com.cloudera.data.filesystem.TestFileSystemDatasetRepository.java Source code

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Here is the source code for com.cloudera.data.filesystem.TestFileSystemDatasetRepository.java

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/**
 * Copyright 2013 Cloudera Inc.
 *
 * 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.cloudera.data.filesystem;

import com.cloudera.data.Dataset;
import com.cloudera.data.DatasetDescriptor;
import com.cloudera.data.DatasetReader;
import com.cloudera.data.PartitionStrategy;
import com.google.common.collect.Lists;
import com.google.common.io.Files;
import java.io.IOException;
import org.apache.avro.Schema;
import org.apache.avro.Schema.Field;
import org.apache.avro.Schema.Type;
import org.apache.avro.generic.GenericData.Record;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class TestFileSystemDatasetRepository {

    private FileSystem fileSystem;
    private Path testDirectory;
    private FileSystemDatasetRepository repo;
    private Schema testSchema;

    @Before
    public void setUp() throws IOException {
        Configuration conf = new Configuration();

        conf.set("fs.default.name", "file:///");

        fileSystem = FileSystem.get(conf);
        testDirectory = new Path(Files.createTempDir().getAbsolutePath());
        repo = new FileSystemDatasetRepository(fileSystem, testDirectory);

        testSchema = Schema.createRecord("Test", "Test record schema", "com.cloudera.data.filesystem", false);
        testSchema.setFields(Lists.newArrayList(new Field("name", Schema.create(Type.STRING), null, null)));
    }

    @After
    public void tearDown() throws IOException {
        fileSystem.delete(testDirectory, true);
    }

    @Test
    public void testCreate() throws IOException {
        Dataset dataset = repo.create("test1", new DatasetDescriptor.Builder().schema(testSchema).get());

        Assert.assertEquals("Dataset name is propagated", "test1", dataset.getName());
        Assert.assertEquals("Dataset schema is propagated", testSchema, dataset.getDescriptor().getSchema());
        Assert.assertTrue("Dataset data directory exists", fileSystem.exists(new Path(testDirectory, "test1/")));
        Assert.assertTrue("Dataset properties file exists",
                fileSystem.exists(new Path(testDirectory, "test1/.metadata/descriptor.properties")));
        Assert.assertTrue("Dataset schema file exists",
                fileSystem.exists(new Path(testDirectory, "test1/.metadata/schema.avsc")));
    }

    @Test
    public void testCreatePartitioned() throws IOException {
        DatasetDescriptor descriptor = new DatasetDescriptor.Builder().schema(testSchema)
                .partitionStrategy(new PartitionStrategy.Builder().hash("name", 3).get()).get();

        Dataset dataset = repo.create("test2", descriptor);

        Assert.assertEquals("Dataset name is propagated", "test2", dataset.getName());
        Assert.assertEquals("Dataset schema is propagated", testSchema, dataset.getDescriptor().getSchema());
        Assert.assertTrue("Dataset data directory exists", fileSystem.exists(new Path(testDirectory, "test2/")));
        Assert.assertTrue("Dataset properties file exists",
                fileSystem.exists(new Path(testDirectory, "test2/.metadata/descriptor.properties")));
        Assert.assertTrue("Dataset schema file exists",
                fileSystem.exists(new Path(testDirectory, "test2/.metadata/schema.avsc")));
    }

    @Test
    public void testLoad() throws IOException {
        // Just invoke the creation test so we have a dataset to test with.
        testCreate();

        Dataset dataset = repo.get("test1");

        Assert.assertNotNull("Dataset is loaded and produced", dataset);
        Assert.assertEquals("Dataset name is propagated", "test1", dataset.getName());
        Assert.assertEquals("Dataset schema is loaded", testSchema, dataset.getDescriptor().getSchema());

        /*
         * We perform a read test to make sure only data files are encountered
         * during a read.
         */
        DatasetReader<Record> reader = dataset.getReader();
        int records = 0;

        try {
            reader.open();

            while (reader.hasNext()) {
                Record record = reader.read();
                Assert.assertNotNull(record);
                records++;
            }
        } finally {
            reader.close();
        }

        Assert.assertEquals(0, records);
    }

    @Test
    public void testDrop() throws IOException {
        // Just invoke the creation test so we have a dataset to test with.
        testCreate();

        boolean result = repo.drop("test1");
        Assert.assertTrue("Drop dataset should return true", result);

        result = repo.drop("test1");
        Assert.assertFalse("Drop nonexistant dataset should return false", result);
    }

}