org.apache.hadoop.hive.ql.exec.tez.NullMROutput Maven / Gradle / Ivy
/*
* 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.hive.ql.exec.tez;
import org.apache.tez.mapreduce.output.MROutput;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.OutputContext;
import org.apache.tez.runtime.library.api.KeyValueWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.List;
public class NullMROutput extends MROutput {
private static final Logger LOG = LoggerFactory.getLogger(NullMROutput.class);
public NullMROutput(OutputContext outputContext, int numPhysicalOutputs) {
super(outputContext, numPhysicalOutputs);
}
@Override
public List initialize() throws IOException, InterruptedException {
List events = initializeBase();
return events;
}
/**
* Get a key value write to write Map Reduce compatible output
*/
@Override
public KeyValueWriter getWriter() throws IOException {
return new KeyValueWriter() {
@SuppressWarnings("unchecked")
@Override
public void write(Object key, Object value) throws IOException {
throw new IOException("NullMROutput is not configured for actual rows");
}
};
}
/**
* Call this in the processor before finishing to ensure outputs that
* outputs have been flushed. Must be called before commit.
* @throws IOException
*/
@Override
public void flush() throws IOException {
}
}