| /** |
| * 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.mapred.lib.aggregate; |
| |
| import java.util.Map.Entry; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.JobConf; |
| |
| /** |
| * This class implements the common functionalities of |
| * the subclasses of ValueAggregatorDescriptor class. |
| * |
| * @deprecated Use |
| * {@link org.apache.hadoop.mapreduce.lib.aggregate.ValueAggregatorBaseDescriptor} |
| * instead |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class ValueAggregatorBaseDescriptor extends org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor |
| implements ValueAggregatorDescriptor { |
| |
| static public final String UNIQ_VALUE_COUNT = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.UNIQ_VALUE_COUNT; |
| |
| static public final String LONG_VALUE_SUM = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_SUM; |
| |
| static public final String DOUBLE_VALUE_SUM = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.DOUBLE_VALUE_SUM; |
| |
| static public final String VALUE_HISTOGRAM = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.VALUE_HISTOGRAM; |
| |
| static public final String LONG_VALUE_MAX = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_MAX; |
| |
| static public final String LONG_VALUE_MIN = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_MIN; |
| |
| static public final String STRING_VALUE_MAX = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MAX; |
| |
| static public final String STRING_VALUE_MIN = org.apache.hadoop.mapreduce. |
| lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MIN; |
| |
| private static long maxNumItems = Long.MAX_VALUE; |
| |
| /** |
| * |
| * @param type the aggregation type |
| * @param id the aggregation id |
| * @param val the val associated with the id to be aggregated |
| * @return an Entry whose key is the aggregation id prefixed with |
| * the aggregation type. |
| */ |
| public static Entry<Text, Text> generateEntry(String type, String id, Text val) { |
| return org.apache.hadoop.mapreduce.lib.aggregate. |
| ValueAggregatorBaseDescriptor.generateEntry(type, id, val); |
| } |
| |
| /** |
| * |
| * @param type the aggregation type |
| * @return a value aggregator of the given type. |
| */ |
| static public ValueAggregator generateValueAggregator(String type) { |
| ValueAggregator retv = null; |
| if (type.compareToIgnoreCase(LONG_VALUE_SUM) == 0) { |
| retv = new LongValueSum(); |
| } if (type.compareToIgnoreCase(LONG_VALUE_MAX) == 0) { |
| retv = new LongValueMax(); |
| } else if (type.compareToIgnoreCase(LONG_VALUE_MIN) == 0) { |
| retv = new LongValueMin(); |
| } else if (type.compareToIgnoreCase(STRING_VALUE_MAX) == 0) { |
| retv = new StringValueMax(); |
| } else if (type.compareToIgnoreCase(STRING_VALUE_MIN) == 0) { |
| retv = new StringValueMin(); |
| } else if (type.compareToIgnoreCase(DOUBLE_VALUE_SUM) == 0) { |
| retv = new DoubleValueSum(); |
| } else if (type.compareToIgnoreCase(UNIQ_VALUE_COUNT) == 0) { |
| retv = new UniqValueCount(maxNumItems); |
| } else if (type.compareToIgnoreCase(VALUE_HISTOGRAM) == 0) { |
| retv = new ValueHistogram(); |
| } |
| return retv; |
| } |
| |
| /** |
| * get the input file name. |
| * |
| * @param job a job configuration object |
| */ |
| public void configure(JobConf job) { |
| super.configure(job); |
| maxNumItems = job.getLong("aggregate.max.num.unique.values", |
| Long.MAX_VALUE); |
| } |
| } |