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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.
#
# Client code to connect to SparkRBackend
# Creates a SparkR client connection object
# if one doesn't already exist
connectBackend <- function(hostname, port, timeout = 6000) {
if (exists(".sparkRcon", envir = .sparkREnv)) {
if (isOpen(.sparkREnv[[".sparkRCon"]])) {
cat("SparkRBackend client connection already exists\n")
return(get(".sparkRcon", envir = .sparkREnv))
}
}
con <- socketConnection(host = hostname, port = port, server = FALSE,
blocking = TRUE, open = "wb", timeout = timeout)
assign(".sparkRCon", con, envir = .sparkREnv)
con
}
determineSparkSubmitBin <- function() {
if (.Platform$OS.type == "unix") {
sparkSubmitBinName <- "spark-submit"
} else {
sparkSubmitBinName <- "spark-submit.cmd"
}
sparkSubmitBinName
}
generateSparkSubmitArgs <- function(args, sparkHome, jars, sparkSubmitOpts, packages) {
jars <- paste0(jars, collapse = ",")
if (jars != "") {
# construct the jars argument with a space between --jars and comma-separated values
jars <- paste0("--jars ", jars)
}
packages <- paste0(packages, collapse = ",")
if (packages != "") {
# construct the packages argument with a space between --packages and comma-separated values
packages <- paste0("--packages ", packages)
}
combinedArgs <- paste(jars, packages, sparkSubmitOpts, args, sep = " ")
combinedArgs
}
launchBackend <- function(args, sparkHome, jars, sparkSubmitOpts, packages) {
sparkSubmitBinName <- determineSparkSubmitBin()
if (sparkHome != "") {
sparkSubmitBin <- file.path(sparkHome, "bin", sparkSubmitBinName)
} else {
sparkSubmitBin <- sparkSubmitBinName
}
combinedArgs <- generateSparkSubmitArgs(args, sparkHome, jars, sparkSubmitOpts, packages)
cat("Launching java with spark-submit command", sparkSubmitBin, combinedArgs, "\n")
invisible(system2(sparkSubmitBin, combinedArgs, wait = F))
}
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