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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.parse;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.Warehouse;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.exec.ColumnStatsTask;
import org.apache.hadoop.hive.ql.exec.FetchTask;
import org.apache.hadoop.hive.ql.exec.StatsTask;
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.mr.ExecDriver;
import org.apache.hadoop.hive.ql.hooks.ReadEntity;
import org.apache.hadoop.hive.ql.hooks.WriteEntity;
import org.apache.hadoop.hive.ql.metadata.Hive;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.optimizer.GenMapRedUtils;
import org.apache.hadoop.hive.ql.plan.ColumnStatsDesc;
import org.apache.hadoop.hive.ql.plan.ColumnStatsWork;
import org.apache.hadoop.hive.ql.plan.CreateTableDesc;
import org.apache.hadoop.hive.ql.plan.DDLWork;
import org.apache.hadoop.hive.ql.plan.FetchWork;
import org.apache.hadoop.hive.ql.plan.LoadFileDesc;
import org.apache.hadoop.hive.ql.plan.LoadTableDesc;
import org.apache.hadoop.hive.ql.plan.MoveWork;
import org.apache.hadoop.hive.ql.plan.PlanUtils;
import org.apache.hadoop.hive.ql.plan.TableDesc;
import org.apache.hadoop.hive.ql.session.SessionState.LogHelper;
/**
* TaskCompiler is a the base class for classes that compile
* operator pipelines into tasks.
*/
public abstract class TaskCompiler {
protected final Log LOG = LogFactory.getLog(TaskCompiler.class);
protected Hive db;
protected LogHelper console;
protected HiveConf conf;
public void init(HiveConf conf, LogHelper console, Hive db) {
this.conf = conf;
this.db = db;
this.console = console;
}
@SuppressWarnings({"nls", "unchecked"})
public void compile(final ParseContext pCtx, final List> rootTasks,
final HashSet inputs, final HashSet outputs) throws SemanticException {
Context ctx = pCtx.getContext();
GlobalLimitCtx globalLimitCtx = pCtx.getGlobalLimitCtx();
QB qb = pCtx.getQB();
List> mvTask = new ArrayList>();
List loadTableWork = pCtx.getLoadTableWork();
List loadFileWork = pCtx.getLoadFileWork();
boolean isCStats = qb.isAnalyzeRewrite();
if (pCtx.getFetchTask() != null) {
return;
}
optimizeOperatorPlan(pCtx, inputs, outputs);
/*
* In case of a select, use a fetch task instead of a move task.
* If the select is from analyze table column rewrite, don't create a fetch task. Instead create
* a column stats task later.
*/
if (pCtx.getQB().getIsQuery() && !isCStats) {
if ((!loadTableWork.isEmpty()) || (loadFileWork.size() != 1)) {
throw new SemanticException(ErrorMsg.GENERIC_ERROR.getMsg());
}
LoadFileDesc loadFileDesc = loadFileWork.get(0);
String cols = loadFileDesc.getColumns();
String colTypes = loadFileDesc.getColumnTypes();
TableDesc resultTab = pCtx.getFetchTabledesc();
if (resultTab == null) {
String resFileFormat = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEQUERYRESULTFILEFORMAT);
resultTab = PlanUtils.getDefaultQueryOutputTableDesc(cols, colTypes, resFileFormat);
}
FetchWork fetch = new FetchWork(loadFileDesc.getSourcePath(),
resultTab, qb.getParseInfo().getOuterQueryLimit());
fetch.setSource(pCtx.getFetchSource());
fetch.setSink(pCtx.getFetchSink());
pCtx.setFetchTask((FetchTask) TaskFactory.get(fetch, conf));
// For the FetchTask, the limit optimization requires we fetch all the rows
// in memory and count how many rows we get. It's not practical if the
// limit factor is too big
int fetchLimit = HiveConf.getIntVar(conf, HiveConf.ConfVars.HIVELIMITOPTMAXFETCH);
if (globalLimitCtx.isEnable() && globalLimitCtx.getGlobalLimit() > fetchLimit) {
LOG.info("For FetchTask, LIMIT " + globalLimitCtx.getGlobalLimit() + " > " + fetchLimit
+ ". Doesn't qualify limit optimiztion.");
globalLimitCtx.disableOpt();
}
} else if (!isCStats) {
for (LoadTableDesc ltd : loadTableWork) {
Task tsk = TaskFactory.get(new MoveWork(null, null, ltd, null, false), conf);
mvTask.add(tsk);
// Check to see if we are stale'ing any indexes and auto-update them if we want
if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVEINDEXAUTOUPDATE)) {
IndexUpdater indexUpdater = new IndexUpdater(loadTableWork, inputs, conf);
try {
List> indexUpdateTasks = indexUpdater
.generateUpdateTasks();
for (Task updateTask : indexUpdateTasks) {
tsk.addDependentTask(updateTask);
}
} catch (HiveException e) {
console
.printInfo("WARNING: could not auto-update stale indexes, which are not in sync");
}
}
}
boolean oneLoadFile = true;
for (LoadFileDesc lfd : loadFileWork) {
if (qb.isCTAS()) {
assert (oneLoadFile); // should not have more than 1 load file for
// CTAS
// make the movetask's destination directory the table's destination.
Path location;
String loc = qb.getTableDesc().getLocation();
if (loc == null) {
// get the table's default location
Table dumpTable;
Path targetPath;
try {
dumpTable = db.newTable(qb.getTableDesc().getTableName());
if (!db.databaseExists(dumpTable.getDbName())) {
throw new SemanticException("ERROR: The database " + dumpTable.getDbName()
+ " does not exist.");
}
Warehouse wh = new Warehouse(conf);
targetPath = wh.getTablePath(db.getDatabase(dumpTable.getDbName()), dumpTable
.getTableName());
} catch (HiveException e) {
throw new SemanticException(e);
} catch (MetaException e) {
throw new SemanticException(e);
}
location = targetPath;
} else {
location = new Path(loc);
}
lfd.setTargetDir(location);
oneLoadFile = false;
}
mvTask.add(TaskFactory.get(new MoveWork(null, null, null, lfd, false), conf));
}
}
generateTaskTree(rootTasks, pCtx, mvTask, inputs, outputs);
/*
* If the query was the result of analyze table column compute statistics rewrite, create
* a column stats task instead of a fetch task to persist stats to the metastore.
*/
if (isCStats) {
genColumnStatsTask(qb, loadTableWork, loadFileWork, rootTasks);
}
// For each task, set the key descriptor for the reducer
for (Task rootTask : rootTasks) {
GenMapRedUtils.setKeyAndValueDescForTaskTree(rootTask);
}
// If a task contains an operator which instructs bucketizedhiveinputformat
// to be used, please do so
for (Task rootTask : rootTasks) {
setInputFormat(rootTask);
}
optimizeTaskPlan(rootTasks, pCtx, ctx);
decideExecMode(rootTasks, ctx, globalLimitCtx);
if (qb.isCTAS()) {
// generate a DDL task and make it a dependent task of the leaf
CreateTableDesc crtTblDesc = qb.getTableDesc();
crtTblDesc.validate(conf);
// Clear the output for CTAS since we don't need the output from the
// mapredWork, the
// DDLWork at the tail of the chain will have the output
outputs.clear();
Task crtTblTask = TaskFactory.get(new DDLWork(
inputs, outputs, crtTblDesc), conf);
// find all leaf tasks and make the DDLTask as a dependent task of all of
// them
HashSet> leaves = new LinkedHashSet>();
getLeafTasks(rootTasks, leaves);
assert (leaves.size() > 0);
for (Task task : leaves) {
if (task instanceof StatsTask) {
// StatsTask require table to already exist
for (Task parentOfStatsTask : task.getParentTasks()) {
parentOfStatsTask.addDependentTask(crtTblTask);
}
for (Task parentOfCrtTblTask : crtTblTask.getParentTasks()) {
parentOfCrtTblTask.removeDependentTask(task);
}
crtTblTask.addDependentTask(task);
} else {
task.addDependentTask(crtTblTask);
}
}
}
if (globalLimitCtx.isEnable() && pCtx.getFetchTask() != null) {
LOG.info("set least row check for FetchTask: " + globalLimitCtx.getGlobalLimit());
pCtx.getFetchTask().getWork().setLeastNumRows(globalLimitCtx.getGlobalLimit());
}
if (globalLimitCtx.isEnable() && globalLimitCtx.getLastReduceLimitDesc() != null) {
LOG.info("set least row check for LimitDesc: " + globalLimitCtx.getGlobalLimit());
globalLimitCtx.getLastReduceLimitDesc().setLeastRows(globalLimitCtx.getGlobalLimit());
List mrTasks = Utilities.getMRTasks(rootTasks);
for (ExecDriver tsk : mrTasks) {
tsk.setRetryCmdWhenFail(true);
}
}
}
/**
* A helper function to generate a column stats task on top of map-red task. The column stats
* task fetches from the output of the map-red task, constructs the column stats object and
* persists it to the metastore.
*
* This method generates a plan with a column stats task on top of map-red task and sets up the
* appropriate metadata to be used during execution.
*
* @param qb
*/
@SuppressWarnings("unchecked")
protected void genColumnStatsTask(QB qb, List loadTableWork,
List loadFileWork, List> rootTasks) {
QBParseInfo qbParseInfo = qb.getParseInfo();
ColumnStatsTask cStatsTask = null;
ColumnStatsWork cStatsWork = null;
FetchWork fetch = null;
String tableName = qbParseInfo.getTableName();
String partName = qbParseInfo.getPartName();
List colName = qbParseInfo.getColName();
List colType = qbParseInfo.getColType();
boolean isTblLevel = qbParseInfo.isTblLvl();
String cols = loadFileWork.get(0).getColumns();
String colTypes = loadFileWork.get(0).getColumnTypes();
String resFileFormat = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEQUERYRESULTFILEFORMAT);
TableDesc resultTab = PlanUtils.getDefaultQueryOutputTableDesc(cols, colTypes, resFileFormat);
fetch = new FetchWork(loadFileWork.get(0).getSourcePath(),
resultTab, qb.getParseInfo().getOuterQueryLimit());
ColumnStatsDesc cStatsDesc = new ColumnStatsDesc(tableName, partName,
colName, colType, isTblLevel);
cStatsWork = new ColumnStatsWork(fetch, cStatsDesc);
cStatsTask = (ColumnStatsTask) TaskFactory.get(cStatsWork, conf);
rootTasks.add(cStatsTask);
}
/**
* Find all leaf tasks of the list of root tasks.
*/
protected void getLeafTasks(List> rootTasks,
HashSet> leaves) {
for (Task root : rootTasks) {
getLeafTasks(root, leaves);
}
}
private void getLeafTasks(Task task,
HashSet> leaves) {
if (task.getDependentTasks() == null) {
if (!leaves.contains(task)) {
leaves.add(task);
}
} else {
getLeafTasks(task.getDependentTasks(), leaves);
}
}
/*
* Called to transform tasks into local tasks where possible/desirable
*/
protected abstract void decideExecMode(List> rootTasks, Context ctx,
GlobalLimitCtx globalLimitCtx) throws SemanticException;
/*
* Called at the beginning of the compile phase to have another chance to optimize the operator plan
*/
protected void optimizeOperatorPlan(ParseContext pCtxSet, Set inputs,
Set outputs) throws SemanticException {
}
/*
* Called after the tasks have been generated to run another round of optimization
*/
protected abstract void optimizeTaskPlan(List> rootTasks,
ParseContext pCtx, Context ctx) throws SemanticException;
/*
* Called to set the appropriate input format for tasks
*/
protected abstract void setInputFormat(Task rootTask);
/*
* Called to generate the taks tree from the parse context/operator tree
*/
protected abstract void generateTaskTree(List> rootTasks, ParseContext pCtx,
List> mvTask, Set inputs, Set outputs) throws SemanticException;
/**
* Create a clone of the parse context
*/
public ParseContext getParseContext(ParseContext pCtx, List> rootTasks) {
return new ParseContext(conf, pCtx.getQB(), pCtx.getParseTree(),
pCtx.getOpToPartPruner(), pCtx.getOpToPartList(), pCtx.getTopOps(),
pCtx.getTopSelOps(), pCtx.getOpParseCtx(), pCtx.getJoinContext(),
pCtx.getSmbMapJoinContext(), pCtx.getTopToTable(), pCtx.getTopToProps(),
pCtx.getFsopToTable(),
pCtx.getLoadTableWork(), pCtx.getLoadFileWork(), pCtx.getContext(),
pCtx.getIdToTableNameMap(), pCtx.getDestTableId(), pCtx.getUCtx(),
pCtx.getListMapJoinOpsNoReducer(), pCtx.getGroupOpToInputTables(),
pCtx.getPrunedPartitions(), pCtx.getOpToSamplePruner(), pCtx.getGlobalLimitCtx(),
pCtx.getNameToSplitSample(), pCtx.getSemanticInputs(), rootTasks,
pCtx.getOpToPartToSkewedPruner(), pCtx.getViewAliasToInput(),
pCtx.getReduceSinkOperatorsAddedByEnforceBucketingSorting(),
pCtx.getQueryProperties());
}
}
