AWS, BIG DATA, JAVA

Amazon Aurora allows creating up 15 read replicas in a region. Read replicas share the source storage. Storage scales automatically into 10GB increments up to 64 TB. There is option for Global Database which allows single database to span across multiple regions.  It uses storage based replication. By default Aurora database is replicated six ways across three AZs. It can handle loss of two copies without affecting writes and three copies without affecting reads. Aurora also has a backtrack feature, it can go back to point in time without restore from a backup. 

For every domain which you want to manage, you need to create a hosted zone. Within Hosted zone , you can configure various record sets which specify how traffic within that domain will be routed. There are various types of records.  Typically A record points to an IP address or is an alias to another endpoint or record within same hosted zone.    CNAME record is slightly different. CNAME can point to another  domain or sub-domain ( not IP address ) . You can not create  CNAME for zone -apex (or  hosted zone itself).  A CNAME record can redirect DNS queries to any DNS record. A few important differences between CNAME and aliases are listed on below link. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html