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/*
* 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.newplan;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.util.Pair;
public abstract class BaseOperatorPlan implements OperatorPlan {
protected List ops;
protected PlanEdge fromEdges;
protected PlanEdge toEdges;
protected PlanEdge softFromEdges;
protected PlanEdge softToEdges;
private List roots;
private List leaves;
protected static final Log log =
LogFactory.getLog(BaseOperatorPlan.class);
public BaseOperatorPlan() {
ops = new ArrayList();
roots = new ArrayList();
leaves = new ArrayList();
fromEdges = new PlanEdge();
toEdges = new PlanEdge();
softFromEdges = new PlanEdge();
softToEdges = new PlanEdge();
}
@SuppressWarnings("unchecked")
public BaseOperatorPlan(BaseOperatorPlan other) {
// (shallow) copy constructor
ops = (List) ((ArrayList) other.ops).clone();
roots = (List) ((ArrayList) other.roots).clone();
leaves = (List) ((ArrayList) other.leaves).clone();
fromEdges = other.fromEdges.shallowClone();
toEdges = other.toEdges.shallowClone();
softFromEdges = other.softFromEdges.shallowClone();
softToEdges = other.softToEdges.shallowClone();
}
/**
* Get number of nodes in the plan.
*/
public int size() {
return ops.size();
}
/**
* Get all operators in the plan that have no predecessors.
* @return all operators in the plan that have no predecessors, or
* an empty list if the plan is empty.
*/
public List getSources() {
if (roots.size() == 0 && ops.size() > 0) {
for (Operator op : ops) {
if (toEdges.get(op) == null) {
roots.add(op);
}
}
}
return roots;
}
/**
* Get all operators in the plan that have no successors.
* @return all operators in the plan that have no successors, or
* an empty list if the plan is empty.
*/
public List getSinks() {
if (leaves.size() == 0 && ops.size() > 0) {
for (Operator op : ops) {
if (fromEdges.get(op) == null) {
leaves.add(op);
}
}
}
return leaves;
}
/**
* For a given operator, get all operators immediately before it in the
* plan.
* @param op operator to fetch predecessors of
* @return list of all operators imeediately before op, or an empty list
* if op is a root.
*/
public List getPredecessors(Operator op) {
return toEdges.get(op);
}
/**
* For a given operator, get all operators immediately after it.
* @param op operator to fetch successors of
* @return list of all operators imeediately after op, or an empty list
* if op is a leaf.
*/
public List getSuccessors(Operator op) {
return fromEdges.get(op);
}
/**
* For a given operator, get all operators softly immediately before it in the
* plan.
* @param op operator to fetch predecessors of
* @return list of all operators immediately before op, or an empty list
* if op is a root.
*/
public List getSoftLinkPredecessors(Operator op) {
return softToEdges.get(op);
}
/**
* For a given operator, get all operators softly immediately after it.
* @param op operator to fetch successors of
* @return list of all operators immediately after op, or an empty list
* if op is a leaf.
*/
public List getSoftLinkSuccessors(Operator op) {
return softFromEdges.get(op);
}
/**
* Add a new operator to the plan. It will not be connected to any
* existing operators.
* @param op operator to add
*/
public void add(Operator op) {
markDirty();
if (!ops.contains(op))
ops.add(op);
}
/**
* Remove an operator from the plan.
* @param op Operator to be removed
* @throws FrontendException if the remove operation attempts to
* remove an operator that is still connected to other operators.
*/
public void remove(Operator op) throws FrontendException {
if (fromEdges.containsKey(op) || toEdges.containsKey(op)) {
throw new FrontendException("Attempt to remove operator " + op.getName()
+ " that is still connected in the plan", 2243);
}
if (softFromEdges.containsKey(op) || softToEdges.containsKey(op)) {
throw new FrontendException("Attempt to remove operator " + op.getName()
+ " that is still softly connected in the plan", 2243);
}
markDirty();
ops.remove(op);
}
/**
* Connect two operators in the plan, controlling which position in the
* edge lists that the from and to edges are placed.
* @param from Operator edge will come from
* @param fromPos Position in the array for the from edge
* @param to Operator edge will go to
* @param toPos Position in the array for the to edge
*/
public void connect(Operator from,
int fromPos,
Operator to,
int toPos) {
markDirty();
fromEdges.put(from, to, fromPos);
toEdges.put(to, from, toPos);
}
/**
* Check if given two operators are directly connected.
* @param from Operator edge will come from
* @param to Operator edge will go to
*/
public boolean isConnected(Operator from, Operator to) {
List preds = getPredecessors( to );
return ( preds != null ) && preds.contains( from );
}
/**
* Connect two operators in the plan.
* @param from Operator edge will come from
* @param to Operator edge will go to
*/
public void connect(Operator from, Operator to) {
if( isConnected( from, to ) )
return;
markDirty();
fromEdges.put(from, to);
toEdges.put(to, from);
}
/**
* Create an soft edge between two nodes.
* @param from Operator dependent upon
* @param to Operator having the dependency
*/
public void createSoftLink(Operator from, Operator to) {
softFromEdges.put(from, to);
softToEdges.put(to, from);
}
/**
* Remove an soft edge
* @param from Operator dependent upon
* @param to Operator having the dependency
*/
public void removeSoftLink(Operator from, Operator to) {
softFromEdges.remove(from, to);
softToEdges.remove(to, from);
}
/**
* Disconnect two operators in the plan.
* @param from Operator edge is coming from
* @param to Operator edge is going to
* @return pair of positions, indicating the position in the from and
* to arrays.
* @throws FrontendException if the two operators aren't connected.
*/
public Pair disconnect(Operator from,
Operator to) throws FrontendException {
Pair f = fromEdges.removeWithPosition(from, to);
if (f == null) {
throw new FrontendException("Attempt to disconnect operators " +
from.getName() + " and " + to.getName() +
" which are not connected.", 2219);
}
Pair t = toEdges.removeWithPosition(to, from);
if (t == null) {
throw new FrontendException("Plan in inconssistent state " +
from.getName() + " and " + to.getName() +
" connected in fromEdges but not toEdges.", 2220);
}
markDirty();
return new Pair(f.second, t.second);
}
private void markDirty() {
roots.clear();
leaves.clear();
}
public Iterator getOperators() {
return ops.iterator();
}
public boolean isEqual(OperatorPlan other) throws FrontendException {
return isEqual(this, other);
}
private static boolean checkPredecessors(Operator op1,
Operator op2) throws FrontendException {
List preds = op1.getPlan().getPredecessors(op1);
List otherPreds = op2.getPlan().getPredecessors(op2);
if (preds == null && otherPreds == null) {
// intentionally blank
} else if (preds == null || otherPreds == null) {
return false;
} else {
if (preds.size() != otherPreds.size()) return false;
for (int i = 0; i < preds.size(); i++) {
Operator p1 = preds.get(i);
Operator p2 = otherPreds.get(i);
if (!p1.isEqual(p2)) return false;
if (!checkPredecessors(p1, p2)) return false;
}
}
return true;
}
protected static boolean isEqual(OperatorPlan p1, OperatorPlan p2) throws FrontendException {
if (p1 == p2) {
return true;
}
if (p1 != null && p2 != null) {
List leaves = p1.getSinks();
List otherLeaves = p2.getSinks();
if (leaves.size() != otherLeaves.size()) return false;
// Must find some leaf that is equal to each leaf. There is no
// guarantee leaves will be returned in any particular order.
boolean foundAll = true;
for (Operator op1 : leaves) {
boolean foundOne = false;
for (Operator op2 : otherLeaves) {
if (op1.isEqual(op2) && checkPredecessors(op1, op2)) {
foundOne = true;
break;
}
}
foundAll &= foundOne;
if (!foundAll) return false;
}
return foundAll;
}
return false;
}
public void explain(PrintStream ps, String format, boolean verbose) throws FrontendException {
}
@Override
public String toString() {
ByteArrayOutputStream os = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(os);
try {
explain(ps,"",false);
} catch (FrontendException e) {
return "";
}
return os.toString();
}
@Override
public void replace(Operator oldOperator, Operator newOperator) throws FrontendException {
add(newOperator);
List preds = getPredecessors(oldOperator);
if (preds!=null) {
List predsCopy = new ArrayList();
predsCopy.addAll(preds);
for (int i=0;i pos = disconnect(pred, oldOperator);
connect(pred, pos.first, newOperator, i);
}
}
List succs = getSuccessors(oldOperator);
if (succs!=null) {
List succsCopy = new ArrayList();
succsCopy.addAll(succs);
for (int i=0;i pos = disconnect(oldOperator, succ);
connect(newOperator, i, succ, pos.second);
}
}
remove(oldOperator);
}
// We assume if node has multiple inputs, it only has one output;
// if node has multiple outputs, it only has one input.
// Otherwise, we don't know how to connect inputs to outputs.
// This assumption is true for logical plan/physical plan, and most MR plan
@Override
public void removeAndReconnect(Operator operatorToRemove) throws FrontendException {
List predsCopy = null;
if (getPredecessors(operatorToRemove)!=null && getPredecessors(operatorToRemove).size()!=0) {
predsCopy = new ArrayList();
predsCopy.addAll(getPredecessors(operatorToRemove));
}
List succsCopy = null;
if (getSuccessors(operatorToRemove)!=null && getSuccessors(operatorToRemove).size()!=0) {
succsCopy = new ArrayList();
succsCopy.addAll(getSuccessors(operatorToRemove));
}
if (predsCopy!=null && predsCopy.size()>1 && succsCopy!=null && succsCopy.size()>1) {
throw new FrontendException("Cannot remove and reconnect node with multiple inputs/outputs", 2256);
}
if (predsCopy!=null && predsCopy.size()>1) {
// node has multiple inputs, it can only has one output (or no output)
// reconnect inputs to output
Operator succ = null;
Pair pos2 = null;
if (succsCopy!=null) {
succ = succsCopy.get(0);
pos2 = disconnect(operatorToRemove, succ);
}
for (Operator pred : predsCopy) {
Pair pos1 = disconnect(pred, operatorToRemove);
if (succ!=null) {
connect(pred, pos1.first, succ, pos2.second);
}
}
} else if (succsCopy!=null && succsCopy.size()>1) {
// node has multiple outputs, it can only has one output (or no output)
// reconnect input to outputs
Operator pred = null;
Pair pos1 = null;
if (predsCopy!=null) {
pred = predsCopy.get(0);
pos1 = disconnect(pred, operatorToRemove);
}
for (Operator succ : succsCopy) {
Pair pos2 = disconnect(operatorToRemove, succ);
if (pred!=null) {
connect(pred, pos1.first, succ, pos2.second);
}
}
} else {
// Only have one input/output
Operator pred = null;
Pair pos1 = null;
if (predsCopy!=null) {
pred = predsCopy.get(0);
pos1 = disconnect(pred, operatorToRemove);
}
Operator succ = null;
Pair pos2 = null;
if (succsCopy!=null) {
succ = succsCopy.get(0);
pos2 = disconnect(operatorToRemove, succ);
}
if (pred!=null && succ!=null) {
connect(pred, pos1.first, succ, pos2.second);
}
}
remove(operatorToRemove);
}
@Override
public void insertBetween(Operator pred, Operator operatorToInsert, Operator succ) throws FrontendException {
add(operatorToInsert);
Pair pos = disconnect(pred, succ);
connect(pred, pos.first, operatorToInsert, 0);
connect(operatorToInsert, 0, succ, pos.second);
}
/**
* A method to check if there is a path from a given node to another node
* @param from the start node for checking
* @param to the end node for checking
* @return true if path exists, false otherwise
*/
public boolean pathExists(Operator from, Operator to) {
List successors = getSuccessors( from );
if(successors == null || successors.size() == 0) {
return false;
}
for (Operator successor : successors) {
if( successor.equals( to ) || pathExists( successor, to ) ) {
return true;
}
}
return false;
}
}
