org.apache.blur.utils.TableShardCountCollapserTest.java Source code

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Here is the source code for org.apache.blur.utils.TableShardCountCollapserTest.java

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package org.apache.blur.utils;

/**
 * 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.
 */
import static org.junit.Assert.assertEquals;

import java.io.IOException;

import org.apache.blur.store.buffer.BufferStore;
import org.apache.blur.store.hdfs.HdfsDirectory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.mapreduce.Partitioner;
import org.apache.hadoop.mapreduce.lib.partition.HashPartitioner;
import org.apache.lucene.analysis.core.KeywordAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.IntField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexableField;
import org.apache.lucene.index.TieredMergePolicy;
import org.apache.lucene.util.Version;
import org.junit.Before;
import org.junit.Test;

public class TableShardCountCollapserTest {

    private static final int NUMBER_OF_BASE_SHARDS = 128;
    private Configuration configuration;
    private Path path;

    @Before
    public void setup() throws IOException {
        BufferStore.initNewBuffer(128, 128 * 128);
        configuration = new Configuration();
        path = new Path("./target/tmp-shards-for-testing");
        FileSystem fileSystem = path.getFileSystem(configuration);
        fileSystem.delete(path, true);
        createShards(NUMBER_OF_BASE_SHARDS);
    }

    private void createShards(int shardCount) throws IOException {
        for (int i = 0; i < shardCount; i++) {
            String shardName = ShardUtil.getShardName(i);
            createShard(configuration, i, new Path(path, shardName), shardCount);
        }
    }

    @Test
    public void testShardCountReducer() throws IOException {
        assertData(NUMBER_OF_BASE_SHARDS);
        TableShardCountCollapser t = new TableShardCountCollapser();
        t.setConf(configuration);
        t.setTablePath(path);
        int totalShardCount = 4;
        t.collapseShardsTo(totalShardCount);
        assertData(totalShardCount);
    }

    private void assertData(int totalShardCount) throws IOException {
        Partitioner<IntWritable, IntWritable> partitioner = new HashPartitioner<IntWritable, IntWritable>();
        for (int i = 0; i < totalShardCount; i++) {
            HdfsDirectory directory = new HdfsDirectory(configuration, new Path(path, ShardUtil.getShardName(i)));
            DirectoryReader reader = DirectoryReader.open(directory);
            int numDocs = reader.numDocs();
            for (int d = 0; d < numDocs; d++) {
                Document document = reader.document(d);
                IndexableField field = document.getField("id");
                Integer id = (Integer) field.numericValue();
                int partition = partitioner.getPartition(new IntWritable(id), null, totalShardCount);
                assertEquals(i, partition);
            }
            reader.close();
        }
    }

    private static void createShard(Configuration configuration, int i, Path path, int totalShardCount)
            throws IOException {
        HdfsDirectory hdfsDirectory = new HdfsDirectory(configuration, path);
        IndexWriterConfig conf = new IndexWriterConfig(Version.LUCENE_43, new KeywordAnalyzer());
        TieredMergePolicy mergePolicy = (TieredMergePolicy) conf.getMergePolicy();
        mergePolicy.setUseCompoundFile(false);
        IndexWriter indexWriter = new IndexWriter(hdfsDirectory, conf);

        Partitioner<IntWritable, IntWritable> partitioner = new HashPartitioner<IntWritable, IntWritable>();
        int partition = partitioner.getPartition(new IntWritable(i), null, totalShardCount);
        assertEquals(i, partition);

        Document doc = getDoc(i);
        indexWriter.addDocument(doc);
        indexWriter.close();
    }

    private static Document getDoc(int i) {
        Document document = new Document();
        document.add(new IntField("id", i, Store.YES));
        return document;
    }

}