tillrohrmann commented on a change in pull request #11473: [FLINK-16705] Ensure MiniCluster shutdown does not interfere with JobResult retrieval URL: https://github.com/apache/flink/pull/11473#discussion_r400230703
########## File path: flink-clients/src/main/java/org/apache/flink/client/program/PerJobMiniCluster.java ########## @@ -0,0 +1,182 @@ +/* + * 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.client.program; + +import org.apache.flink.api.common.JobExecutionResult; +import org.apache.flink.api.common.JobID; +import org.apache.flink.api.common.JobStatus; +import org.apache.flink.configuration.ConfigConstants; +import org.apache.flink.configuration.Configuration; +import org.apache.flink.configuration.RestOptions; +import org.apache.flink.configuration.TaskManagerOptions; +import org.apache.flink.core.execution.JobClient; +import org.apache.flink.runtime.jobgraph.JobGraph; +import org.apache.flink.runtime.jobmaster.JobResult; +import org.apache.flink.runtime.minicluster.MiniCluster; +import org.apache.flink.runtime.minicluster.MiniClusterConfiguration; +import org.apache.flink.runtime.minicluster.RpcServiceSharing; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nullable; + +import java.util.Map; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ExecutionException; +import java.util.function.Function; + +/** + * Starts a {@link MiniCluster} for every submitted job. + * This class guarantees to tear down the MiniCluster in case of normal or exceptional job completion. + * */ +public class PerJobMiniCluster { + + private static final Logger LOG = LoggerFactory.getLogger(PerJobMiniCluster.class); + + private final Configuration configuration; + private final Function<MiniClusterConfiguration, MiniCluster> miniClusterFactory; + + public PerJobMiniCluster() { + this(new Configuration()); + } + + public PerJobMiniCluster(Configuration configuration) { + this(configuration, MiniCluster::new); + } + + public PerJobMiniCluster(Configuration configuration, Function<MiniClusterConfiguration, MiniCluster> miniClusterFactory) { + this.configuration = configuration; + this.miniClusterFactory = miniClusterFactory; + } + + /** + * Starts a {@link MiniCluster} and submits a job. + */ + public CompletableFuture<JobClient> submitJob(JobGraph jobGraph) throws Exception { + MiniClusterConfiguration miniClusterConfig = getMiniClusterConfig(jobGraph.getMaximumParallelism()); + MiniCluster miniCluster = miniClusterFactory.apply(miniClusterConfig); + miniCluster.start(); + + return miniCluster + .submitJob(jobGraph) + .handle((result, throwable) -> { + if (throwable != null) { + try { + throw new RuntimeException("Error submitting job to MiniCluster.", throwable); + } finally { + shutDownCluster(miniCluster); + } + } + return new PerJobMiniClusterJobClient(result.getJobID(), miniCluster); + }); + } + + private MiniClusterConfiguration getMiniClusterConfig(int maximumParallelism) { + Configuration configuration = this.configuration.clone(); + + if (!configuration.contains(RestOptions.BIND_PORT)) { + configuration.setString(RestOptions.BIND_PORT, "0"); + } + + int numTaskManagers = configuration.getInteger( + ConfigConstants.LOCAL_NUMBER_TASK_MANAGER, + ConfigConstants.DEFAULT_LOCAL_NUMBER_TASK_MANAGER); + + // we have to use the maximum parallelism as a default here, otherwise streaming pipelines would not run + int numSlotsPerTaskManager = configuration.getInteger(TaskManagerOptions.NUM_TASK_SLOTS, maximumParallelism); + + return new MiniClusterConfiguration.Builder() + .setConfiguration(configuration) + .setNumTaskManagers(numTaskManagers) + .setRpcServiceSharing(RpcServiceSharing.SHARED) + .setNumSlotsPerTaskManager(numSlotsPerTaskManager) + .build(); + } + + private static void shutDownCluster(MiniCluster miniCluster) { + try { + miniCluster.closeAsync().get(); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } catch (ExecutionException e) { + LOG.error("Error while shutting down cluster", e); + } + } + + /** + * A {@link JobClient} for a {@link PerJobMiniCluster}. + */ + private static class PerJobMiniClusterJobClient implements JobClient { + + private final JobID jobID; + private final MiniCluster miniCluster; + private final CompletableFuture<JobResult> jobResultFuture; + + public PerJobMiniClusterJobClient(JobID jobID, MiniCluster miniCluster) { Review comment: Public constructor in a non-public class. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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