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Merge branch 'master' of git@github.com:DataSketches/sketches-pig.git
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leerho committed Apr 25, 2019
2 parents 6bdbfa3 + 1984c46 commit ab5d9ddcfae36ef8b62a866a7cdce590ad055a8d
Showing 38 changed files with 4,077 additions and 4 deletions.
@@ -8,7 +8,7 @@

<groupId>com.yahoo.datasketches</groupId>
<artifactId>sketches-pig</artifactId>
<version>0.11.1-SNAPSHOT</version>
<version>0.13.1-SNAPSHOT</version>

<!-- Project Information -->
<name>${project.groupId}:${project.artifactId}</name>
@@ -145,15 +145,14 @@
<dependency>
<groupId>com.yahoo.datasketches</groupId>
<artifactId>sketches-core</artifactId>
<version>0.11.0</version>
<version>0.13.0</version>
</dependency>

<!-- Pig -->
<dependency>
<groupId>org.apache.pig</groupId>
<artifactId>pig</artifactId>
<version>0.16.0</version>
<classifier>h2</classifier>
<version>0.17.0</version>
<scope>provided</scope>
</dependency>

@@ -0,0 +1,126 @@
/*
* Copyright 2019, Verizon Media.
* Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
*/

package com.yahoo.sketches.pig.cpc;

import java.io.IOException;

import org.apache.log4j.Logger;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.Tuple;

import com.yahoo.sketches.cpc.CpcSketch;
import com.yahoo.sketches.cpc.CpcUnion;

/**
* Class used to calculate the final pass of an <i>Algebraic</i> sketch
* operation. It will receive a bag of values returned by either the <i>Intermediate</i>
* stage or the <i>Initial</i> stages, so it needs to be able to differentiate between and
* interpret both types.
*
* @author Alexander Saydakov
*/
abstract class AlgebraicFinal extends EvalFunc<DataByteArray> {

private final int lgK_;
private final long seed_;
private DataByteArray emptySketch_; // this is to cash an empty sketch tuple
private boolean isFirstCall_ = true; // for logging

/**
* Constructor with primitives for the final passes of an Algebraic function.
*
* @param lgK parameter controlling the sketch size and accuracy
* @param seed for the hash function
*/
public AlgebraicFinal(final int lgK, final long seed) {
lgK_ = lgK;
seed_ = seed;
}

@Override
public DataByteArray exec(final Tuple inputTuple) throws IOException {
if (isFirstCall_) {
Logger.getLogger(getClass()).info("Algebraic was used");
isFirstCall_ = false;
}
final DataByteArray dba = process(inputTuple, lgK_, seed_, isInputRaw());
if (dba == null) {
return getEmptySketch();
}
return dba;
}

static DataByteArray process(final Tuple inputTuple, final int lgK, final long seed, boolean isInputRaw) throws IOException {
if (inputTuple == null || inputTuple.size() == 0) {
return null;
}
CpcSketch sketch = null;
CpcUnion union = null;
final DataBag outerBag = (DataBag) inputTuple.get(0);
if (outerBag == null) {
return null;
}
for (final Tuple dataTuple: outerBag) {
final Object f0 = dataTuple.get(0); // inputTuple.bag0.dataTupleN.f0
if (f0 == null) {
continue;
}
if (f0 instanceof DataBag) {
final DataBag innerBag = (DataBag) f0; // inputTuple.bag0.dataTupleN.f0:bag
if (innerBag.size() == 0) { continue; }
// If field 0 of a dataTuple is a Bag, all innerTuples of this inner bag
// will be passed into the union.
// It is due to system bagged outputs from multiple mapper Initial functions.
// The Intermediate stage was bypassed.
if (isInputRaw) {
if (sketch == null) {
sketch = new CpcSketch(lgK, seed);
}
DataToSketch.updateSketch(innerBag, sketch);
} else {
if (union == null) {
union = new CpcUnion(lgK, seed);
}
UnionSketch.updateUnion(innerBag, union, seed);
}
} else if (f0 instanceof DataByteArray) { // inputTuple.bag0.dataTupleN.f0:DBA
// If field 0 of a dataTuple is a DataByteArray, we assume it is a sketch
// due to system bagged outputs from multiple mapper Intermediate functions.
// Each dataTuple.DBA:sketch will merged into the union.
final DataByteArray dba = (DataByteArray) f0;
if (union == null) {
union = new CpcUnion(lgK, seed);
}
union.update(CpcSketch.heapify(dba.get(), seed));
} else { // we should never get here
throw new IllegalArgumentException("dataTuple.Field0 is not a DataBag or DataByteArray: "
+ f0.getClass().getName());
}
}
if (sketch != null && union != null) {
union.update(sketch);
sketch = null;
}
if (sketch != null) {
return new DataByteArray(sketch.toByteArray());
} else if (union != null) {
return new DataByteArray(union.getResult().toByteArray());
}
return null;
}

abstract boolean isInputRaw();

private DataByteArray getEmptySketch() {
if (emptySketch_ == null) {
emptySketch_ = new DataByteArray(new CpcSketch(lgK_, seed_).toByteArray());
}
return emptySketch_;
}

}
@@ -0,0 +1,57 @@
/*
* Copyright 2019, Verizon Media.
* Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
*/

package com.yahoo.sketches.pig.cpc;

import java.io.IOException;

import org.apache.log4j.Logger;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;

/**
* Class used to calculate the initial pass of an Algebraic sketch operation.
*
* <p>The Initial class simply passes through all records unchanged so that they can be
* processed by the intermediate processor instead.
*
* @author Alexander Saydakov
*/
public class AlgebraicInitial extends EvalFunc<Tuple> {

private boolean isFirstCall_ = true;

/**
* Default constructor for the initial pass of an Algebraic function.
*/
public AlgebraicInitial() {}

/**
* Constructor for the initial pass of an Algebraic function. Pig will call this and pass the
* same constructor arguments as the original UDF. In this case the arguments are ignored.
*
* @param lgK in a form of a String
*/
public AlgebraicInitial(final String lgK) {}

/**
* Constructor for the initial pass of an Algebraic function. Pig will call this and pass the
* same constructor arguments as the original UDF. In this case the arguments are ignored.
*
* @param lgK in a form of a String
* @param seed in a form of a String
*/
public AlgebraicInitial(final String lgK, final String seed) {}

@Override
public Tuple exec(final Tuple inputTuple) throws IOException {
if (isFirstCall_) {
Logger.getLogger(getClass()).info("Algebraic was used");
isFirstCall_ = false;
}
return inputTuple;
}

}
@@ -0,0 +1,70 @@
/*
* Copyright 2019, Verizon Media.
* Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
*/

package com.yahoo.sketches.pig.cpc;

import java.io.IOException;

import org.apache.log4j.Logger;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;

import com.yahoo.sketches.cpc.CpcSketch;

/**
* Class used to calculate the intermediate combiner pass of an <i>Algebraic</i> sketch
* operation. This is called from the combiner, and may be called multiple times (from a mapper
* and from a reducer). It will receive a bag of values returned by either <i>Intermediate</i>
* or <i>Initial</i> stages, so it needs to be able to differentiate between and
* interpret both types.
*
* @author Alexander Saydakov
*/
abstract class AlgebraicIntermediate extends EvalFunc<Tuple> {

private static final TupleFactory TUPLE_FACTORY = TupleFactory.getInstance();

private final int lgK_;
private final long seed_;
private Tuple emptySketchTuple_; // this is to cash an empty sketch tuple
private boolean isFirstCall_ = true; // for logging

/**
* Constructor with primitives for the intermediate pass of an Algebraic function.
*
* @param lgK parameter controlling the sketch size and accuracy
* @param seed
*/
public AlgebraicIntermediate(final int lgK, final long seed) {
lgK_ = lgK;
seed_ = seed;
}

@Override
public Tuple exec(final Tuple inputTuple) throws IOException {
if (isFirstCall_) {
Logger.getLogger(getClass()).info("Algebraic was used");
isFirstCall_ = false;
}
final DataByteArray dba = AlgebraicFinal.process(inputTuple, lgK_, seed_, isInputRaw());
if (dba == null) {
return getEmptySketchTuple();
}
return TUPLE_FACTORY.newTuple(dba);
}

abstract boolean isInputRaw();

private Tuple getEmptySketchTuple() {
if (emptySketchTuple_ == null) {
emptySketchTuple_ = TUPLE_FACTORY.newTuple(new DataByteArray(
new CpcSketch(lgK_, seed_).toByteArray()));
}
return emptySketchTuple_;
}

}

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