| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.ambari.metrics.adservice.prototype.methods.kstest; |
| |
| import org.apache.ambari.metrics.adservice.prototype.common.DataSeries; |
| import org.apache.ambari.metrics.adservice.prototype.common.ResultSet; |
| import org.apache.ambari.metrics.adservice.prototype.core.RFunctionInvoker; |
| import org.apache.ambari.metrics.adservice.prototype.methods.MetricAnomaly; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import java.io.Serializable; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class KSTechnique implements Serializable { |
| |
| private String methodType = "ks"; |
| private Map<String, Double> pValueMap; |
| private static final Log LOG = LogFactory.getLog(KSTechnique.class); |
| |
| public KSTechnique() { |
| pValueMap = new HashMap(); |
| } |
| |
| public MetricAnomaly runKsTest(String key, DataSeries trainData, DataSeries testData) { |
| |
| int testLength = testData.values.length; |
| int trainLength = trainData.values.length; |
| |
| if (trainLength < testLength) { |
| LOG.info("Not enough train data."); |
| return null; |
| } |
| |
| if (!pValueMap.containsKey(key)) { |
| pValueMap.put(key, 0.05); |
| } |
| double pValue = pValueMap.get(key); |
| |
| ResultSet result = RFunctionInvoker.ksTest(trainData, testData, Collections.singletonMap("ks.p_value", String.valueOf(pValue))); |
| if (result == null) { |
| LOG.error("Resultset is null when invoking KS R function..."); |
| return null; |
| } |
| |
| if (result.resultset.size() > 0) { |
| |
| LOG.info("Is size 1 ? result size = " + result.resultset.get(0).length); |
| LOG.info("p_value = " + result.resultset.get(3)[0]); |
| double dValue = result.resultset.get(2)[0]; |
| |
| return new MetricAnomaly(key, |
| (long) testData.ts[testLength - 1], |
| testData.values[testLength - 1], |
| methodType, |
| dValue); |
| } |
| |
| return null; |
| } |
| |
| public void updateModel(String metricKey, boolean increaseSensitivity, double percent) { |
| |
| LOG.info("Updating KS model for " + metricKey + " with increaseSensitivity = " + increaseSensitivity + ", percent = " + percent); |
| |
| if (!pValueMap.containsKey(metricKey)) { |
| LOG.error("Unknown metric key : " + metricKey); |
| LOG.info("pValueMap :" + pValueMap.toString()); |
| return; |
| } |
| |
| double delta = percent / 100; |
| if (!increaseSensitivity) { |
| delta = delta * -1; |
| } |
| |
| double pValue = pValueMap.get(metricKey); |
| double newPValue = Math.min(1.0, pValue + delta * pValue); |
| pValueMap.put(metricKey, newPValue); |
| LOG.info("New pValue = " + newPValue); |
| } |
| |
| } |