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ZeppelinR.scala
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ZeppelinR.scala
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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.zeppelin.spark
import org.apache.spark.SparkRBackend
import org.ddahl.rscala.callback._
object ZeppelinR {
private val R = RClient()
def open(master: String = "local[*]", sparkHome: String = "/opt/spark", sparkInterpreter: SparkInterpreter): Unit = {
eval(
s"""
|Sys.setenv(SPARK_HOME="$sparkHome")
|.libPaths(c(file.path(Sys.getenv("SPARK_HOME"), "R", "lib"), .libPaths()))
|library(SparkR)
""".stripMargin
)
// See ./core/src/main/scala/org/apache/spark/deploy/RRunner.scala for RBackend usage
val port = SparkRBackend.init()
SparkRBackend.start()
eval(
s"""
|SparkR:::connectBackend("localhost", ${port})
|""".stripMargin)
// scStartTime is needed by R/pkg/R/sparkR.R
eval(
"""
|assign(".scStartTime", as.integer(Sys.time()), envir = SparkR:::.sparkREnv)
""".stripMargin)
ZeppelinRContext.setSparkContext(sparkInterpreter.getSparkContext())
eval(
"""
|assign(".sc", SparkR:::callJStatic("org.apache.zeppelin.spark.ZeppelinRContext", "getSparkContext"), envir = SparkR:::.sparkREnv)
|""".stripMargin)
eval(
"""
|assign("sc", get(".sc", envir = SparkR:::.sparkREnv), envir=.GlobalEnv)
""".stripMargin)
ZeppelinRContext.setSqlContext(sparkInterpreter.getSQLContext())
eval(
"""
|assign(".sqlc", SparkR:::callJStatic("org.apache.zeppelin.spark.ZeppelinRContext", "getSqlContext"), envir = SparkR:::.sparkREnv)
|""".stripMargin)
eval(
"""
|assign("sqlContext", get(".sqlc", envir = SparkR:::.sparkREnv), envir = .GlobalEnv)
|""".stripMargin)
ZeppelinRContext.setZepplinContext(sparkInterpreter.getZeppelinContext())
eval(
"""
|assign(".zeppelinContext", SparkR:::callJStatic("org.apache.zeppelin.spark.ZeppelinRContext", "getZeppelinContext"), envir = .GlobalEnv)
|""".stripMargin
)
eval(
"""
|z.put <- function(name, object) {
| SparkR:::callJMethod(.zeppelinContext, "put", name, object)
|}
|z.get <- function(name) {
| SparkR:::callJMethod(.zeppelinContext, "get", name)
|}
|""".stripMargin
)
eval(
"""
|library("knitr")
""".stripMargin)
}
def eval(command: String): Any = {
try {
R.eval(command)
} catch {
case e: Exception => throw new RuntimeException(e.getMessage + " - Given R command=" + command)
}
}
def set(key: String, value: AnyRef): Unit = {
R.set(key, value)
}
def get(key: String): Any = {
R.get(key)._1
}
def getS0(key: String): String = {
R.getS0(key)
}
def close():Unit = {
R.eval("""
|sparkR.stop()
""".stripMargin
)
}
}