| /** |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * 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.hbase.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.hbase.client.Result; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.MapReduceBase; |
| import org.apache.hadoop.mapred.OutputCollector; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| /** |
| * Pass the given key and record as-is to reduce |
| */ |
| @Deprecated |
| public class IdentityTableMap |
| extends MapReduceBase |
| implements TableMap<ImmutableBytesWritable, Result> { |
| |
| /** constructor */ |
| public IdentityTableMap() { |
| super(); |
| } |
| |
| /** |
| * Use this before submitting a TableMap job. It will |
| * appropriately set up the JobConf. |
| * |
| * @param table table name |
| * @param columns columns to scan |
| * @param mapper mapper class |
| * @param job job configuration |
| */ |
| @SuppressWarnings("unchecked") |
| public static void initJob(String table, String columns, |
| Class<? extends TableMap> mapper, JobConf job) { |
| TableMapReduceUtil.initTableMapJob(table, columns, mapper, |
| ImmutableBytesWritable.class, |
| Result.class, job); |
| } |
| |
| /** |
| * Pass the key, value to reduce |
| * @param key |
| * @param value |
| * @param output |
| * @param reporter |
| * @throws IOException |
| */ |
| public void map(ImmutableBytesWritable key, Result value, |
| OutputCollector<ImmutableBytesWritable,Result> output, |
| Reporter reporter) throws IOException { |
| |
| // convert |
| output.collect(key, value); |
| } |
| } |