| /** |
| * 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.tez.mapreduce.hadoop; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.tez.mapreduce.combine.MRCombiner; |
| import org.apache.tez.mapreduce.partition.MRPartitioner; |
| import org.apache.tez.runtime.library.api.TezRuntimeConfiguration; |
| |
| |
| public final class MultiStageMRConfToTezTranslator { |
| |
| private MultiStageMRConfToTezTranslator() {} |
| |
| /** |
| * Given a single base MRR config, returns a list of complete stage |
| * configurations. |
| * |
| * @return list of complete stage configurations given Conifiguration |
| */ |
| @Private |
| public static Configuration[] getStageConfs(Configuration conf) { |
| int numIntermediateStages = MultiStageMRConfigUtil |
| .getNumIntermediateStages(conf); |
| boolean hasFinalReduceStage = (conf.getInt(MRJobConfig.NUM_REDUCES, 0) > 0); |
| // Assuming no 0 map jobs, and the first stage is always a map. |
| int numStages = numIntermediateStages + (hasFinalReduceStage ? 2 : 1); |
| |
| // Read split info from HDFS |
| conf.setBoolean(MRJobConfig.MR_TEZ_SPLITS_VIA_EVENTS, false); |
| |
| // Setup Tez partitioner class |
| conf.set(TezRuntimeConfiguration.TEZ_RUNTIME_PARTITIONER_CLASS, |
| MRPartitioner.class.getName()); |
| |
| // Setup Tez Combiner class if required. |
| // This would already have been set since the call is via JobClient |
| boolean useNewApi = conf.getBoolean("mapred.mapper.new-api", false); |
| if (useNewApi) { |
| if (conf.get(MRJobConfig.COMBINE_CLASS_ATTR) != null) { |
| conf.set(TezRuntimeConfiguration.TEZ_RUNTIME_COMBINER_CLASS, MRCombiner.class.getName()); |
| } |
| } else { |
| if (conf.get("mapred.combiner.class") != null) { |
| conf.set(TezRuntimeConfiguration.TEZ_RUNTIME_COMBINER_CLASS, MRCombiner.class.getName()); |
| } |
| } |
| |
| Configuration[] confs = new Configuration[numStages]; |
| Configuration nonItermediateConf = MultiStageMRConfigUtil.extractStageConf( |
| conf, ""); |
| confs[0] = nonItermediateConf; |
| if (numStages == 1) { |
| confs[0].setBoolean(MRConfig.IS_MAP_PROCESSOR, true); |
| } else { |
| confs[numStages - 1] = new Configuration(nonItermediateConf); |
| confs[numStages -1].setBoolean(MRConfig.IS_MAP_PROCESSOR, false); |
| } |
| if (numStages > 2) { |
| for (int i = 1; i < numStages - 1; i++) { |
| confs[i] = MultiStageMRConfigUtil.extractStageConf(conf, |
| MultiStageMRConfigUtil.getPropertyNameForIntermediateStage(i, "")); |
| confs[i].setBoolean(MRConfig.IS_MAP_PROCESSOR, false); |
| } |
| } |
| return confs; |
| } |
| } |