Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/21476#discussion_r192476723 --- Diff: resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala --- @@ -1485,6 +1486,22 @@ private object Client extends Logging { YarnAppReport(report.getYarnApplicationState(), report.getFinalApplicationStatus(), diagsOpt) } + /** + * Create a properly quoted library path string to be added as a prefix to the command executed by + * YARN. This is different from plain quoting due to YARN executing the command through "bash -c". + */ + def createLibraryPathPrefix(libpath: String, conf: SparkConf): String = { --- End diff -- This is so specific to the way YARN runs things that I don't think it would be useful anywhere else. If at some point it becomes useful, the code can be moved. I think the tests I added are better than just unit testing this function, since that way the code is actually being run through YARN and bash.
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