Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/2425#discussion_r17688175 --- Diff: core/src/main/java/org/apache/spark/TaskContext.java --- @@ -0,0 +1,234 @@ +/* + * 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; + +import java.io.Serializable; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; + +import scala.Function0; +import scala.Function1; +import scala.Unit; +import scala.collection.JavaConversions; + +import org.apache.spark.annotation.DeveloperApi; +import org.apache.spark.executor.TaskMetrics; +import org.apache.spark.util.TaskCompletionListener; +import org.apache.spark.util.TaskCompletionListenerException; + +/** +* :: DeveloperApi :: +* Contextual information about a task which can be read or mutated during execution. +*/ +@DeveloperApi +public class TaskContext implements Serializable { + + private Integer stageId; + private Integer partitionId; + private Long attemptId; + private Boolean runningLocally; + private TaskMetrics taskMetrics; + + /** + * :: DeveloperApi :: + * Contextual information about a task which can be read or mutated during execution. + * + * @param stageId stage id + * @param partitionId index of the partition + * @param attemptId the number of attempts to execute this task + * @param runningLocally whether the task is running locally in the driver JVM + * @param taskMetrics performance metrics of the task + */ + @DeveloperApi + public TaskContext(Integer stageId, Integer partitionId, Long attemptId, Boolean runningLocally, + TaskMetrics taskMetrics) { + this.attemptId = attemptId; + this.partitionId = partitionId; + this.runningLocally = runningLocally; + this.stageId = stageId; + this.taskMetrics = taskMetrics; + taskContext.set(this); + } + + + /** + * :: DeveloperApi :: + * Contextual information about a task which can be read or mutated during execution. + * + * @param stageId stage id + * @param partitionId index of the partition + * @param attemptId the number of attempts to execute this task + * @param runningLocally whether the task is running locally in the driver JVM + */ + @DeveloperApi + public TaskContext(Integer stageId, Integer partitionId, Long attemptId, + Boolean runningLocally) { + this.attemptId = attemptId; + this.partitionId = partitionId; + this.runningLocally = runningLocally; + this.stageId = stageId; + this.taskMetrics = TaskMetrics.empty(); + taskContext.set(this); + } + + + /** + * :: DeveloperApi :: + * Contextual information about a task which can be read or mutated during execution. + * + * @param stageId stage id + * @param partitionId index of the partition + * @param attemptId the number of attempts to execute this task + */ + @DeveloperApi + public TaskContext(Integer stageId, Integer partitionId, Long attemptId) { + this.attemptId = attemptId; + this.partitionId = partitionId; + this.runningLocally = false; + this.stageId = stageId; + this.taskMetrics = TaskMetrics.empty(); + taskContext.set(this); + } + + private static ThreadLocal<TaskContext> taskContext = --- End diff -- I would remove this and the below function. I think it's better it the `TaskContext` class is not itself aware of being stored as a thread local. We can keep all the logic related to thread locals in the static code.
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