MapRunnable.java
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上传日期:2018-01-08
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- /**
- * 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;
- import java.io.IOException;
- /**
- * Expert: Generic interface for {@link Mapper}s.
- *
- * <p>Custom implementations of <code>MapRunnable</code> can exert greater
- * control on map processing e.g. multi-threaded, asynchronous mappers etc.</p>
- *
- * @see Mapper
- * @deprecated Use {@link org.apache.hadoop.mapreduce.Mapper} instead.
- */
- @Deprecated
- public interface MapRunnable<K1, V1, K2, V2>
- extends JobConfigurable {
-
- /**
- * Start mapping input <tt><key, value></tt> pairs.
- *
- * <p>Mapping of input records to output records is complete when this method
- * returns.</p>
- *
- * @param input the {@link RecordReader} to read the input records.
- * @param output the {@link OutputCollector} to collect the outputrecords.
- * @param reporter {@link Reporter} to report progress, status-updates etc.
- * @throws IOException
- */
- void run(RecordReader<K1, V1> input, OutputCollector<K2, V2> output,
- Reporter reporter)
- throws IOException;
- }