Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18555#discussion_r165838720
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -231,6 +315,9 @@ package object config {
private[spark] val BLOCK_MANAGER_PORT =
ConfigBuilder("spark.blockManager.port")
.doc("Port to use for the block manager when a more specific setting
is not provided.")
.intConf
+ .checkValue(v => v == 0 || (1024 <= v && v < 65536),
--- End diff --
+1 on ^
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