Github user jerryshao commented on a diff in the pull request: https://github.com/apache/spark/pull/21474#discussion_r204021872 --- Diff: core/src/main/scala/org/apache/spark/internal/config/package.scala --- @@ -429,7 +429,11 @@ package object config { "external shuffle service, this feature can only be worked when external shuffle" + "service is newer than Spark 2.2.") .bytesConf(ByteUnit.BYTE) - .createWithDefault(Long.MaxValue) --- End diff -- I think the original purpose to set to `Long.MaxValue` is to avoid using this configuration by default, user should set to a proper size to enable this feature. But anyway I think the current change is also fine.
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