[SPARK-12263][DOCS] IllegalStateException: Memory can't be 0 for SPARK_WORKER_MEMORY without unit

Updated the Worker Unit IllegalStateException message to indicate no values less than 1MB instead of 0 to help solve this.
Requesting review

Author: Neelesh Srinivas Salian <nsalian@cloudera.com>

Closes #10483 from nssalian/SPARK-12263.

1 files changed, 1 insertions, 1 deletions

diff --git a/core/src/main/scala/org/apache/spark/deploy/worker/WorkerArguments.scala b/core/src/main/scala/org/apache/spark/deploy/worker/WorkerArguments.scala
index 5181142c5f..de3c7cd265 100644
--- a/core/src/main/scala/org/apache/spark/deploy/worker/WorkerArguments.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/worker/WorkerArguments.scala
@@ -175,7 +175,7 @@ private[worker] class WorkerArguments(args: Array[String], conf: SparkConf) {
 
   def checkWorkerMemory(): Unit = {
     if (memory <= 0) {
-      val message = "Memory can't be 0, missing a M or G on the end of the memory specification?"
+      val message = "Memory is below 1MB, or missing a M/G at the end of the memory specification?"
       throw new IllegalStateException(message)
     }
   }