TaskTrackerInstrumentation.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:2k
源码类别:
网格计算
开发平台:
Java
- /*
- * 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;
- /**
- * 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) {}
- }