Currently clients of the library won't know if SEND_SYNC_RECORDS is successful or not and they rely on results of SQS in preparing response of GET_EXISTING_OBJECTS to acknowledge that the previous sent record is successfully uploaded to s3. It is easy for client not to get this ack and leads to resend forever.
So we should acknowledge the result by callback of s3 PUT
Currently clients of the library won't know if SEND_SYNC_RECORDS is successful or not and they rely on results of SQS in preparing response of
GET_EXISTING_OBJECTSto acknowledge that the previous sent record is successfully uploaded to s3. It is easy for client not to get this ack and leads to resend forever. So we should acknowledge the result by callback of s3 PUT