org.apache.hive.spark.client.SparkClientUtilities.java Source code

Introduction

Here is the source code for org.apache.hive.spark.client.SparkClientUtilities.java

Source

/**
 * 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.hive.spark.client;

import com.google.common.collect.Lists;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

public class SparkClientUtilities {
    protected static final transient Logger LOG = LoggerFactory.getLogger(SparkClientUtilities.class);

    private static final Map<String, Long> downloadedFiles = new ConcurrentHashMap<>();

    /**
     * Add new elements to the classpath.
     *
     * @param newPaths Map of classpath elements and corresponding timestamp
     * @return locally accessible files corresponding to the newPaths
     */
    public static List<String> addToClassPath(Map<String, Long> newPaths, Configuration conf, File localTmpDir)
            throws Exception {
        URLClassLoader loader = (URLClassLoader) Thread.currentThread().getContextClassLoader();
        List<URL> curPath = Lists.newArrayList(loader.getURLs());
        List<String> localNewPaths = new ArrayList<>();

        boolean newPathAdded = false;
        for (Map.Entry<String, Long> entry : newPaths.entrySet()) {
            URL newUrl = urlFromPathString(entry.getKey(), entry.getValue(), conf, localTmpDir);
            localNewPaths.add(newUrl.toString());
            if (newUrl != null && !curPath.contains(newUrl)) {
                curPath.add(newUrl);
                LOG.info("Added jar[" + newUrl + "] to classpath.");
                newPathAdded = true;
            }
        }

        if (newPathAdded) {
            URLClassLoader newLoader = new URLClassLoader(curPath.toArray(new URL[curPath.size()]), loader);
            Thread.currentThread().setContextClassLoader(newLoader);
        }
        return localNewPaths;
    }

    /**
     * Create a URL from a string representing a path to a local file.
     * The path string can be just a path, or can start with file:/, file:///
     * @param path  path string
     * @return
     */
    private static URL urlFromPathString(String path, Long timeStamp, Configuration conf, File localTmpDir) {
        URL url = null;
        try {
            if (StringUtils.indexOf(path, "file:/") == 0) {
                url = new URL(path);
            } else if (StringUtils.indexOf(path, "hdfs:/") == 0 || StringUtils.indexOf(path, "viewfs:/") == 0) {
                Path remoteFile = new Path(path);
                Path localFile = new Path(localTmpDir.getAbsolutePath() + File.separator + remoteFile.getName());
                Long currentTS = downloadedFiles.get(path);
                if (currentTS == null) {
                    currentTS = -1L;
                }
                if (!new File(localFile.toString()).exists() || currentTS < timeStamp) {
                    LOG.info("Copying " + remoteFile + " to " + localFile);
                    FileSystem remoteFS = remoteFile.getFileSystem(conf);
                    remoteFS.copyToLocalFile(remoteFile, localFile);
                    downloadedFiles.put(path, timeStamp);
                }
                return urlFromPathString(localFile.toString(), timeStamp, conf, localTmpDir);
            } else {
                url = new File(path).toURL();
            }
        } catch (Exception err) {
            LOG.error("Bad URL " + path + ", ignoring path", err);
        }
        return url;
    }

    public static boolean isYarnClusterMode(String master, String deployMode) {
        return "yarn-cluster".equals(master) || ("yarn".equals(master) && "cluster".equals(deployMode));
    }

    public static boolean isYarnClientMode(String master, String deployMode) {
        return "yarn-client".equals(master) || ("yarn".equals(master) && "client".equals(deployMode));
    }

    public static boolean isYarnMaster(String master) {
        return master != null && master.startsWith("yarn");
    }

    public static boolean isLocalMaster(String master) {
        return master != null && master.startsWith("local");
    }

    public static String getDeployModeFromMaster(String master) {
        if (master != null) {
            if (master.equals("yarn-client")) {
                return "client";
            } else if (master.equals("yarn-cluster")) {
                return "cluster";
            }
        }
        return null;
    }
}