Github user zjffdu commented on the issue:
https://github.com/apache/spark/pull/14639
@sun-rui I verified it works in yarn-client mode, also for shell mode
under yarn-client. As spark won't be downloaded as long as spark_home exists
```
if (!is_sparkR_shell() && deployMode != "cluster") {
if (is.na(file.info(sparkHome)$isdir)) {
msg <- paste0("Spark not found in SPARK_HOME: ",
sparkHome,
" .\nTo search in the cache directory. ",
"Installation will start if not found.")
message(msg)
packageLocalDir <- install.spark()
sparkHome <- packageLocalDir
} else {
msg <- paste0("Spark package is found in SPARK_HOME: ", sparkHome)
message(msg)
cat(msg)
}
}
```
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