/**
* 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.HashMap;
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.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.pig.backend.executionengine.ExecException;
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.backend.hadoop.executionengine.tez.runtime.TezOutput;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
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.api.LogicalOutput;
import org.apache.tez.runtime.library.api.KeyValueWriter;
import org.apache.tez.runtime.library.api.KeyValuesReader;
/**
* POCounterStatsTez is used to group counters from previous vertex POCounterTez tasks
*/
public class POCounterStatsTez extends PhysicalOperator implements TezInput, TezOutput {
private static final long serialVersionUID = 1L;
private static final Log LOG = LogFactory.getLog(POCounterStatsTez.class);
private String inputKey;
private String outputKey;
// TODO: Even though we expect only one record from POCounter, because of Shuffle we have
// KeyValuesReader. After TEZ-661, switch to unsorted shuffle
private transient KeyValuesReader reader;
private transient KeyValueWriter writer;
public POCounterStatsTez(OperatorKey k) {
super(k);
}
@Override
public String[] getTezInputs() {
return new String[] { inputKey };
}
@Override
public void replaceInput(String oldInputKey, String newInputKey) {
if (oldInputKey.equals(inputKey)) {
inputKey = newInputKey;
}
}
@Override
public void addInputsToSkip(Set<String> inputsToSkip) {
}
@Override
public void attachInputs(Map<String, LogicalInput> inputs,
Configuration conf)
throws ExecException {
LogicalInput input = inputs.get(inputKey);
if (input == null) {
throw new ExecException("Input from vertex " + inputKey + " is missing");
}
try {
reader = (KeyValuesReader) input.getReader();
LOG.info("Attached input from vertex " + inputKey + " : input=" + input + ", reader=" + reader);
} catch (Exception e) {
throw new ExecException(e);
}
}
@Override
public String[] getTezOutputs() {
return new String[] { outputKey };
}
@Override
public void replaceOutput(String oldOutputKey, String newOutputKey) {
if (oldOutputKey.equals(outputKey)) {
outputKey = newOutputKey;
}
}
@Override
public void attachOutputs(Map<String, LogicalOutput> outputs,
Configuration conf) throws ExecException {
LogicalOutput output = outputs.get(outputKey);
if (output == null) {
throw new ExecException("Output to vertex " + outputKey + " is missing");
}
try {
writer = (KeyValueWriter) output.getWriter();
LOG.info("Attached output to vertex " + outputKey + " : output=" + output + ", writer=" + writer);
} catch (Exception e) {
throw new ExecException(e);
}
}
@Override
public Result getNextTuple() throws ExecException {
try {
Map<Integer, Long> counterRecords = new HashMap<Integer, Long>();
Integer key = null;
Long value = null;
// Read count of records per task
while (reader.next()) {
key = ((IntWritable)reader.getCurrentKey()).get();
for (Object val : reader.getCurrentValues()) {
value = ((LongWritable)val).get();
counterRecords.put(key, value);
}
}
// BinInterSedes only takes String for map key
Map<String, Long> counterOffsets = new HashMap<String, Long>();
// Create a map to contain task ids and beginning offset of record count
// based on total record count of all tasks
// For eg: If Task 0 has 5 records, Task 1 has 10 records and Task 2 has 3 records
// map will contain {0=0, 1=5, 2=15}
Long prevTasksCount = counterRecords.get(0);
counterOffsets.put("0", 0L);
for (int i = 1; i < counterRecords.size(); i++) {
counterOffsets.put("" + i, prevTasksCount);
prevTasksCount += counterRecords.get(i);
}
Tuple tuple = TupleFactory.getInstance().newTuple(1);
tuple.set(0, counterOffsets);
writer.write(POValueOutputTez.EMPTY_KEY, tuple);
return RESULT_EOP;
} catch (IOException e) {
throw new ExecException(e);
}
}
public void setInputKey(String inputKey) {
this.inputKey = inputKey;
}
public void setOutputKey(String outputKey) {
this.outputKey = outputKey;
}
@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() {
return "PORankStatsTez - " + mKey.toString() + "\t<-\t " + inputKey + "\t->\t " + outputKey;
}
}