/**
* 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.Map;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.pig.LoadFunc;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigSplit;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad;
import org.apache.pig.backend.hadoop.executionengine.tez.runtime.TezInput;
import org.apache.pig.backend.hadoop.executionengine.tez.runtime.TezTaskConfigurable;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.PigImplConstants;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.tools.pigstats.mapreduce.MRPigStatsUtil;
import org.apache.tez.common.counters.CounterGroup;
import org.apache.tez.common.counters.TezCounter;
import org.apache.tez.mapreduce.input.MRInput;
import org.apache.tez.mapreduce.lib.MRReader;
import org.apache.tez.runtime.api.LogicalInput;
import org.apache.tez.runtime.api.ProcessorContext;
import org.apache.tez.runtime.library.api.KeyValueReader;
/**
* POSimpleTezLoad is used on the backend to read tuples from a Tez MRInput
*/
public class POSimpleTezLoad extends POLoad implements TezInput, TezTaskConfigurable {
private static final long serialVersionUID = 1L;
private String inputKey;
private transient ProcessorContext processorContext;
private transient MRInput input;
private transient KeyValueReader reader;
private transient Configuration conf;
private transient boolean finished = false;
private transient TezCounter inputRecordCounter;
private transient boolean initialized;
private transient boolean noTupleCopy;
public POSimpleTezLoad(OperatorKey k, LoadFunc loader) {
super(k, loader);
}
@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 initialize(ProcessorContext processorContext)
throws ExecException {
this.processorContext = processorContext;
}
@Override
public void addInputsToSkip(Set<String> inputsToSkip) {
}
@Override
public void attachInputs(Map<String, LogicalInput> inputs,
Configuration conf)
throws ExecException {
this.conf = conf;
LogicalInput logInput = inputs.get(inputKey);
if (logInput == null || !(logInput instanceof MRInput)) {
throw new ExecException("POSimpleTezLoad only accepts MRInputs");
}
input = (MRInput) logInput;
try {
reader = input.getReader();
// Set split index, MergeCoGroup need it. And this input is the only input of the
// MergeCoGroup vertex.
if (reader instanceof MRReader) {
int splitIndex = ((PigSplit)((MRReader)reader).getSplit()).getSplitIndex();
PigMapReduce.sJobContext.getConfiguration().setInt(PigImplConstants.PIG_SPLIT_INDEX, splitIndex);
}
} catch (IOException e) {
throw new ExecException(e);
}
// Multiple inputs - other broadcast input like replicate join table, order by sample.
// We use multi input counters to just get MRInput records count.
if (inputs.size() > 1) {
CounterGroup multiInputGroup = processorContext.getCounters()
.getGroup(MRPigStatsUtil.MULTI_INPUTS_COUNTER_GROUP);
if (multiInputGroup == null) {
processorContext.getCounters().addGroup(
MRPigStatsUtil.MULTI_INPUTS_COUNTER_GROUP,
MRPigStatsUtil.MULTI_INPUTS_COUNTER_GROUP);
}
String name = MRPigStatsUtil.getMultiInputsCounterName(super.getLFile().getFileName(), 0);
if (name != null) {
inputRecordCounter = multiInputGroup.addCounter(name, name, 0);
}
}
}
/**
* Previously, we reused the same Result object for all results, but we found
* certain operators (e.g. POStream) save references to the Result object and
* expect it to be constant.
*/
@Override
public Result getNextTuple() throws ExecException {
try {
if (finished) {
return RESULT_EOP;
}
if (!reader.next()) {
// 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;
}
finished = true;
return RESULT_EOP;
} else {
Result res = new Result();
Tuple next = (Tuple) reader.getCurrentValue();
if (!initialized) {
noTupleCopy = mTupleFactory.newTuple(1).getClass().isInstance(next);
initialized = true;
}
// Some Loaders return implementations of DefaultTuple instead of BinSedesTuple
// In that case copy to BinSedesTuple
res.result = noTupleCopy ? next : mTupleFactory.newTupleNoCopy(next.getAll());
res.returnStatus = POStatus.STATUS_OK;
if (inputRecordCounter != null) {
inputRecordCounter.increment(1);
}
return res;
}
} catch (IOException e) {
throw new ExecException(e);
}
}
public void setInputKey(String inputKey) {
this.inputKey = inputKey;
}
}