/**
* 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.pig.backend.hadoop.executionengine.tez.plan.operator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor;
import org.apache.pig.backend.hadoop.executionengine.tez.runtime.TezInput;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.VisitorException;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.library.api.KeyValueReader;
/**
* POShuffledValueInputTez is used read tuples from a Tez Intermediate output from a shuffle edge
* To be used with POValueOutputTez.
* TODO: To be removed after PIG-3775 and TEZ-661
*/
public class POShuffledValueInputTez extends PhysicalOperator implements TezInput {
private static final long serialVersionUID = 1L;
private static final Log LOG = LogFactory.getLog(POShuffledValueInputTez.class);
private Set<String> inputKeys = new HashSet<String>();
private transient boolean finished = false;
private transient Iterator<KeyValueReader> readers;
private transient KeyValueReader currentReader;
private transient Configuration conf;
private transient Boolean hasFirstRecord;
public POShuffledValueInputTez(OperatorKey k) {
super(k);
}
@Override
public String[] getTezInputs() {
return inputKeys.toArray(new String[inputKeys.size()]);
}
@Override
public void replaceInput(String oldInputKey, String newInputKey) {
while (inputKeys.remove(oldInputKey)) {
inputKeys.add(newInputKey);
}
}
@Override
public void addInputsToSkip(Set<String> inputsToSkip) {
}
@Override
public void attachInputs(Map<String, LogicalInput> inputs,
Configuration conf) throws ExecException {
this.conf = conf;
List<KeyValueReader> readersList = new ArrayList<KeyValueReader>();
try {
for (String inputKey : inputKeys) {
LogicalInput input = inputs.get(inputKey);
if (input == null) {
throw new ExecException("Input from vertex " + inputKey
+ " is missing");
}
KeyValueReader reader = (KeyValueReader) input.getReader();
readersList.add(reader);
LOG.info("Attached input from vertex " + inputKey + " : input="
+ input + ", reader=" + reader);
}
readers = readersList.iterator();
currentReader = readers.next();
// Force input fetch
hasFirstRecord = currentReader.next();
} catch (Exception e) {
throw new ExecException(e);
}
}
@Override
public Result getNextTuple() throws ExecException {
try {
if (finished) {
return RESULT_EOP;
}
do {
if (hasFirstRecord != null) {
if (hasFirstRecord) {
hasFirstRecord = null;
Tuple origTuple = (Tuple) currentReader.getCurrentValue();
Tuple copy = mTupleFactory.newTuple(origTuple.getAll());
return new Result(POStatus.STATUS_OK, copy);
}
hasFirstRecord = null;
} else if (currentReader.next()) {
Tuple origTuple = (Tuple) currentReader.getCurrentValue();
Tuple copy = mTupleFactory.newTuple(origTuple.getAll());
return new Result(POStatus.STATUS_OK, copy);
}
currentReader = readers.hasNext() ? readers.next() : null;
} while (currentReader != null);
finished = true;
// For certain operators (such as STREAM), we could still have some work
// to do even after seeing the last input. These operators set a flag that
// says all input has been sent and to run the pipeline one more time.
if (Boolean.valueOf(conf.get(JobControlCompiler.END_OF_INP_IN_MAP, "false"))) {
this.parentPlan.endOfAllInput = true;
}
return RESULT_EOP;
} catch (IOException e) {
throw new ExecException(e);
}
}
public void addInputKey(String inputKey) {
this.inputKeys.add(inputKey);
}
@Override
public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) {
// TODO Auto-generated method stub
return null;
}
@Override
public void visit(PhyPlanVisitor v) throws VisitorException {
v.visit(this);
}
@Override
public boolean supportsMultipleInputs() {
return false;
}
@Override
public boolean supportsMultipleOutputs() {
return false;
}
@Override
public String name() {
List<String> inputKeyList = new ArrayList<String>(inputKeys);
Collections.sort(inputKeyList);
return "POShuffledValueInputTez - " + mKey.toString() + "\t<-\t " + inputKeyList;
}
}