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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.spark.sql.internal
import java.util.Locale
import scala.reflect.ClassTag
import scala.util.control.NonFatal
import org.apache.hadoop.conf.Configuration
import org.apache.spark.{SparkConf, SparkContext, SparkException}
import org.apache.spark.internal.Logging
import org.apache.spark.sql.{SparkSession, SQLContext}
import org.apache.spark.sql.catalyst.catalog._
import org.apache.spark.sql.execution.CacheManager
import org.apache.spark.sql.execution.ui.{SQLListener, SQLTab}
import org.apache.spark.sql.internal.StaticSQLConf._
import org.apache.spark.util.{MutableURLClassLoader, Utils}
/**
* A class that holds all state shared across sessions in a given [[SQLContext]].
*/
private[sql] class SharedState(val sparkContext: SparkContext) extends Logging {
// Load hive-site.xml into hadoopConf and determine the warehouse path we want to use, based on
// the config from both hive and Spark SQL. Finally set the warehouse config value to sparkConf.
val warehousePath: String = {
val configFile = Utils.getContextOrSparkClassLoader.getResource("hive-site.xml")
if (configFile != null) {
logInfo(s"loading hive config file: $configFile")
sparkContext.hadoopConfiguration.addResource(configFile)
}
// hive.metastore.warehouse.dir only stay in hadoopConf
sparkContext.conf.remove("hive.metastore.warehouse.dir")
// Set the Hive metastore warehouse path to the one we use
val hiveWarehouseDir = sparkContext.hadoopConfiguration.get("hive.metastore.warehouse.dir")
if (hiveWarehouseDir != null && !sparkContext.conf.contains(WAREHOUSE_PATH.key)) {
// If hive.metastore.warehouse.dir is set and spark.sql.warehouse.dir is not set,
// we will respect the value of hive.metastore.warehouse.dir.
sparkContext.conf.set(WAREHOUSE_PATH.key, hiveWarehouseDir)
logInfo(s"${WAREHOUSE_PATH.key} is not set, but hive.metastore.warehouse.dir " +
s"is set. Setting ${WAREHOUSE_PATH.key} to the value of " +
s"hive.metastore.warehouse.dir ('$hiveWarehouseDir').")
hiveWarehouseDir
} else {
// If spark.sql.warehouse.dir is set, we will override hive.metastore.warehouse.dir using
// the value of spark.sql.warehouse.dir.
// When neither spark.sql.warehouse.dir nor hive.metastore.warehouse.dir is set,
// we will set hive.metastore.warehouse.dir to the default value of spark.sql.warehouse.dir.
val sparkWarehouseDir = sparkContext.conf.get(WAREHOUSE_PATH)
logInfo(s"Setting hive.metastore.warehouse.dir ('$hiveWarehouseDir') to the value of " +
s"${WAREHOUSE_PATH.key} ('$sparkWarehouseDir').")
sparkContext.hadoopConfiguration.set("hive.metastore.warehouse.dir", sparkWarehouseDir)
sparkWarehouseDir
}
}
logInfo(s"Warehouse path is '$warehousePath'.")
/**
* Class for caching query results reused in future executions.
*/
val cacheManager: CacheManager = new CacheManager
/**
* A listener for SQL-specific [[org.apache.spark.scheduler.SparkListenerEvent]]s.
*/
val listener: SQLListener = createListenerAndUI(sparkContext)
/**
* A catalog that interacts with external systems.
*/
lazy val externalCatalog: ExternalCatalog =
SharedState.reflect[ExternalCatalog, SparkConf, Configuration](
SharedState.externalCatalogClassName(sparkContext.conf),
sparkContext.conf,
sparkContext.hadoopConfiguration)
// Create the default database if it doesn't exist.
{
val defaultDbDefinition = CatalogDatabase(
SessionCatalog.DEFAULT_DATABASE,
"default database",
CatalogUtils.stringToURI(warehousePath),
Map())
// Initialize default database if it doesn't exist
if (!externalCatalog.databaseExists(SessionCatalog.DEFAULT_DATABASE)) {
// There may be another Spark application creating default database at the same time, here we
// set `ignoreIfExists = true` to avoid `DatabaseAlreadyExists` exception.
externalCatalog.createDatabase(defaultDbDefinition, ignoreIfExists = true)
}
}
/**
* A manager for global temporary views.
*/
val globalTempViewManager: GlobalTempViewManager = {
// System preserved database should not exists in metastore. However it's hard to guarantee it
// for every session, because case-sensitivity differs. Here we always lowercase it to make our
// life easier.
val globalTempDB = sparkContext.conf.get(GLOBAL_TEMP_DATABASE).toLowerCase(Locale.ROOT)
if (externalCatalog.databaseExists(globalTempDB)) {
throw new SparkException(
s"$globalTempDB is a system preserved database, please rename your existing database " +
"to resolve the name conflict, or set a different value for " +
s"${GLOBAL_TEMP_DATABASE.key}, and launch your Spark application again.")
}
new GlobalTempViewManager(globalTempDB)
}
/**
* A classloader used to load all user-added jar.
*/
val jarClassLoader = new NonClosableMutableURLClassLoader(
org.apache.spark.util.Utils.getContextOrSparkClassLoader)
/**
* Create a SQLListener then add it into SparkContext, and create a SQLTab if there is SparkUI.
*/
private def createListenerAndUI(sc: SparkContext): SQLListener = {
if (SparkSession.sqlListener.get() == null) {
val listener = new SQLListener(sc.conf)
if (SparkSession.sqlListener.compareAndSet(null, listener)) {
sc.addSparkListener(listener)
sc.ui.foreach(new SQLTab(listener, _))
}
}
SparkSession.sqlListener.get()
}
}
object SharedState {
private val HIVE_EXTERNAL_CATALOG_CLASS_NAME = "org.apache.spark.sql.hive.HiveExternalCatalog"
private def externalCatalogClassName(conf: SparkConf): String = {
conf.get(CATALOG_IMPLEMENTATION) match {
case "hive" => HIVE_EXTERNAL_CATALOG_CLASS_NAME
case "in-memory" => classOf[InMemoryCatalog].getCanonicalName
}
}
/**
* Helper method to create an instance of [[T]] using a single-arg constructor that
* accepts an [[Arg1]] and an [[Arg2]].
*/
private def reflect[T, Arg1 <: AnyRef, Arg2 <: AnyRef](
className: String,
ctorArg1: Arg1,
ctorArg2: Arg2)(
implicit ctorArgTag1: ClassTag[Arg1],
ctorArgTag2: ClassTag[Arg2]): T = {
try {
val clazz = Utils.classForName(className)
val ctor = clazz.getDeclaredConstructor(ctorArgTag1.runtimeClass, ctorArgTag2.runtimeClass)
val args = Array[AnyRef](ctorArg1, ctorArg2)
ctor.newInstance(args: _*).asInstanceOf[T]
} catch {
case NonFatal(e) =>
throw new IllegalArgumentException(s"Error while instantiating '$className':", e)
}
}
}
/**
* URL class loader that exposes the `addURL` and `getURLs` methods in URLClassLoader.
* This class loader cannot be closed (its `close` method is a no-op).
*/
private[sql] class NonClosableMutableURLClassLoader(parent: ClassLoader)
extends MutableURLClassLoader(Array.empty, parent) {
override def close(): Unit = {}
}
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