Cloud Computing——Everything as a Service

service classification

有 IaaS, PaaS, SaaS

HDFS

Summary ☞:

• HDFS can not cope with the scene

1. Not low latency
2. Small file storage space utilization problems exist
3. Files can not be modified

Three copies of what role

1. Prevent single failures, increase availability
2. Ram to prevent a large number of links to live on a machine, network bandwidth utilization