/**
* 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.tez.mapreduce.examples.processor;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tez.mapreduce.output.MROutput;
import org.apache.tez.mapreduce.processor.SimpleMRProcessor;
import org.apache.tez.mapreduce.processor.map.MapProcessor;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.LogicalOutput;
import org.apache.tez.runtime.api.ProcessorContext;
import org.apache.tez.runtime.library.api.KeyValueReader;
import org.apache.tez.runtime.library.api.KeyValueWriter;
import org.apache.tez.runtime.library.input.UnorderedKVInput;
public class FilterByWordOutputProcessor extends SimpleMRProcessor {
private static final Log LOG = LogFactory.getLog(MapProcessor.class);
public FilterByWordOutputProcessor(ProcessorContext context) {
super(context);
}
@Override
public void handleEvents(List<Event> processorEvents) {
throw new UnsupportedOperationException("Not expecting any events to the broadcast output processor");
}
@Override
public void close() throws Exception {
LOG.info("Broadcast Output Processor closing. Nothing to do");
}
@Override
public void run() throws Exception {
if (inputs.size() != 1) {
throw new IllegalStateException("FilterByWordOutputProcessor processor can only work with a single input");
}
if (outputs.size() != 1) {
throw new IllegalStateException("FilterByWordOutputProcessor processor can only work with a single output");
}
for (LogicalInput input : inputs.values()) {
input.start();
}
for (LogicalOutput output : outputs.values()) {
output.start();
}
LogicalInput li = inputs.values().iterator().next();
if (! (li instanceof UnorderedKVInput)) {
throw new IllegalStateException("FilterByWordOutputProcessor processor can only work with ShuffledUnorderedKVInput");
}
LogicalOutput lo = outputs.values().iterator().next();
if (! (lo instanceof MROutput)) {
throw new IllegalStateException("FilterByWordOutputProcessor processor can only work with MROutput");
}
UnorderedKVInput kvInput = (UnorderedKVInput) li;
MROutput mrOutput = (MROutput) lo;
KeyValueReader kvReader = kvInput.getReader();
KeyValueWriter kvWriter = mrOutput.getWriter();
while (kvReader.next()) {
Object key = kvReader.getCurrentKey();
Object value = kvReader.getCurrentValue();
kvWriter.write(key, value);
}
}
}