NullOutputFormat.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.mapreduce.lib.output;
- import org.apache.hadoop.mapreduce.JobContext;
- import org.apache.hadoop.mapreduce.OutputCommitter;
- import org.apache.hadoop.mapreduce.OutputFormat;
- import org.apache.hadoop.mapreduce.RecordWriter;
- import org.apache.hadoop.mapreduce.TaskAttemptContext;
- /**
- * Consume all outputs and put them in /dev/null.
- */
- public class NullOutputFormat<K, V> extends OutputFormat<K, V> {
-
- @Override
- public RecordWriter<K, V>
- getRecordWriter(TaskAttemptContext context) {
- return new RecordWriter<K, V>(){
- public void write(K key, V value) { }
- public void close(TaskAttemptContext context) { }
- };
- }
-
- @Override
- public void checkOutputSpecs(JobContext context) { }
-
- @Override
- public OutputCommitter getOutputCommitter(TaskAttemptContext context) {
- return new OutputCommitter() {
- public void abortTask(TaskAttemptContext taskContext) { }
- public void cleanupJob(JobContext jobContext) { }
- public void commitTask(TaskAttemptContext taskContext) { }
- public boolean needsTaskCommit(TaskAttemptContext taskContext) {
- return false;
- }
- public void setupJob(JobContext jobContext) { }
- public void setupTask(TaskAttemptContext taskContext) { }
- };
- }
- }