org.apache.hadoop.hive.ql.exec.spark.session.SparkSession Maven / Gradle / Ivy
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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.exec.spark.session;
import org.apache.hadoop.hive.common.ObjectPair;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.DriverContext;
import org.apache.hadoop.hive.ql.exec.spark.status.SparkJobRef;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.SparkWork;
public interface SparkSession {
/**
* Initializes a Spark session for DAG execution.
* @param conf Hive configuration.
*/
void open(HiveConf conf) throws HiveException;
/**
* Submit given sparkWork to SparkClient.
* @param driverContext
* @param sparkWork
* @return SparkJobRef
*/
SparkJobRef submit(DriverContext driverContext, SparkWork sparkWork) throws Exception;
/**
* Get Spark shuffle memory per task, and total number of cores. This
* information can be used to estimate how many reducers a task can have.
*
* @return an object pair, the first element is the shuffle memory per task in bytes,
* the second element is the number of total cores usable by the client
*/
ObjectPair getMemoryAndCores() throws Exception;
/**
* @return true if the session is open and ready to submit jobs.
*/
boolean isOpen();
/**
* @return configuration.
*/
HiveConf getConf();
/**
* @return session id.
*/
String getSessionId();
/**
* Close session and release resources.
*/
void close();
}