| /* |
| * 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.spark.examples; |
| |
| import org.apache.spark.SparkJobInfo; |
| import org.apache.spark.SparkStageInfo; |
| import org.apache.spark.api.java.JavaFutureAction; |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.spark.api.java.function.Function; |
| import org.apache.spark.sql.SparkSession; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| |
| /** |
| * Example of using Spark's status APIs from Java. |
| */ |
| public final class JavaStatusTrackerDemo { |
| |
| public static final String APP_NAME = "JavaStatusAPIDemo"; |
| |
| public static final class IdentityWithDelay<T> implements Function<T, T> { |
| @Override |
| public T call(T x) throws Exception { |
| Thread.sleep(2 * 1000); // 2 seconds |
| return x; |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| SparkSession spark = SparkSession |
| .builder() |
| .appName(APP_NAME) |
| .getOrCreate(); |
| |
| JavaSparkContext jsc = new JavaSparkContext(spark.sparkContext()); |
| |
| // Example of implementing a progress reporter for a simple job. |
| JavaRDD<Integer> rdd = jsc.parallelize(Arrays.asList(1, 2, 3, 4, 5), 5).map( |
| new IdentityWithDelay<>()); |
| JavaFutureAction<List<Integer>> jobFuture = rdd.collectAsync(); |
| while (!jobFuture.isDone()) { |
| Thread.sleep(1000); // 1 second |
| List<Integer> jobIds = jobFuture.jobIds(); |
| if (jobIds.isEmpty()) { |
| continue; |
| } |
| int currentJobId = jobIds.get(jobIds.size() - 1); |
| SparkJobInfo jobInfo = jsc.statusTracker().getJobInfo(currentJobId); |
| SparkStageInfo stageInfo = jsc.statusTracker().getStageInfo(jobInfo.stageIds()[0]); |
| System.out.println(stageInfo.numTasks() + " tasks total: " + stageInfo.numActiveTasks() + |
| " active, " + stageInfo.numCompletedTasks() + " complete"); |
| } |
| |
| System.out.println("Job results are: " + jobFuture.get()); |
| spark.stop(); |
| } |
| } |