| /** |
| * 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.ambari.metrics.core.timeline.aggregators; |
| |
| import static org.apache.ambari.metrics.core.timeline.query.PhoenixTransactSQL.TOPN_DOWNSAMPLER_CLUSTER_METRIC_SELECT_SQL; |
| import static org.apache.ambari.metrics.core.timeline.query.PhoenixTransactSQL.TOPN_DOWNSAMPLER_HOST_METRIC_SELECT_SQL; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.ambari.metrics.core.timeline.query.TopNCondition; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.metrics2.sink.timeline.TopNConfig; |
| |
| public class TopNDownSampler implements CustomDownSampler { |
| |
| private TopNConfig topNConfig; |
| private static final Log LOG = LogFactory.getLog(TopNDownSampler.class); |
| protected String metricPatterns; |
| |
| public static TopNDownSampler fromConfig(Map<String, String> conf) { |
| String metricPatterns = conf.get(DownSamplerUtils.downSamplerConfigPrefix + DownSamplerUtils.topNDownSamplerKey + "." + |
| DownSamplerUtils.downSamplerMetricPatternsConfig); |
| |
| String topNString = conf.get(DownSamplerUtils.downSamplerConfigPrefix + "topn.value"); |
| Integer topNValue = topNString != null ? Integer.valueOf(topNString) : 10; |
| String topNFunction = conf.get(DownSamplerUtils.downSamplerConfigPrefix + "topn.function"); |
| |
| return new TopNDownSampler(new TopNConfig(topNValue, topNFunction, false), metricPatterns); |
| } |
| |
| public TopNDownSampler(TopNConfig topNConfig, String metricPatterns) { |
| this.topNConfig = topNConfig; |
| this.metricPatterns = metricPatterns; |
| } |
| |
| @Override |
| public boolean validateConfigs() { |
| if (topNConfig == null) { |
| return false; |
| } |
| |
| if (topNConfig.getTopN() <= 0) { |
| return false; |
| } |
| |
| if (StringUtils.isEmpty(metricPatterns)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Prepare downsampling SELECT statement(s) used to determine the data to be written into the Aggregate table. |
| * @param startTime |
| * @param endTime |
| * @param tableName |
| * @return |
| */ |
| @Override |
| public List<String> prepareDownSamplingStatement(Long startTime, Long endTime, String tableName) { |
| List<String> stmts = new ArrayList<>(); |
| |
| Function.ReadFunction readFunction = Function.ReadFunction.getFunction(topNConfig.getTopNFunction()); |
| Function function = new Function(readFunction, null); |
| String columnSelect = TopNCondition.getColumnSelect(function); |
| |
| List<String> metricPatternList = Arrays.asList(metricPatterns.split(",")); |
| |
| for (String metricPattern : metricPatternList) { |
| String metricPatternClause = "'" + metricPattern + "'"; |
| //TODO : Need a better way to find out what kind of aggregation the current one is. |
| if (tableName.contains("RECORD")) { |
| stmts.add(String.format(TOPN_DOWNSAMPLER_HOST_METRIC_SELECT_SQL, |
| endTime, columnSelect, columnSelect, columnSelect, tableName, metricPatternClause, |
| startTime, endTime, columnSelect, topNConfig.getTopN())); |
| } else { |
| stmts.add(String.format(TOPN_DOWNSAMPLER_CLUSTER_METRIC_SELECT_SQL, |
| endTime, columnSelect, columnSelect, columnSelect, tableName, metricPatternClause, |
| startTime, endTime, columnSelect, topNConfig.getTopN())); |
| } |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("DownSampling Stmt: " + stmts.toString()); |
| } |
| |
| return stmts; |
| } |
| |
| } |