org.apache.tez.dag.utils.RelocalizationUtils.java Source code

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Here is the source code for org.apache.tez.dag.utils.RelocalizationUtils.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.tez.dag.utils;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.tez.common.ReflectionUtils;
import org.apache.tez.dag.api.TezException;

import com.google.common.collect.Lists;

@InterfaceAudience.Private
public class RelocalizationUtils {

    public static List<URL> processAdditionalResources(Map<String, URI> additionalResources, Configuration conf,
            String destDir) throws IOException, TezException {
        if (additionalResources == null || additionalResources.isEmpty()) {
            return Collections.emptyList();
        }

        List<URL> urls = Lists.newArrayListWithCapacity(additionalResources.size());

        for (Entry<String, URI> lrEntry : additionalResources.entrySet()) {
            Path dFile = downloadResource(lrEntry.getKey(), lrEntry.getValue(), conf, destDir);
            urls.add(dFile.toUri().toURL());
        }
        return urls;
    }

    public static void addUrlsToClassPath(List<URL> urls) {
        ReflectionUtils.addResourcesToSystemClassLoader(urls);
    }

    private static Path downloadResource(String destName, URI uri, Configuration conf, String destDir)
            throws IOException {
        FileSystem fs = FileSystem.get(uri, conf);
        Path cwd = new Path(destDir);
        Path dFile = new Path(cwd, destName);
        Path srcPath = new Path(uri);
        fs.copyToLocalFile(srcPath, dFile);
        return dFile.makeQualified(FileSystem.getLocal(conf).getUri(), cwd);
    }

    public static byte[] getLocalSha(Path path, Configuration conf) throws IOException {
        InputStream is = null;
        try {
            is = FileSystem.getLocal(conf).open(path);
            return DigestUtils.sha256(is);
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }

    public static byte[] getResourceSha(URI uri, Configuration conf) throws IOException {
        InputStream is = null;
        try {
            is = FileSystem.get(uri, conf).open(new Path(uri));
            return DigestUtils.sha256(is);
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }
}