Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/18555#discussion_r126315856
--- Diff:
core/src/main/scala/org/apache/spark/internal/config/package.scala ---
@@ -259,6 +344,7 @@ package object config {
" over estimate, then the partitions with small files will be faster
than partitions with" +
" bigger files.")
.longConf
+ .checkValue(_ > 0, "The number of CostInBytes event queue must not be
negative")
--- End diff --
Since `_ > 0`, we should avoid 0, too.
`must not be negative` => `must be positive`.
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