Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5551#discussion_r28577520
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ClientArguments.scala ---
@@ -103,9 +103,14 @@ private[spark] class ClientArguments(args:
Array[String], sparkConf: SparkConf)
* This is intended to be called only after the provided arguments have
been parsed.
*/
private def validateArgs(): Unit = {
- if (numExecutors <= 0) {
+ if (numExecutors < 0 || (!isDynamicAllocationEnabled && numExecutors
== 0)) {
throw new IllegalArgumentException(
- "You must specify at least 1 executor!\n" + getUsageMessage())
+ s"""
+ |Number of executors $numExecutors is not legal.
+ |If dynamic allocation is enable, number of executors should at
least be 0.
--- End diff --
enabled -> enabled. I think this is simpler to state as "Number of
executors was $numExecutors, but must be at least 1 (or 0 if dynamic executor
allocation is enabled)."
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