/*
Copyright 2011 m6d.com
Licensed 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 com.m6d.filecrush.crush;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;
import java.io.IOException;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.SequenceFile.Writer;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import com.m6d.filecrush.crush.CrushPartitioner;
@SuppressWarnings("deprecation")
public class CrushPartitionerTest {
@Rule
public final TemporaryFolder tmp = new TemporaryFolder();
private JobConf job;
private FileSystem fs;
private Path partitionMap;
private CrushPartitioner partitioner;
@Before
public void setupPartitionMap() throws IOException {
job = new JobConf(false);
job.set("fs.default.name", "file:///");
job.set("fs.file.impl", "org.apache.hadoop.fs.LocalFileSystem");
job.set("crush.partition.map", tmp.getRoot().getAbsolutePath() + "/partition-map");
fs = FileSystem.get(job);
partitionMap = new Path(tmp.getRoot().getAbsolutePath(), "partition-map");
partitioner = new CrushPartitioner();
}
@Test
public void partition() throws IOException {
Writer writer = SequenceFile.createWriter(fs, job, partitionMap, Text.class, IntWritable.class);
Text key = new Text();
IntWritable partNum = new IntWritable();
key.set("bucket-1");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-2");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-3");
partNum.set(1);
writer.append(key, partNum);
key.set("bucket-4");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-5");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-6");
partNum.set(2);
writer.append(key, partNum);
writer.close();
job.setNumReduceTasks(3);
partitioner.configure(job);
Text fileName = new Text();
key.set("bucket-1");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(0));
}
key.set("bucket-2");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(0));
}
key.set("bucket-3");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(1));
}
key.set("bucket-4");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
key.set("bucket-5");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
key.set("bucket-6");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
}
@Test
public void partitionWithFewerPartitionsThanReduceTasks() throws IOException {
Writer writer = SequenceFile.createWriter(fs, job, partitionMap, Text.class, IntWritable.class);
Text key = new Text();
IntWritable partNum = new IntWritable();
key.set("bucket-1");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-2");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-3");
partNum.set(1);
writer.append(key, partNum);
key.set("bucket-4");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-5");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-6");
partNum.set(2);
writer.append(key, partNum);
writer.close();
job.setNumReduceTasks(40);
partitioner.configure(job);
Text fileName = new Text();
key.set("bucket-1");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(0));
}
key.set("bucket-2");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(0));
}
key.set("bucket-3");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(1));
}
key.set("bucket-4");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
key.set("bucket-5");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
key.set("bucket-6");
for (int file = 0; file < 4; file++) {
fileName.set("file" + file);
assertThat(partitioner.getPartition(key, fileName, 3), equalTo(2));
}
}
@Test
public void noDupes() throws IOException {
Writer writer = SequenceFile.createWriter(fs, job, partitionMap, Text.class, IntWritable.class);
Text key = new Text();
IntWritable value = new IntWritable();
key.set("bucket-1");
value.set(0);
writer.append(key, value);
key.set("bucket-2");
value.set(0);
writer.append(key, value);
key.set("bucket-2");
value.set(1);
writer.append(key, value);
writer.close();
job.setNumReduceTasks(3);
try {
partitioner.configure(job);
fail();
} catch (IllegalArgumentException e) {
if (!e.getMessage().contains("bucket-2")) {
throw e;
}
}
}
@Test
public void partitionTooLow() throws IOException {
Writer writer = SequenceFile.createWriter(fs, job, partitionMap, Text.class, IntWritable.class);
Text key = new Text();
IntWritable partNum = new IntWritable();
key.set("bucket-1");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-2");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-4");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-5");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-6");
partNum.set(-1);
writer.append(key, partNum);
writer.close();
job.setNumReduceTasks(3);
try {
partitioner.configure(job);
fail("No such thing as a negitave partition");
} catch (IllegalArgumentException e) {
if (!e.getMessage().contains("Partition -1")) {
throw e;
}
}
}
@Test
public void partitionTooHigh() throws IOException {
Writer writer = SequenceFile.createWriter(fs, job, partitionMap, Text.class, IntWritable.class);
Text key = new Text();
IntWritable partNum = new IntWritable();
key.set("bucket-1");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-2");
partNum.set(0);
writer.append(key, partNum);
key.set("bucket-4");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-5");
partNum.set(2);
writer.append(key, partNum);
key.set("bucket-6");
partNum.set(3);
writer.append(key, partNum);
writer.close();
job.setNumReduceTasks(3);
try {
partitioner.configure(job);
fail("Parition with id 3 is not allowed with 3 reduce tasks");
} catch (IllegalArgumentException e) {
if (!e.getMessage().contains("Partition 3")) {
throw e;
}
}
}
}