The fact that s3:// was broken in Hadoop 2.7 and nobody noticed until now shows that it's not being used. while invaluable at the time, s3n and especially s3a render it obsolete except for reading existing data.
HADOOP-12709 cuts the s3:// from trunk branch, and this JIRA ticket is to deprecate it from branch-2.
- Mark Java source as @deprecated
- Warn the first time in a JVM that an S3 instance is created, "deprecated -will be removed in future releases"
Thanks Steve Loughran for the proposal.