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TEZ-3848. Tez Local mode doesn't localize distributed cache files (Ja…
…cob Tolar via jeagles)
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Jonathan Eagles
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Oct 4, 2017
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tez-dag/src/main/java/org/apache/tez/dag/app/launcher/TezLocalCacheManager.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 | ||
| * <p> | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * <p> | ||
| * 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.app.launcher; | ||
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| import com.google.common.util.concurrent.ThreadFactoryBuilder; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.fs.FileContext; | ||
| import org.apache.hadoop.fs.Path; | ||
| import org.apache.hadoop.security.UserGroupInformation; | ||
| import org.apache.hadoop.yarn.api.records.LocalResource; | ||
| import org.apache.hadoop.yarn.api.records.LocalResourceType; | ||
| import org.apache.hadoop.yarn.util.FSDownload; | ||
|
|
||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Paths; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
| import java.util.concurrent.Future; | ||
| import java.util.concurrent.ThreadFactory; | ||
|
|
||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| /** | ||
| * This class is responsible for localizing files from the distributed cache for Tez local mode. | ||
| */ | ||
| public class TezLocalCacheManager { | ||
|
|
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| private static final Logger LOG = LoggerFactory.getLogger(TezLocalCacheManager.class); | ||
|
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| final private Map<String, LocalResource> resources; | ||
| final private Configuration conf; | ||
| final private UserGroupInformation ugi; | ||
| final private FileContext fileContext; | ||
| final private java.nio.file.Path tempDir; | ||
|
|
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| final private Map<LocalResource, ResourceInfo> resourceInfo = new HashMap<>(); | ||
|
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| public TezLocalCacheManager(Map<String, LocalResource> resources, Configuration conf) throws IOException { | ||
| this.ugi = UserGroupInformation.getCurrentUser(); | ||
| this.fileContext = FileContext.getLocalFSFileContext(); | ||
| this.resources = resources; | ||
| this.conf = conf; | ||
| this.tempDir = Files.createTempDirectory(Paths.get("."), "tez-local-cache"); | ||
| } | ||
|
|
||
| /** | ||
| * Localize this instance's resources by downloading and symlinking them. | ||
| * | ||
| * @throws IOException when an error occurs in download or link | ||
| */ | ||
| public void localize() throws IOException { | ||
| String absPath = Paths.get(".").toAbsolutePath().normalize().toString(); | ||
| Path cwd = fileContext.makeQualified(new Path(absPath)); | ||
| ExecutorService threadPool = null; | ||
|
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| try { | ||
| // construct new threads with helpful names | ||
| ThreadFactory threadFactory = new ThreadFactoryBuilder() | ||
| .setNameFormat("TezLocalCacheManager Downloader #%d") | ||
| .build(); | ||
| threadPool = Executors.newCachedThreadPool(threadFactory); | ||
|
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| // start all fetches | ||
| for (Map.Entry<String, LocalResource> entry : resources.entrySet()) { | ||
| String resourceName = entry.getKey(); | ||
| LocalResource resource = entry.getValue(); | ||
|
|
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| if (resource.getType() == LocalResourceType.PATTERN) { | ||
| throw new IllegalArgumentException("Resource type PATTERN not supported."); | ||
| } | ||
|
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| // submit task to download the object | ||
| java.nio.file.Path downloadDir = Files.createTempDirectory(tempDir, resourceName); | ||
| Path dest = new Path(downloadDir.toAbsolutePath().toString()); | ||
| FSDownload downloader = new FSDownload(fileContext, ugi, conf, dest, resource); | ||
| Future<Path> downloadedPath = threadPool.submit(downloader); | ||
|
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| // linkPath is the path we want to symlink the file/directory into | ||
| Path linkPath = new Path(cwd, entry.getKey()); | ||
| resourceInfo.put(resource, new ResourceInfo(downloadedPath, linkPath)); | ||
| } | ||
|
|
||
| // Link each file | ||
| for (Map.Entry<LocalResource, ResourceInfo> entry : resourceInfo.entrySet()) { | ||
| LocalResource resource = entry.getKey(); | ||
| ResourceInfo resourceMeta = entry.getValue(); | ||
|
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| Path linkPath = resourceMeta.linkPath; | ||
| Path targetPath; | ||
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| try { | ||
| // this blocks on the download completing | ||
| targetPath = resourceMeta.downloadPath.get(); | ||
| } catch (InterruptedException | ExecutionException e) { | ||
| throw new IOException(e); | ||
| } | ||
|
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| if (createSymlink(targetPath, linkPath)) { | ||
| LOG.info("Localized file: {} as {}", resource, linkPath); | ||
| } else { | ||
| LOG.warn("Failed to create symlink: {} <- {}", targetPath, linkPath); | ||
| } | ||
| } | ||
| } finally { | ||
| if (threadPool != null) { | ||
| threadPool.shutdownNow(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Clean up any symlinks and temp files that were created. | ||
| * | ||
| * @throws IOException when an error occurs in cleanup | ||
| */ | ||
| public void cleanup() throws IOException { | ||
| for (ResourceInfo info : resourceInfo.values()) { | ||
| if (fileContext.util().exists(info.linkPath)) { | ||
| fileContext.delete(info.linkPath, true); | ||
| } | ||
| } | ||
|
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| Path temp = new Path(tempDir.toString()); | ||
| if (fileContext.util().exists(temp)) { | ||
| fileContext.delete(temp, true); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Create a symlink. | ||
| */ | ||
| private boolean createSymlink(Path target, Path link) throws IOException { | ||
| LOG.info("Creating symlink: {} <- {}", target, link); | ||
| String targetPath = target.toUri().getPath(); | ||
| String linkPath = link.toUri().getPath(); | ||
|
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| if (fileContext.util().exists(link)) { | ||
| LOG.warn("File already exists at symlink path: {}", link); | ||
| return false; | ||
| } else { | ||
| try { | ||
| Files.createSymbolicLink(Paths.get(linkPath), Paths.get(targetPath)); | ||
| return true; | ||
| } catch (UnsupportedOperationException e) { | ||
| LOG.warn("Unable to create symlink {} <- {}: UnsupportedOperationException", target, link); | ||
| return false; | ||
| } | ||
| } | ||
| } | ||
|
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| /** | ||
| * Wrapper to keep track of download path and link path | ||
| */ | ||
| private static class ResourceInfo { | ||
| final Future<Path> downloadPath; | ||
| final Path linkPath; | ||
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| public ResourceInfo(Future<Path> downloadPath, Path linkPath) { | ||
| this.downloadPath = downloadPath; | ||
| this.linkPath = linkPath; | ||
| } | ||
| } | ||
| } |