/**
* 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.contrib.index.mapred;
import java.io.File;
import java.io.IOException;
import java.text.NumberFormat;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.contrib.index.example.HashingDistributionPolicy;
import org.apache.hadoop.contrib.index.example.RoundRobinDistributionPolicy;
import org.apache.hadoop.contrib.index.lucene.FileSystemDirectory;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.MiniMRCluster;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import junit.framework.TestCase;
public class TestDistributionPolicy extends TestCase {
private static final NumberFormat NUMBER_FORMAT = NumberFormat.getInstance();
static {
NUMBER_FORMAT.setMinimumIntegerDigits(5);
NUMBER_FORMAT.setGroupingUsed(false);
}
// however, "we only allow 0 or 1 reducer in local mode" - from
// LocalJobRunner
private Configuration conf;
private Path localInputPath = new Path(System.getProperty("build.test") + "/sample/data.txt");
private Path localUpdatePath =
new Path(System.getProperty("build.test") + "/sample/data2.txt");
private Path inputPath = new Path("/myexample/data.txt");
private Path updatePath = new Path("/myexample/data2.txt");
private Path outputPath = new Path("/myoutput");
private Path indexPath = new Path("/myindex");
private int numShards = 3;
private int numMapTasks = 5;
private int numDataNodes = 3;
private int numTaskTrackers = 3;
private int numDocsPerRun = 10; // num of docs in local input path
private FileSystem fs;
private MiniDFSCluster dfsCluster;
private MiniMRCluster mrCluster;
public TestDistributionPolicy() throws IOException {
super();
if (System.getProperty("hadoop.log.dir") == null) {
String base = new File(".").getPath(); // getAbsolutePath();
System.setProperty("hadoop.log.dir", new Path(base).toString() + "/logs");
}
conf = new Configuration();
}
protected void setUp() throws Exception {
super.setUp();
try {
dfsCluster =
new MiniDFSCluster(conf, numDataNodes, true, (String[]) null);
fs = dfsCluster.getFileSystem();
if (fs.exists(inputPath)) {
fs.delete(inputPath);
}
fs.copyFromLocalFile(localInputPath, inputPath);
if (fs.exists(updatePath)) {
fs.delete(updatePath);
}
fs.copyFromLocalFile(localUpdatePath, updatePath);
if (fs.exists(outputPath)) {
// do not create, mapred will create
fs.delete(outputPath);
}
if (fs.exists(indexPath)) {
fs.delete(indexPath);
}
mrCluster =
new MiniMRCluster(numTaskTrackers, fs.getUri().toString(), 1);
} catch (IOException e) {
if (dfsCluster != null) {
dfsCluster.shutdown();
dfsCluster = null;
}
if (fs != null) {
fs.close();
fs = null;
}
if (mrCluster != null) {
mrCluster.shutdown();
mrCluster = null;
}
throw e;
}
}
protected void tearDown() throws Exception {
if (dfsCluster != null) {
dfsCluster.shutdown();
dfsCluster = null;
}
if (fs != null) {
fs.close();
fs = null;
}
if (mrCluster != null) {
mrCluster.shutdown();
mrCluster = null;
}
super.tearDown();
}
public void testDistributionPolicy() throws IOException {
IndexUpdateConfiguration iconf = new IndexUpdateConfiguration(conf);
// test hashing distribution policy
iconf.setDistributionPolicyClass(HashingDistributionPolicy.class);
onetest();
if (fs.exists(indexPath)) {
fs.delete(indexPath);
}
// test round-robin distribution policy
iconf.setDistributionPolicyClass(RoundRobinDistributionPolicy.class);
onetest();
}
private void onetest() throws IOException {
long versionNumber = -1;
long generation = -1;
Shard[] shards = new Shard[numShards];
for (int j = 0; j < shards.length; j++) {
shards[j] =
new Shard(versionNumber,
new Path(indexPath, NUMBER_FORMAT.format(j)).toString(),
generation);
}
if (fs.exists(outputPath)) {
fs.delete(outputPath);
}
IIndexUpdater updater = new IndexUpdater();
updater.run(conf, new Path[] { inputPath }, outputPath, numMapTasks,
shards);
if (fs.exists(outputPath)) {
fs.delete(outputPath);
}
// delete docs w/ even docids, update docs w/ odd docids
updater.run(conf, new Path[] { updatePath }, outputPath, numMapTasks,
shards);
verify(shards);
}
private void verify(Shard[] shards) throws IOException {
// verify the index
IndexReader[] readers = new IndexReader[shards.length];
for (int i = 0; i < shards.length; i++) {
Directory dir =
new FileSystemDirectory(fs, new Path(shards[i].getDirectory()),
false, conf);
readers[i] = IndexReader.open(dir);
}
IndexReader reader = new MultiReader(readers);
IndexSearcher searcher = new IndexSearcher(reader);
Hits hits = searcher.search(new TermQuery(new Term("content", "apache")));
assertEquals(0, hits.length());
hits = searcher.search(new TermQuery(new Term("content", "hadoop")));
assertEquals(numDocsPerRun / 2, hits.length());
int[] counts = new int[numDocsPerRun];
for (int i = 0; i < hits.length(); i++) {
Document doc = hits.doc(i);
counts[Integer.parseInt(doc.get("id"))]++;
}
for (int i = 0; i < numDocsPerRun; i++) {
if (i % 2 == 0) {
assertEquals(0, counts[i]);
} else {
assertEquals(1, counts[i]);
}
}
searcher.close();
reader.close();
}
}