Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/15370#discussion_r82386685
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -71,6 +72,11 @@ private[spark] object CallSite {
private[spark] object Utils extends Logging {
val random = new Random()
+ // Use a common file numbering format which defaults to 5 digits for
saving various part files.
+ val numFormatter = NumberFormat.getIntegerInstance()
--- End diff --
If this is used by multiple different classes for formatting the number if
seems fine to be in Utils. How about instead we have a function in here that is
formatPartitionNumber(int id) which internally uses the number formatter?
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