cameronlee314 commented on a change in pull request #1173: SAMZA-2333: [AM isolation] Use cytodynamics classloader to launch job coordinator URL: https://github.com/apache/samza/pull/1173#discussion_r333262292
########## File path: samza-core/src/main/java/org/apache/samza/classloader/IsolatingClassLoaderFactory.java ########## @@ -0,0 +1,195 @@ +/* + * 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.samza.classloader; + +import com.google.common.collect.ImmutableSet; +import com.linkedin.cytodynamics.matcher.BootstrapClassPredicate; +import com.linkedin.cytodynamics.matcher.GlobMatcher; +import com.linkedin.cytodynamics.nucleus.DelegateRelationship; +import com.linkedin.cytodynamics.nucleus.DelegateRelationshipBuilder; +import com.linkedin.cytodynamics.nucleus.IsolationLevel; +import com.linkedin.cytodynamics.nucleus.LoaderBuilder; +import com.linkedin.cytodynamics.nucleus.OriginRestriction; +import java.io.File; +import java.io.IOException; +import java.net.MalformedURLException; +import java.net.URI; +import java.net.URISyntaxException; +import java.net.URL; +import java.net.URLClassLoader; +import java.nio.charset.StandardCharsets; +import java.nio.file.Files; +import java.nio.file.Paths; +import java.util.List; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.stream.Stream; +import com.google.common.annotations.VisibleForTesting; +import org.apache.samza.SamzaException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * Use this to build an isolating classloader for running Samza. + */ +public class IsolatingClassLoaderFactory { + private static final Logger LOG = LoggerFactory.getLogger(IsolatingClassLoaderFactory.class); + + public ClassLoader buildClassLoader() { + String baseDirectoryPath = System.getProperty("user.dir"); + File apiLibDirectory = + libDirectory(new File(baseDirectoryPath, IsolationUtils.APPLICATION_MASTER_API_DIRECTORY)); + LOG.info("Using API lib directory: {}", apiLibDirectory); + File infrastructureLibDirectory = + libDirectory(new File(baseDirectoryPath, IsolationUtils.APPLICATION_MASTER_INFRASTRUCTURE_DIRECTORY)); + LOG.info("Using infrastructure lib directory: {}", infrastructureLibDirectory); + File applicationLibDirectory = + libDirectory(new File(baseDirectoryPath, IsolationUtils.APPLICATION_MASTER_APPLICATION_DIRECTORY)); + LOG.info("Using application lib directory: {}", applicationLibDirectory); + + ClassLoader apiClassLoader = buildApiClassLoader(apiLibDirectory); + ClassLoader applicationClassLoader = + buildApplicationClassLoader(applicationLibDirectory, apiLibDirectory, apiClassLoader); + + // the classloader to ultimately return is the one with the infrastructure classpath + return buildInfrastructureClassLoader(infrastructureLibDirectory, apiLibDirectory, apiClassLoader, + applicationClassLoader); + } + + private static ClassLoader buildApiClassLoader(File apiLibDirectory) { + // null parent means to use bootstrap classloader as the parent + return new URLClassLoader(getClasspathAsURLs(apiLibDirectory), null); + } + + private static ClassLoader buildApplicationClassLoader(File applicationLibDirectory, File apiLibDirectory, + ClassLoader apiClassLoader) { + return LoaderBuilder.anIsolatingLoader() + // look in application directory for JARs + .withClasspath(getClasspathAsURIs(applicationLibDirectory)) + // getClasspathAsURIs should already satisfy this, but doing it to be safe + .withOriginRestriction(OriginRestriction.denyByDefault().allowingDirectory(applicationLibDirectory, false)) + .withParentRelationship(buildApiParentRelationship(apiLibDirectory, apiClassLoader)) + .build(); + } + + private static ClassLoader buildInfrastructureClassLoader(File infrastructureLibDirectory, File apiLibDirectory, + ClassLoader apiClassLoader, ClassLoader applicationClassLoader) { + return LoaderBuilder.anIsolatingLoader() + // look in application directory for JARs + .withClasspath(getClasspathAsURIs(infrastructureLibDirectory)) + // getClasspathAsURIs should already satisfy this, but doing it to be safe + .withOriginRestriction(OriginRestriction.denyByDefault().allowingDirectory(infrastructureLibDirectory, false)) + .withParentRelationship(buildApiParentRelationship(apiLibDirectory, apiClassLoader)) + // need to be able to fall back to application for loading certain classes Review comment: Examples would be application-specified pluggable Samza classes and message schemas. 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