jeremyjliu commented on a change in pull request #24811: [SPARK-27962][R][CORE]
Propagate subprocess stdout in deploy.RRunner in exception
URL: https://github.com/apache/spark/pull/24811#discussion_r293177686
##########
File path: core/src/main/scala/org/apache/spark/deploy/RRunner.scala
##########
@@ -100,15 +100,17 @@ object RRunner {
builder.redirectErrorStream(true) // Ugly but needed for stdout and
stderr to synchronize
val process = builder.start()
- new RedirectThread(process.getInputStream, System.out, "redirect R
output").start()
+ val stdoutBuffer = new CircularBuffer(1024)
+ val output = new TeeOutputStream(System.out, stdoutBuffer)
+ new RedirectThread(process.getInputStream, output, "redirect R
output").start()
- process.waitFor()
+ val returnCode = process.waitFor()
+ if (returnCode != 0) {
+ throw SparkUserAppException(returnCode,
Option(stdoutBuffer.toString))
+ }
} finally {
sparkRBackend.close()
}
- if (returnCode != 0) {
Review comment:
Before (stacktrace truncated):
```
org.apache.spark.SparkUserAppException: User application exited with exit
code 127
```
And after:
```
org.apache.spark.SparkUserAppException: User application exited with exit
code 127 and message /<path-to-R>/R: error while loading shared libraries:
libiconv.so.2: cannot open shared object file: No such file or directory
```
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