| /* |
| * 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.hadoop.mapred; |
| |
| import java.io.File; |
| import org.apache.hadoop.metrics2.MetricsSystem; |
| import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem; |
| |
| /** |
| * TaskTrackerInstrumentation defines a number of instrumentation points |
| * associated with TaskTrackers. By default, the instrumentation points do |
| * nothing, but subclasses can do arbitrary instrumentation and monitoring at |
| * these points. |
| * |
| * TaskTrackerInstrumentation interfaces are associated uniquely with a |
| * TaskTracker. We don't want an inner class here, because then subclasses |
| * wouldn't have direct access to the associated TaskTracker. |
| * |
| **/ |
| class TaskTrackerInstrumentation { |
| |
| protected final TaskTracker tt; |
| |
| public TaskTrackerInstrumentation(TaskTracker t) { |
| tt = t; |
| } |
| |
| /** |
| * invoked when task attempt t succeeds |
| * @param t |
| */ |
| public void completeTask(TaskAttemptID t) { } |
| |
| public void timedoutTask(TaskAttemptID t) { } |
| |
| public void taskFailedPing(TaskAttemptID t) { } |
| |
| /** |
| * Called just before task attempt t starts. |
| * @param stdout the file containing standard out of the new task |
| * @param stderr the file containing standard error of the new task |
| */ |
| public void reportTaskLaunch(TaskAttemptID t, File stdout, File stderr) { } |
| |
| /** |
| * called when task t has just finished. |
| * @param t |
| */ |
| public void reportTaskEnd(TaskAttemptID t) {} |
| |
| static TaskTrackerInstrumentation create(TaskTracker tt) { |
| return create(tt, DefaultMetricsSystem.INSTANCE); |
| } |
| |
| static TaskTrackerInstrumentation create(TaskTracker tt, MetricsSystem ms) { |
| return ms.register("TaskTrackerMetrics", "TaskTracker metrics", |
| new TaskTrackerMetricsSource(tt)); |
| } |
| |
| } |