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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.api.r
import java.io.File
import java.util.Arrays
import org.apache.spark.{SparkEnv, SparkException}
private[spark] object RUtils {
/**
* Get the SparkR package path in the local spark distribution.
*/
def localSparkRPackagePath: Option[String] = {
val sparkHome = sys.env.get("SPARK_HOME").orElse(sys.props.get("spark.test.home"))
sparkHome.map(
Seq(_, "R", "lib").mkString(File.separator)
)
}
/**
* Get the SparkR package path in various deployment modes.
* This assumes that Spark properties `spark.master` and `spark.submit.deployMode`
* and environment variable `SPARK_HOME` are set.
*/
def sparkRPackagePath(isDriver: Boolean): String = {
val (master, deployMode) =
if (isDriver) {
(sys.props("spark.master"), sys.props("spark.submit.deployMode"))
} else {
val sparkConf = SparkEnv.get.conf
(sparkConf.get("spark.master"), sparkConf.get("spark.submit.deployMode"))
}
val isYarnCluster = master != null && master.contains("yarn") && deployMode == "cluster"
val isYarnClient = master != null && master.contains("yarn") && deployMode == "client"
// In YARN mode, the SparkR package is distributed as an archive symbolically
// linked to the "sparkr" file in the current directory. Note that this does not apply
// to the driver in client mode because it is run outside of the cluster.
if (isYarnCluster || (isYarnClient && !isDriver)) {
new File("sparkr").getAbsolutePath
} else {
// Otherwise, assume the package is local
// TODO: support this for Mesos
localSparkRPackagePath.getOrElse {
throw new SparkException("SPARK_HOME not set. Can't locate SparkR package.")
}
}
}
/** Check if R is installed before running tests that use R commands. */
def isRInstalled: Boolean = {
try {
val builder = new ProcessBuilder(Arrays.asList("R", "--version"))
builder.start().waitFor() == 0
} catch {
case e: Exception => false
}
}
}
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