Introduction to Hdfs | Hadoop Tutorial | Edureka

Hadoop Distributed File System (HDFS) is a system that runs on commodity hardware. It is highly fault-tolerant and could be deployed on low-cost hardware. To learn how it works and more, watch the video that covers the following topics:
1. What is HDFS?
2. Hadoop Server Roles
3. HDFS Architecture
4. MapReduce Job execution
5. Anatomy of a File Write and Read
6. Rack Awareness
7. Hadoop Installation
8. Hadoop Configuration Files
9. Hadoop Cluster Modes
10. Hadoop Cluster Architecture
11. Hadoop Multi-Node Cluster Installation
12. Hadoop Clients
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[amarnath]

could you conclude me whether client does contact with namenode in any context. or not ? As in the writiing a file figure it contacts to file system and that contacts to Namenode.