| /** |
| * 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.vaidya.postexdiagnosis.tests; |
| |
| import org.apache.hadoop.vaidya.statistics.job.JobStatistics; |
| import org.apache.hadoop.vaidya.statistics.job.JobStatisticsInterface.JobKeys; |
| import org.apache.hadoop.vaidya.statistics.job.JobStatisticsInterface.KeyDataType; |
| import org.apache.hadoop.vaidya.statistics.job.JobStatisticsInterface.ReduceTaskKeys; |
| import org.apache.hadoop.vaidya.statistics.job.ReduceTaskStatistics; |
| import org.apache.hadoop.vaidya.DiagnosticTest; |
| import org.w3c.dom.Element; |
| import java.util.Hashtable; |
| import java.util.List; |
| |
| /** |
| * |
| */ |
| public class ReducesReExecutionImpact extends DiagnosticTest { |
| |
| private double _impact; |
| private JobStatistics _job; |
| private long _percentReducesReExecuted; |
| |
| /** |
| * |
| */ |
| public ReducesReExecutionImpact() { |
| } |
| |
| /* |
| * Evaluate the test |
| */ |
| @Override |
| public double evaluate(JobStatistics job) { |
| |
| /* |
| * Set the this._job |
| */ |
| this._job = job; |
| |
| /* find job type */ |
| if (job.getStringValue(JobKeys.JOBTYPE).equals("MAP_ONLY")) { |
| this._impact = 0; |
| return this._impact; |
| } |
| |
| /* |
| * Calculate and return the impact |
| */ |
| this._impact = ((job.getLongValue(JobKeys.LAUNCHED_REDUCES) - job.getLongValue(JobKeys.TOTAL_REDUCES))/job.getLongValue(JobKeys.TOTAL_REDUCES)); |
| this._percentReducesReExecuted = Math.round(this._impact * 100); |
| return this._impact; |
| } |
| |
| |
| /* (non-Javadoc) |
| * @see org.apache.hadoop.contrib.utils.perfadvisor.diagnostic_rules.DiagnosticRule#getAdvice() |
| */ |
| @Override |
| public String getPrescription() { |
| return |
| "* Need careful evaluation of why reduce tasks are re-executed. \n" + |
| " * It could be due to some set of unstable cluster nodes.\n" + |
| " * It could be due application specific failures."; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.hadoop.contrib.utils.perfadvisor.diagnostic_rules.DiagnosticRule#getReferenceDetails() |
| */ |
| @Override |
| public String getReferenceDetails() { |
| String ref = |
| "* Total Reduce Tasks: "+this._job.getLongValue(JobKeys.TOTAL_REDUCES)+"\n"+ |
| "* Launched Reduce Tasks: "+this._job.getLongValue(JobKeys.LAUNCHED_REDUCES)+"\n"+ |
| "* Percent Reduce Tasks ReExecuted: "+this._percentReducesReExecuted + "\n" + |
| "* Impact: "+truncate(this._impact); |
| return ref; |
| } |
| } |