Github user sun-rui commented on a diff in the pull request: https://github.com/apache/spark/pull/6743#discussion_r33539511 --- Diff: core/src/main/scala/org/apache/spark/api/r/RUtils.scala --- @@ -0,0 +1,44 @@ +/* + * 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 org.apache.spark.SparkException + +private[spark] object RUtils { + /** + * Get the SparkR package path in various deployment modes. + */ + def sparkRPackagePath(driver: Boolean): String = { + val yarnMode = sys.env.get("SPARK_YARN_MODE") + if (!yarnMode.isEmpty && yarnMode.get == "true" && + !(driver && System.getProperty("spark.master") == "yarn-client")) { --- End diff -- The intention is that: driver at yarn cluster mode -> get sparkR package from current directory driver at yarn client mode -> get sparkR package from $SPARK_HOME/R/lib worker at yarn cluster mode -> get sparkR package from current directory worker at yarn client mode -> get sparkR package from current directory I can add comments to make it easy to be read.
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