileInputFormat.setInputPaths(job,
dir1 + "," + dir2 + "," + dir3 + "," + dir4);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test4): " + split);
}
assertEquals(splits.size(), 5);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file3.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file4.getName());
assertEquals(fileSplit.getOffset(1), 0);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file4.getName());
assertEquals(fileSplit.getOffset(0), BLOCKSIZE);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file4.getName());
assertEquals(fileSplit.getOffset(1), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
// maximum split size is 3 blocks
inFormat = new DummyInputFormat();
inFormat.setMinSplitSizeNode(BLOCKSIZE);
inFormat.setMaxSplitSize(3*BLOCKSIZE);
FileInputFormat.setInputPaths(job,
dir1 + "," + dir2 + "," + dir3 + "," + dir4);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test1): " + split);
}
assertEquals(splits.size(), 4);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 3);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file3.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file3.getName());
assertEquals(fileSplit.getOffset(2), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getPath(0).getName(), file4.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file4.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file4.getName());
assertEquals(fileSplit.getOffset(2), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file2.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file2.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host2.rack2.com");
fileSplit = (CombineFileSplit) splits.get(3);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file1.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host1.rack1.com");
// maximum split size is 4 blocks
inFormat = new DummyInputFormat();
inFormat.setMaxSplitSize(4*BLOCKSIZE);
FileInputFormat.setInputPaths(job, dir1 + "," + dir2 + "," + dir3 + "," + dir4);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test1): " + split);
}
assertEquals(splits.size(), 3);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 4);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file3.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file3.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file3.getName());
assertEquals(fileSplit.getOffset(2), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 4);
assertEquals(fileSplit.getPath(0).getName(), file2.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getPath(1).getName(), file2.getName());
assertEquals(fileSplit.getOffset(1), BLOCKSIZE);
assertEquals(fileSplit.getLength(1), BLOCKSIZE);
assertEquals(fileSplit.getPath(2).getName(), file4.getName());
assertEquals(fileSplit.getOffset(2), BLOCKSIZE);
assertEquals(fileSplit.getLength(2), BLOCKSIZE);
assertEquals(fileSplit.getPath(3).getName(), file4.getName());
assertEquals(fileSplit.getOffset(3), 2 * BLOCKSIZE);
assertEquals(fileSplit.getLength(3), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], "host2.rack2.com");
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getPath(0).getName(), file1.getName());
assertEquals(fileSplit.getOffset(0), 0);
assertEquals(fileSplit.getLength(0), BLOCKSIZE);
assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1
// maximum split size is 7 blocks and min is 3 blocks
inFormat = new DummyInputFormat();
inFormat.setMaxSplitSize(7*BLOCKSIZE);
inFormat.setMinSplitSizeNode(3*BLOCKSIZE);
inFormat.setMinSplitSizeRack(3*BLOCKSIZE);
FileInputFormat.setInputPaths(job,
dir1 + "," + dir2 + "," + dir3 + "," + dir4);
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test1): " + split);
}
assertEquals(splits.size(), 2);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 6);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getLocations()[0], "host3.rack3.com");
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 3);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getLocations()[0], "host1.rack1.com");
// Rack 1 has file1, file2 and file3 and file4
// Rack 2 has file2 and file3 and file4
// Rack 3 has file3 and file4
// setup a filter so that only file1 and file2 can be combined
inFormat = new DummyInputFormat();
FileInputFormat.addInputPath(job, inDir);
inFormat.setMinSplitSizeRack(1); // everything is at least rack local
inFormat.createPool(new TestFilter(dir1),
new TestFilter(dir2));
splits = inFormat.getSplits(job);
for (InputSplit split : splits) {
System.out.println("File split(Test1): " + split);
}
assertEquals(splits.size(), 3);
fileSplit = (CombineFileSplit) splits.get(0);
assertEquals(fileSplit.getNumPaths(), 2);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getLocations()[0], hosts2[0]); // should be on r2
fileSplit = (CombineFileSplit) splits.get(1);
assertEquals(fileSplit.getNumPaths(), 1);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getLocations()[0], hosts1[0]); // should be on r1
fileSplit = (CombineFileSplit) splits.get(2);
assertEquals(fileSplit.getNumPaths(), 6);
assertEquals(fileSplit.getLocations().length, 1);
assertEquals(fileSplit.getLocations()[0], hosts3[0]); // should be on r3
// measure performance when there are multiple pools and
// many files in each pool.
int numPools = 100;
int numFiles = 1000;
DummyInputFormat1 inFormat1 = new DummyInputFormat1();
for (int i = 0; i < numFiles; i++) {
FileInputFormat.setInputPaths(job, file1);
}
inFormat1.setMinSplitSizeRack(1); // everything is at least rack local
final Path dirNoMatch1 = new Path(inDir, "/dirxx");
final Path dirNoMatch2 = new Path(inDir, "/diryy");
for (int i = 0; i < numPools; i++) {
inFormat1.createPool(new TestFilter(dirNoMatch1),
new TestFilter(dirNoMatch2));
}
long start = System.currentTimeMillis();
splits = inFormat1.getSplits(job);
long end = System.currentTimeMillis();
System.out.println("Elapsed time for " + numPools + " pools " +
" and " + numFiles + " files is " +
((end - start)/1000) + " seconds.");
} finally {
if (dfs != null) {
dfs.shutdown();
}
}
}
static void writeFile(Configuration conf, Path name,
short replication, int numBlocks) throws IOException {
FileSystem fileSys = FileSystem.get(conf);
FSDataOutputStream stm = fileSys.create(name, true,
conf.getInt("io.file.buffer.size", 4096),
replication, (long)BLOCKSIZE);
for (int i = 0; i < numBlocks; i++) {
stm.write(databuf);
}
stm.close();
DFSTestUtil.waitReplication(fileSys, name, replication);
}
static class TestFilter implements PathFilter {
private Path p;
// store a path prefix in this TestFilter
public TestFilter(Path p) {
this.p = p;
}
// returns true if the specified path matches the prefix stored
// in this TestFilter.
public boolean accept(Path path) {
if (path.toString().indexOf(p.toString()) == 0) {
return true;
}
return false;
}
public String toString() {
return "PathFilter:" + p;
}
}
/*
* Prints out the input splits for the specified files
*/
private void splitRealFiles(String[] args) throws IOException {
Configuration conf = new Configuration();
Job job = new Job();
FileSystem fs = FileSystem.get(conf);
if (!(fs instanceof DistributedFileSystem)) {
throw new IOException("Wrong file system: " + fs.getClass().getName());
}
int blockSize = conf.getInt("dfs.block.size", 128 * 1024 * 1024);
DummyInputFormat inFormat = new DummyInputFormat();
for (int i = 0; i < args.length; i++) {
FileInputFormat.addInputPaths(job, args[i]);
}
inFormat.setMinSplitSizeRack(blockSize);
inFormat.setMaxSplitSize(10 * blockSize);
List<InputSplit> splits = inFormat.getSplits(job);
System.out.println("Total number of splits " + splits.size());
for (int i = 0; i < splits.size(); ++i) {
CombineFileSplit fileSplit = (CombineFileSplit) splits.get(i);
System.out.println("Split[" + i + "] " + fileSplit);
}
}
public static void main(String[] args) throws Exception{
// if there are some parameters specified, then use those paths
if (args.length != 0) {
TestCombineFileInputFormat test = new TestCombineFileInputFormat();
test.splitRealFiles(args);
} else {
TestCombineFileInputFormat test = new TestCombineFileInputFormat();
test.testSplitPlacement();
}
}
}