steveloughran commented on a change in pull request #33064:
URL: https://github.com/apache/spark/pull/33064#discussion_r658771425



##########
File path: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
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@@ -487,6 +490,18 @@ private[spark] object SparkHadoopUtil extends Logging {
     if 
(conf.getOption("spark.hadoop.fs.s3a.downgrade.syncable.exceptions").isEmpty) {
       hadoopConf.set("fs.s3a.downgrade.syncable.exceptions", "true")
     }
+    // In Hadoop 3.3.1, AWS region handling with the default "" endpoint only 
works
+    // in EC2 deployments or when the AWS CLI is installed.
+    // The workaround is to set the name of the S3 endpoint explicitly,

Review comment:
       that's automatically picked up in the default chain, but since you have 
to set it everywhere it's not something you can rely on. 




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