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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.hive
import org.apache.spark.SparkContext
import org.apache.spark.sql.hive.client.{HiveClient, HiveClientImpl}
import org.apache.spark.sql.internal.SharedState
/**
* A class that holds all state shared across sessions in a given
* [[org.apache.spark.sql.SparkSession]] backed by Hive.
*/
private[hive] class HiveSharedState(override val sparkContext: SparkContext)
extends SharedState(sparkContext) {
// TODO: just share the IsolatedClientLoader instead of the client instances themselves
/**
* A Hive client used for execution.
*/
val executionHive: HiveClientImpl = {
HiveUtils.newClientForExecution(sparkContext.conf, sparkContext.hadoopConfiguration)
}
/**
* A Hive client used to interact with the metastore.
*/
// This needs to be a lazy val at here because TestHiveSharedState is overriding it.
lazy val metadataHive: HiveClient = {
HiveUtils.newClientForMetadata(sparkContext.conf, sparkContext.hadoopConfiguration)
}
/**
* A catalog that interacts with the Hive metastore.
*/
override lazy val externalCatalog = new HiveExternalCatalog(metadataHive)
}
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