title: Apache flink with S3 as source and S3 as sink
body: <p>Is it possible to read events as they land in S3 source bucket via apache Flink and process and sink it back to some other S3 bucket? Is there a special connector for that , or I have to use the available read/save examples mentioned in Apache Flink?
  How does the checkpointing happen in such case, does flink keep track of what it has read from S3 source bucket automatically, or does it need custom code to be built. Does flink also guarentee exactly once processing in S3 source case.</p>