About HDFS
HDFS is a Java-based file system that provides scalable and reliable data storage, and it was designed to span large clusters of commodity servers. HDFS has demonstrated production scalability of up to 200 PB of storage and a single cluster of 4500 servers, supporting close to a billion files and blocks.
About Amazon Redshift
Ingest to Redshift using ETL or CDC. Extract from Redshift and load to other destinations.