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Diffstat (limited to 'examples')
-rw-r--r-- | examples/src/main/java/org/apache/spark/examples/JavaStatusAPIDemo.java | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/examples/src/main/java/org/apache/spark/examples/JavaStatusAPIDemo.java b/examples/src/main/java/org/apache/spark/examples/JavaStatusAPIDemo.java new file mode 100644 index 0000000000..430e96ab14 --- /dev/null +++ b/examples/src/main/java/org/apache/spark/examples/JavaStatusAPIDemo.java @@ -0,0 +1,70 @@ +/* + * 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.SparkConf; +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 java.util.Arrays; +import java.util.List; + +/** + * Example of using Spark's status APIs from Java. + */ +public final class JavaStatusAPIDemo { + + 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 { + SparkConf sparkConf = new SparkConf().setAppName(APP_NAME); + final JavaSparkContext sc = new JavaSparkContext(sparkConf); + + // Example of implementing a progress reporter for a simple job. + JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5), 5).map( + new IdentityWithDelay<Integer>()); + 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 = sc.getJobInfo(currentJobId); + SparkStageInfo stageInfo = sc.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()); + sc.stop(); + } +} |