com.tuplejump.calliope.server.CalliopeSQLEnv.scala 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 com.tuplejump.calliope.server

import org.apache.hadoop.hive.ql.session.SessionState
import org.apache.spark.scheduler.StatsReportListener
import org.apache.spark.sql.hive.CassandraAwareHiveContext
import org.apache.spark.{Logging, SparkConf, SparkContext}

/** A singleton object for the master program. The slaves should not access this. */
object CalliopeSQLEnv extends Logging {
  logDebug("Initializing CalliopeSQLEnv")

  var hiveContext: CassandraAwareHiveContext = _
  var sparkContext: SparkContext = _

  def init() {
    if (hiveContext == null) {
      sparkContext = new SparkContext(new SparkConf()
        .setAppName(s"CalliopeSQL::${java.net.InetAddress.getLocalHost.getHostName}"))

      sparkContext.addSparkListener(new StatsReportListener())

      hiveContext = new CassandraAwareHiveContext(sparkContext) {
        @transient override lazy val sessionState = SessionState.get()
        @transient override lazy val hiveconf = sessionState.getConf
      }
    }
  }

  /** Cleans up and shuts down the Spark SQL environments. */
  def stop() {
    logDebug("Shutting down Calliope SQL Environment")
    // Stop the SparkContext
    if (CalliopeSQLEnv.sparkContext != null) {
      sparkContext.stop()
      sparkContext = null
      hiveContext = null
    }
  }
}