io.hops.erasure_coding.TestMapReduceEncodingManager.java Source code

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Here is the source code for io.hops.erasure_coding.TestMapReduceEncodingManager.java

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/*
 * Copyright (C) 2015 hops.io.
 *
 * 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 io.hops.erasure_coding;

import io.hops.metadata.hdfs.entity.EncodingPolicy;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.BlockMissingException;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.junit.Test;

import java.io.IOException;

import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_KEY;

public class TestMapReduceEncodingManager extends ClusterTest {

    public static final Log LOG = LogFactory.getLog(TestLocalEncodingManagerImpl.class);

    private static final int TEST_BLOCK_COUNT = 10;

    private HdfsConfiguration conf;
    private final long seed = 0xDEADBEEFL;
    private final Path testFile = new Path("/test_file");
    private final Path parityFile = new Path("/parity/test_file");

    public TestMapReduceEncodingManager() {
        conf = new HdfsConfiguration();
        conf.setLong(DFS_BLOCK_SIZE_KEY, DFS_TEST_BLOCK_SIZE);
        conf.setInt(DFS_REPLICATION_KEY, 1);
        conf.set(DFSConfigKeys.ERASURE_CODING_CODECS_KEY, Util.JSON_CODEC_ARRAY);
        numDatanode = 16;
    }

    @Override
    protected Configuration getConfig() {
        return conf;
    }

    @Test
    public void testRaidFiles() throws IOException {
        DistributedFileSystem dfs = (DistributedFileSystem) getFileSystem();
        MapReduceEncodingManager encodingManager = new MapReduceEncodingManager(conf);

        Util.createRandomFile(dfs, testFile, seed, TEST_BLOCK_COUNT, DFS_TEST_BLOCK_SIZE);
        FileStatus testFileStatus = dfs.getFileStatus(testFile);
        Codec.initializeCodecs(conf);
        EncodingPolicy policy = new EncodingPolicy("src", (short) 1);
        encodingManager.encodeFile(policy, testFile, parityFile);

        // Busy waiting until the encoding is done
        while (encodingManager.computeReports().size() > 0) {
            ;
        }
        FileStatus parityStatus = dfs.getFileStatus(parityFile);
        assertEquals(parityStatus.getLen(), 6 * DFS_TEST_BLOCK_SIZE);
        try {
            FSDataInputStream in = dfs.open(parityFile);
            byte[] buff = new byte[6 * DFS_TEST_BLOCK_SIZE];
            in.readFully(0, buff);
        } catch (BlockMissingException e) {
            LOG.error("Reading parity failed", e);
            fail("Parity could not be read.");
        }
    }
}