S3/S3A support

[Vijay Srinivasaraghavan]

Hello,
Per documentation 
(https://ci.apache.org/projects/flink/flink-docs-master/setup/aws.html), it 
looks like S3/S3A FS implementation is supported using standard Hadoop S3 FS 
client APIs.
In the absence of using standard HCFS and going with S3/S3A,
1) Are there any known limitations/issues? 
2) Does checkpoint/savepoint works properly?
Regards
Vijay