56 lines
1.9 KiB
R
56 lines
1.9 KiB
R
#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Worker daemon
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rLibDir <- Sys.getenv("SPARKR_RLIBDIR")
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connectionTimeout <- as.integer(Sys.getenv("SPARKR_BACKEND_CONNECTION_TIMEOUT", "6000"))
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dirs <- strsplit(rLibDir, ",")[[1]]
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script <- file.path(dirs[[1]], "SparkR", "worker", "worker.R")
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# preload SparkR package, speedup worker
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.libPaths(c(dirs, .libPaths()))
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suppressPackageStartupMessages(library(SparkR))
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port <- as.integer(Sys.getenv("SPARKR_WORKER_PORT"))
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inputCon <- socketConnection(
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port = port, open = "rb", blocking = TRUE, timeout = connectionTimeout)
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while (TRUE) {
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ready <- socketSelect(list(inputCon))
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if (ready) {
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port <- SparkR:::readInt(inputCon)
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# There is a small chance that it could be interrupted by signal, retry one time
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if (length(port) == 0) {
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port <- SparkR:::readInt(inputCon)
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if (length(port) == 0) {
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cat("quitting daemon\n")
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quit(save = "no")
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}
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}
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p <- parallel:::mcfork()
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if (inherits(p, "masterProcess")) {
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close(inputCon)
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Sys.setenv(SPARKR_WORKER_PORT = port)
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try(source(script))
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# Set SIGUSR1 so that child can exit
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tools::pskill(Sys.getpid(), tools::SIGUSR1)
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parallel:::mcexit(0L)
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}
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}
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}
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