Amazon Virtual Public Cloud (VPC) is introducing three new features to make it faster, easier and more cost efficient to store and run analytics on your Amazon VPC Flow Logs. First, VPC Flow Logs can now be delivered to Amazon S3 in the Apache Parquet file format. Second, they can be stored in S3 with Hive-compatible prefixes. And third, your VPC Flow Logs can be delivered as hourly partitioned files. All of these features are available when you choose S3 as the destination for your VPC Flow Logs.
Source:: Amazon AWS