/**
* 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.processor;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.tez.common.TezUtils;
import org.apache.tez.mapreduce.examples.FilterLinesByWord;
import org.apache.tez.mapreduce.examples.FilterLinesByWord.TextLongPair;
import org.apache.tez.mapreduce.hadoop.MRJobConfig;
import org.apache.tez.mapreduce.input.MRInput;
import org.apache.tez.mapreduce.input.MRInputLegacy;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.LogicalIOProcessor;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.LogicalOutput;
import org.apache.tez.runtime.api.TezProcessorContext;
import org.apache.tez.runtime.library.api.KeyValueReader;
import org.apache.tez.runtime.library.api.KeyValueWriter;
import org.apache.tez.runtime.library.output.OnFileUnorderedKVOutput;
public class FilterByWordInputProcessor implements LogicalIOProcessor {
private static final Log LOG = LogFactory.getLog(FilterByWordInputProcessor.class);
private String filterWord;
public FilterByWordInputProcessor() {
}
@Override
public void initialize(TezProcessorContext processorContext) throws Exception {
Configuration conf = TezUtils.createConfFromUserPayload(processorContext.getUserPayload());
filterWord = conf.get(FilterLinesByWord.FILTER_PARAM_NAME);
if (filterWord == null) {
processorContext.fatalError(null, "No filter word specified");
}
}
@Override
public void handleEvents(List<Event> processorEvents) {
throw new UnsupportedOperationException("Not expecting any events to the broadcast processor");
}
@Override
public void close() throws Exception {
LOG.info("Broadcast Processor closing. Nothing to do");
}
@Override
public void run(Map<String, LogicalInput> inputs,
Map<String, LogicalOutput> outputs) throws Exception {
if (inputs.size() != 1) {
throw new IllegalStateException("FilterByWordInputProcessor processor can only work with a single input");
}
if (outputs.size() != 1) {
throw new IllegalStateException("FilterByWordInputProcessor processor can only work with a single output");
}
LogicalInput li = inputs.values().iterator().next();
if (! (li instanceof MRInput)) {
throw new IllegalStateException("FilterByWordInputProcessor processor can only work with MRInput");
}
LogicalOutput lo = outputs.values().iterator().next();
if (! (lo instanceof OnFileUnorderedKVOutput)) {
throw new IllegalStateException("FilterByWordInputProcessor processor can only work with OnFileUnorderedKVOutput");
}
MRInputLegacy mrInput = (MRInputLegacy) li;
mrInput.init();
OnFileUnorderedKVOutput kvOutput = (OnFileUnorderedKVOutput) lo;
Configuration updatedConf = mrInput.getConfigUpdates();
Text srcFile = new Text();
srcFile.set("UNKNOWN_FILENAME_IN_PROCESSOR");
if (updatedConf != null) {
String fileName = updatedConf.get(MRJobConfig.MAP_INPUT_FILE);
if (fileName != null) {
LOG.info("Processing file: " + fileName);
srcFile.set(fileName);
}
}
KeyValueReader kvReader = mrInput.getReader();
KeyValueWriter kvWriter = kvOutput.getWriter();
while (kvReader.next()) {
Object key = kvReader.getCurrentKey();
Object val = kvReader.getCurrentValue();
Text valText = (Text) val;
String readVal = valText.toString();
if (readVal.contains(filterWord)) {
LongWritable lineNum = (LongWritable) key;
TextLongPair outVal = new TextLongPair(srcFile, lineNum);
kvWriter.write(valText, outVal);
}
}
}
}