ReducesReExecutionImpact.java
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上传日期:2018-01-08
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- /**
- * 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;
-
- /*
- * 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;
- }
- }