org.apache.mahout.text.LuceneSegmentRecordReaderTest.java Source code

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Here is the source code for org.apache.mahout.text.LuceneSegmentRecordReaderTest.java

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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.mahout.text;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.lucene.index.*;
import org.apache.mahout.common.HadoopUtil;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

import static java.util.Arrays.asList;
import static org.apache.mahout.text.doc.SingleFieldDocument.*;

public class LuceneSegmentRecordReaderTest extends AbstractLuceneStorageTest {
    private Configuration configuration;

    private LuceneSegmentRecordReader recordReader;

    private SegmentInfos segmentInfos;

    @Before
    public void before() throws IOException, InterruptedException {
        LuceneStorageConfiguration lucene2SeqConf = new LuceneStorageConfiguration(getConfiguration(),
                asList(getIndexPath1()), new Path("output"), ID_FIELD, asList(FIELD));
        configuration = lucene2SeqConf.serialize();
        recordReader = new LuceneSegmentRecordReader();
        commitDocuments(getDirectory(getIndexPath1AsFile()), docs.subList(0, 500));
        commitDocuments(getDirectory(getIndexPath1AsFile()), docs.subList(500, 1000));
        segmentInfos = new SegmentInfos();
        segmentInfos.read(getDirectory(getIndexPath1AsFile()));
    }

    @After
    public void after() throws IOException {
        HadoopUtil.delete(configuration, getIndexPath1());
    }

    @Test
    public void testKey() throws Exception {
        for (SegmentCommitInfo segmentInfo : segmentInfos) {
            int docId = 0;
            LuceneSegmentInputSplit inputSplit = new LuceneSegmentInputSplit(getIndexPath1(), segmentInfo.info.name,
                    segmentInfo.sizeInBytes());
            TaskAttemptContext context = getTaskAttemptContext(configuration, new TaskAttemptID());
            recordReader.initialize(inputSplit, context);
            for (int i = 0; i < 500; i++) {
                recordReader.nextKeyValue();
                //we can't be sure of the order we are getting the segments, so we have to fudge here a bit on the id, but it is either id: i or i + 500
                assertTrue("i = " + i + " docId= " + docId,
                        String.valueOf(docId).equals(recordReader.getCurrentKey().toString())
                                || String.valueOf(docId + 500).equals(recordReader.getCurrentKey().toString()));
                assertEquals(NullWritable.get(), recordReader.getCurrentValue());
                docId++;
            }
        }
    }

    @Test(expected = IllegalArgumentException.class)
    public void testNonExistingIdField() throws Exception {
        configuration = new LuceneStorageConfiguration(getConfiguration(), asList(getIndexPath1()),
                new Path("output"), "nonExistingId", asList(FIELD)).serialize();
        SegmentCommitInfo segmentInfo = segmentInfos.iterator().next();
        LuceneSegmentInputSplit inputSplit = new LuceneSegmentInputSplit(getIndexPath1(), segmentInfo.info.name,
                segmentInfo.sizeInBytes());
        TaskAttemptContext context = getTaskAttemptContext(configuration, new TaskAttemptID());
        recordReader.initialize(inputSplit, context);
    }

    @Test(expected = IllegalArgumentException.class)
    public void testNonExistingField() throws Exception {
        configuration = new LuceneStorageConfiguration(getConfiguration(), asList(getIndexPath1()),
                new Path("output"), ID_FIELD, asList("nonExistingField")).serialize();
        SegmentCommitInfo segmentInfo = segmentInfos.iterator().next();
        LuceneSegmentInputSplit inputSplit = new LuceneSegmentInputSplit(getIndexPath1(), segmentInfo.info.name,
                segmentInfo.sizeInBytes());
        TaskAttemptContext context = getTaskAttemptContext(configuration, new TaskAttemptID());
        recordReader.initialize(inputSplit, context);
    }

    // Use reflection to abstract this incompatibility between Hadoop 1 & 2 APIs.
    private TaskAttemptContext getTaskAttemptContext(Configuration conf, TaskAttemptID jobID)
            throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException,
            InstantiationException {
        Class<? extends TaskAttemptContext> clazz;
        if (!TaskAttemptContext.class.isInterface()) {
            clazz = TaskAttemptContext.class;
        } else {
            clazz = (Class<? extends TaskAttemptContext>) Class
                    .forName("org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl");
        }
        return clazz.getConstructor(Configuration.class, TaskAttemptID.class).newInstance(conf, jobID);
    }
}