| /* |
| * 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.flink.api.java; |
| |
| import org.apache.flink.annotation.Public; |
| import org.apache.flink.annotation.PublicEvolving; |
| import org.apache.flink.api.common.ExecutionConfig; |
| import org.apache.flink.api.common.InvalidProgramException; |
| import org.apache.flink.api.common.JobExecutionResult; |
| import org.apache.flink.api.common.JobID; |
| import org.apache.flink.api.common.JobSubmissionResult; |
| import org.apache.flink.api.common.Plan; |
| import org.apache.flink.api.common.PlanExecutor; |
| import org.apache.flink.configuration.Configuration; |
| |
| /** |
| * An {@link ExecutionEnvironment} that runs the program locally, multi-threaded, in the JVM where the |
| * environment is instantiated. |
| * |
| * <p>When this environment is instantiated, it uses a default parallelism of {@code 1}. The default |
| * parallelism can be set via {@link #setParallelism(int)}. |
| * |
| * <p>Local environments can also be instantiated through {@link ExecutionEnvironment#createLocalEnvironment()} |
| * and {@link ExecutionEnvironment#createLocalEnvironment(int)}. The former version will pick a |
| * default parallelism equal to the number of hardware contexts in the local machine. |
| */ |
| @Public |
| public class LocalEnvironment extends ExecutionEnvironment { |
| |
| /** The user-defined configuration for the local execution. */ |
| private final Configuration configuration; |
| |
| /** Create lazily upon first use. */ |
| private PlanExecutor executor; |
| |
| /** In case we keep the executor alive for sessions, this reaper shuts it down eventually. |
| * The reaper's finalize method triggers the executor shutdown. */ |
| @SuppressWarnings("all") |
| private ExecutorReaper executorReaper; |
| |
| /** |
| * Creates a new local environment. |
| */ |
| public LocalEnvironment() { |
| this(new Configuration()); |
| } |
| |
| /** |
| * Creates a new local environment that configures its local executor with the given configuration. |
| * |
| * @param config The configuration used to configure the local executor. |
| */ |
| public LocalEnvironment(Configuration config) { |
| if (!ExecutionEnvironment.areExplicitEnvironmentsAllowed()) { |
| throw new InvalidProgramException( |
| "The LocalEnvironment cannot be instantiated when running in a pre-defined context " + |
| "(such as Command Line Client, Scala Shell, or TestEnvironment)"); |
| } |
| this.configuration = config == null ? new Configuration() : config; |
| try { |
| startNewSession(); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public JobSubmissionResult executeInternal(String jobName, boolean detached) throws Exception { |
| if (executor == null) { |
| startNewSession(); |
| } |
| |
| Plan p = createProgramPlan(jobName); |
| // Session management is disabled, revert this commit to enable |
| p.setJobId(jobID); |
| p.setSessionTimeout(sessionTimeout); |
| |
| JobSubmissionResult result = executor.executePlan(p, detached); |
| if (result.isJobExecutionResult()) { |
| this.lastJobExecutionResult = (JobExecutionResult) result; |
| } |
| return result; |
| } |
| |
| @Override |
| public void cancel(JobID jobId) throws Exception { |
| if (executor != null) { |
| this.executor.cancelPlan(jobId); |
| } else { |
| System.out.println("executor is null"); |
| } |
| } |
| |
| @Override |
| public void stop() throws Exception { |
| if (executor != null) { |
| executor.stop(); |
| } |
| } |
| |
| @Override |
| public String getExecutionPlan() throws Exception { |
| Plan p = createProgramPlan(null, false); |
| |
| // make sure that we do not start an executor in any case here. |
| // if one runs, fine, of not, we only create the class but disregard immediately afterwards |
| if (executor != null) { |
| return executor.getOptimizerPlanAsJSON(p); |
| } |
| else { |
| PlanExecutor tempExecutor = PlanExecutor.createLocalExecutor(configuration); |
| return tempExecutor.getOptimizerPlanAsJSON(p); |
| } |
| } |
| |
| @Override |
| @PublicEvolving |
| public void startNewSession() throws Exception { |
| if (executor != null) { |
| // we need to end the previous session |
| executor.stop(); |
| // create also a new JobID |
| jobID = JobID.generate(); |
| } |
| |
| // create a new local executor |
| executor = PlanExecutor.createLocalExecutor(configuration); |
| executor.setPrintStatusDuringExecution(getConfig().isSysoutLoggingEnabled()); |
| |
| // if we have a session, start the mini cluster eagerly to have it available across sessions |
| if (getSessionTimeout() > 0) { |
| executor.start(); |
| |
| // also install the reaper that will shut it down eventually |
| executorReaper = new ExecutorReaper(executor); |
| } |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Utilities |
| // ------------------------------------------------------------------------ |
| |
| @Override |
| public String toString() { |
| return "Local Environment (parallelism = " + (getParallelism() == ExecutionConfig.PARALLELISM_DEFAULT ? "default" : getParallelism()) |
| + ") : " + getIdString(); |
| } |
| |
| // ------------------------------------------------------------------------ |
| // Reaping the local executor when in session mode |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * This thread shuts down the local executor. |
| * |
| * <p><b>IMPORTANT:</b> This must be a static inner class to hold no reference to the outer class. |
| * Otherwise, the outer class could never become garbage collectible while this thread runs. |
| */ |
| private static class ShutdownThread extends Thread { |
| |
| private final Object monitor = new Object(); |
| |
| private final PlanExecutor executor; |
| |
| private volatile boolean triggered = false; |
| |
| ShutdownThread(PlanExecutor executor) { |
| super("Local cluster reaper"); |
| setDaemon(true); |
| setPriority(Thread.MIN_PRIORITY); |
| |
| this.executor = executor; |
| } |
| |
| @Override |
| public void run() { |
| synchronized (monitor) { |
| while (!triggered) { |
| try { |
| monitor.wait(); |
| } |
| catch (InterruptedException e) { |
| // should never happen |
| } |
| } |
| } |
| |
| try { |
| executor.stop(); |
| } |
| catch (Throwable t) { |
| System.err.println("Cluster reaper caught exception during shutdown"); |
| t.printStackTrace(); |
| } |
| } |
| |
| void trigger() { |
| triggered = true; |
| synchronized (monitor) { |
| monitor.notifyAll(); |
| } |
| } |
| |
| } |
| |
| /** |
| * A class that, upon finalization, shuts down the local mini cluster by triggering the reaper |
| * thread. |
| */ |
| private static class ExecutorReaper { |
| |
| private final ShutdownThread shutdownThread; |
| |
| ExecutorReaper(PlanExecutor executor) { |
| this.shutdownThread = new ShutdownThread(executor); |
| this.shutdownThread.start(); |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| super.finalize(); |
| shutdownThread.trigger(); |
| } |
| } |
| } |