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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.hadoop.hive.ql.optimizer.physical;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.exec.ConditionalTask;
import org.apache.hadoop.hive.ql.exec.MapJoinOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.SparkHashTableSinkOperator;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.exec.spark.SparkTask;
import org.apache.hadoop.hive.ql.lib.Dispatcher;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.lib.TaskGraphWalker;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.plan.BaseWork;
import org.apache.hadoop.hive.ql.plan.ConditionalResolver;
import org.apache.hadoop.hive.ql.plan.ConditionalResolverSkewJoin;
import org.apache.hadoop.hive.ql.plan.ConditionalWork;
import org.apache.hadoop.hive.ql.plan.BucketMapJoinContext;
import org.apache.hadoop.hive.ql.plan.MapJoinDesc;
import org.apache.hadoop.hive.ql.plan.MapWork;
import org.apache.hadoop.hive.ql.plan.MapredLocalWork;
import org.apache.hadoop.hive.ql.plan.OperatorDesc;
import org.apache.hadoop.hive.ql.plan.SparkBucketMapJoinContext;
import org.apache.hadoop.hive.ql.plan.SparkHashTableSinkDesc;
import org.apache.hadoop.hive.ql.plan.SparkWork;
public class SparkMapJoinResolver implements PhysicalPlanResolver {
// prevents a task from being processed multiple times
private final Set> visitedTasks = new HashSet<>();
@Override
public PhysicalContext resolve(PhysicalContext pctx) throws SemanticException {
Dispatcher dispatcher = new SparkMapJoinTaskDispatcher(pctx);
TaskGraphWalker graphWalker = new TaskGraphWalker(dispatcher);
ArrayList topNodes = new ArrayList();
topNodes.addAll(pctx.getRootTasks());
graphWalker.startWalking(topNodes, null);
return pctx;
}
// Check whether the specified BaseWork's operator tree contains a operator
// of the specified operator class
private boolean containsOp(BaseWork work, Class clazz) {
Set> matchingOps = getOp(work, clazz);
return matchingOps != null && !matchingOps.isEmpty();
}
private boolean containsOp(SparkWork sparkWork, Class clazz) {
for (BaseWork work : sparkWork.getAllWorkUnsorted()) {
if (containsOp(work, clazz)) {
return true;
}
}
return false;
}
public static Set> getOp(BaseWork work, Class clazz) {
Set> ops = new HashSet>();
if (work instanceof MapWork) {
Collection> opSet = ((MapWork) work).getAliasToWork().values();
Stack> opStack = new Stack>();
opStack.addAll(opSet);
while (!opStack.empty()) {
Operator op = opStack.pop();
ops.add(op);
if (op.getChildOperators() != null) {
opStack.addAll(op.getChildOperators());
}
}
} else {
ops.addAll(work.getAllOperators());
}
Set> matchingOps =
new HashSet>();
for (Operator op : ops) {
if (clazz.isInstance(op)) {
matchingOps.add(op);
}
}
return matchingOps;
}
@SuppressWarnings("unchecked")
class SparkMapJoinTaskDispatcher implements Dispatcher {
private final PhysicalContext physicalContext;
// For each BaseWork with MJ operator, we build a SparkWork for its small table BaseWorks
// This map records such information
private final Map sparkWorkMap;
// SparkWork dependency graph - from a SparkWork with MJ operators to all
// of its parent SparkWorks for the small tables
private final Map> dependencyGraph;
public SparkMapJoinTaskDispatcher(PhysicalContext pc) {
super();
physicalContext = pc;
sparkWorkMap = new LinkedHashMap();
dependencyGraph = new LinkedHashMap>();
}
// Move the specified work from the sparkWork to the targetWork
// Note that, in order not to break the graph (since we need it for the edges),
// we don't remove the work from the sparkWork here. The removal is done later.
private void moveWork(SparkWork sparkWork, BaseWork work, SparkWork targetWork) {
List parentWorks = sparkWork.getParents(work);
if (sparkWork != targetWork) {
targetWork.add(work);
// If any child work for this work is already added to the targetWork earlier,
// we should connect this work with it
for (BaseWork childWork : sparkWork.getChildren(work)) {
if (targetWork.contains(childWork)) {
targetWork.connect(work, childWork, sparkWork.getEdgeProperty(work, childWork));
}
}
}
if (!containsOp(work, MapJoinOperator.class)) {
for (BaseWork parent : parentWorks) {
moveWork(sparkWork, parent, targetWork);
}
} else {
// Create a new SparkWork for all the small tables of this work
SparkWork parentWork =
new SparkWork(physicalContext.conf.getVar(HiveConf.ConfVars.HIVEQUERYID));
// copy cloneToWork to ensure RDD cache still works
parentWork.setCloneToWork(sparkWork.getCloneToWork());
dependencyGraph.get(targetWork).add(parentWork);
dependencyGraph.put(parentWork, new ArrayList());
// this work is now moved to the parentWork, thus we should
// update this information in sparkWorkMap
sparkWorkMap.put(work, parentWork);
for (BaseWork parent : parentWorks) {
if (containsOp(parent, SparkHashTableSinkOperator.class)) {
moveWork(sparkWork, parent, parentWork);
} else {
moveWork(sparkWork, parent, targetWork);
}
}
}
}
private void generateLocalWork(SparkTask originalTask) {
SparkWork originalWork = originalTask.getWork();
Collection allBaseWorks = originalWork.getAllWork();
Context ctx = physicalContext.getContext();
for (BaseWork work : allBaseWorks) {
if (work.getMapRedLocalWork() == null) {
if (containsOp(work, SparkHashTableSinkOperator.class) ||
containsOp(work, MapJoinOperator.class)) {
work.setMapRedLocalWork(new MapredLocalWork());
}
Set> ops = getOp(work, MapJoinOperator.class);
if (ops == null || ops.isEmpty()) {
continue;
}
Path tmpPath = Utilities.generateTmpPath(ctx.getMRTmpPath(), originalTask.getId());
MapredLocalWork bigTableLocalWork = work.getMapRedLocalWork();
List> dummyOps =
new ArrayList>(work.getDummyOps());
bigTableLocalWork.setDummyParentOp(dummyOps);
bigTableLocalWork.setTmpPath(tmpPath);
// In one work, only one map join operator can be bucketed
SparkBucketMapJoinContext bucketMJCxt = null;
for (Operator op : ops) {
MapJoinOperator mapJoinOp = (MapJoinOperator) op;
MapJoinDesc mapJoinDesc = mapJoinOp.getConf();
if (mapJoinDesc.isBucketMapJoin()) {
bucketMJCxt = new SparkBucketMapJoinContext(mapJoinDesc);
bucketMJCxt.setBucketMatcherClass(
org.apache.hadoop.hive.ql.exec.DefaultBucketMatcher.class);
bucketMJCxt.setPosToAliasMap(mapJoinOp.getPosToAliasMap());
((MapWork) work).setUseBucketizedHiveInputFormat(true);
bigTableLocalWork.setBucketMapjoinContext(bucketMJCxt);
bigTableLocalWork.setInputFileChangeSensitive(true);
break;
}
}
for (BaseWork parentWork : originalWork.getParents(work)) {
Set> hashTableSinkOps =
getOp(parentWork, SparkHashTableSinkOperator.class);
if (hashTableSinkOps == null || hashTableSinkOps.isEmpty()) {
continue;
}
MapredLocalWork parentLocalWork = parentWork.getMapRedLocalWork();
parentLocalWork.setTmpHDFSPath(tmpPath);
if (bucketMJCxt != null) {
// We only need to update the work with the hashtable
// sink operator with the same mapjoin desc. We can tell
// that by comparing the bucket file name mapping map
// instance. They should be exactly the same one due to
// the way how the bucket mapjoin context is constructed.
for (Operator op : hashTableSinkOps) {
SparkHashTableSinkOperator hashTableSinkOp = (SparkHashTableSinkOperator) op;
SparkHashTableSinkDesc hashTableSinkDesc = hashTableSinkOp.getConf();
BucketMapJoinContext original = hashTableSinkDesc.getBucketMapjoinContext();
if (original != null && original.getBucketFileNameMapping()
== bucketMJCxt.getBucketFileNameMapping()) {
((MapWork) parentWork).setUseBucketizedHiveInputFormat(true);
parentLocalWork.setBucketMapjoinContext(bucketMJCxt);
parentLocalWork.setInputFileChangeSensitive(true);
break;
}
}
}
}
}
}
}
// Create a new SparkTask for the specified SparkWork, recursively compute
// all the parent SparkTasks that this new task is depend on, if they don't already exists.
private SparkTask createSparkTask(SparkTask originalTask,
SparkWork sparkWork,
Map createdTaskMap,
ConditionalTask conditionalTask) {
if (createdTaskMap.containsKey(sparkWork)) {
return createdTaskMap.get(sparkWork);
}
SparkTask resultTask = originalTask.getWork() == sparkWork ?
originalTask : (SparkTask) TaskFactory.get(sparkWork, physicalContext.conf);
if (!dependencyGraph.get(sparkWork).isEmpty()) {
for (SparkWork parentWork : dependencyGraph.get(sparkWork)) {
SparkTask parentTask =
createSparkTask(originalTask, parentWork, createdTaskMap, conditionalTask);
parentTask.addDependentTask(resultTask);
}
} else {
if (originalTask != resultTask) {
List> parentTasks = originalTask.getParentTasks();
if (parentTasks != null && parentTasks.size() > 0) {
// avoid concurrent modification
originalTask.setParentTasks(new ArrayList>());
for (Task parentTask : parentTasks) {
parentTask.addDependentTask(resultTask);
parentTask.removeDependentTask(originalTask);
}
} else {
if (conditionalTask == null) {
physicalContext.addToRootTask(resultTask);
physicalContext.removeFromRootTask(originalTask);
} else {
updateConditionalTask(conditionalTask, originalTask, resultTask);
}
}
}
}
createdTaskMap.put(sparkWork, resultTask);
return resultTask;
}
@Override
public Object dispatch(Node nd, Stack stack, Object... nos)
throws SemanticException {
Task currentTask = (Task) nd;
if(currentTask.isMapRedTask()) {
if (currentTask instanceof ConditionalTask) {
List> taskList =
((ConditionalTask) currentTask).getListTasks();
for (Task tsk : taskList) {
if (tsk instanceof SparkTask) {
processCurrentTask((SparkTask) tsk, (ConditionalTask) currentTask);
visitedTasks.add(tsk);
}
}
} else if (currentTask instanceof SparkTask) {
processCurrentTask((SparkTask) currentTask, null);
visitedTasks.add(currentTask);
}
}
return null;
}
/**
* @param sparkTask The current spark task we're processing.
* @param conditionalTask If conditional task is not null, it means the current task is
* wrapped in its task list.
*/
private void processCurrentTask(SparkTask sparkTask, ConditionalTask conditionalTask) {
SparkWork sparkWork = sparkTask.getWork();
if (!visitedTasks.contains(sparkTask)) {
dependencyGraph.clear();
sparkWorkMap.clear();
// Generate MapredLocalWorks for MJ and HTS
generateLocalWork(sparkTask);
dependencyGraph.put(sparkWork, new ArrayList());
Set leaves = sparkWork.getLeaves();
for (BaseWork leaf : leaves) {
moveWork(sparkWork, leaf, sparkWork);
}
// Now remove all BaseWorks in all the childSparkWorks that we created
// from the original SparkWork
for (SparkWork newSparkWork : sparkWorkMap.values()) {
for (BaseWork work : newSparkWork.getAllWorkUnsorted()) {
sparkWork.remove(work);
}
}
Map createdTaskMap = new LinkedHashMap();
// Now create SparkTasks from the SparkWorks, also set up dependency
for (SparkWork work : dependencyGraph.keySet()) {
createSparkTask(sparkTask, work, createdTaskMap, conditionalTask);
}
} else if (conditionalTask != null) {
// We may need to update the conditional task's list. This happens when a common map join
// task exists in the task list and has already been processed. In such a case,
// the current task is the map join task and we need to replace it with
// its parent, i.e. the small table task.
if (sparkTask.getParentTasks() != null && sparkTask.getParentTasks().size() == 1 &&
sparkTask.getParentTasks().get(0) instanceof SparkTask) {
SparkTask parent = (SparkTask) sparkTask.getParentTasks().get(0);
if (containsOp(sparkWork, MapJoinOperator.class) &&
containsOp(parent.getWork(), SparkHashTableSinkOperator.class)) {
updateConditionalTask(conditionalTask, sparkTask, parent);
}
}
}
}
/**
* Update the task/work list of this conditional task to replace originalTask with newTask.
* For runtime skew join, also update dirToTaskMap for the conditional resolver
*/
private void updateConditionalTask(ConditionalTask conditionalTask,
SparkTask originalTask, SparkTask newTask) {
ConditionalWork conditionalWork = conditionalTask.getWork();
SparkWork originWork = originalTask.getWork();
SparkWork newWork = newTask.getWork();
List> listTask = conditionalTask.getListTasks();
List listWork = (List) conditionalWork.getListWorks();
int taskIndex = listTask.indexOf(originalTask);
int workIndex = listWork.indexOf(originWork);
if (taskIndex < 0 || workIndex < 0) {
return;
}
listTask.set(taskIndex, newTask);
listWork.set(workIndex, newWork);
ConditionalResolver resolver = conditionalTask.getResolver();
if (resolver instanceof ConditionalResolverSkewJoin) {
// get bigKeysDirToTaskMap
ConditionalResolverSkewJoin.ConditionalResolverSkewJoinCtx context =
(ConditionalResolverSkewJoin.ConditionalResolverSkewJoinCtx) conditionalTask
.getResolverCtx();
HashMap> bigKeysDirToTaskMap = context
.getDirToTaskMap();
// to avoid concurrent modify the hashmap
HashMap> newbigKeysDirToTaskMap =
new HashMap>();
// reset the resolver
for (Map.Entry> entry :
bigKeysDirToTaskMap.entrySet()) {
Task task = entry.getValue();
Path bigKeyDir = entry.getKey();
if (task.equals(originalTask)) {
newbigKeysDirToTaskMap.put(bigKeyDir, newTask);
} else {
newbigKeysDirToTaskMap.put(bigKeyDir, task);
}
}
context.setDirToTaskMap(newbigKeysDirToTaskMap);
// update no skew task
if (context.getNoSkewTask() != null && context.getNoSkewTask().equals(originalTask)) {
context.setNoSkewTask(newTask);
}
}
}
}
}
