Introduction to Distributed System

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The video is a lecture on Chapter 14, 'Distributed Systems,' from a computer science course. The instructor begins by introducing the chapter's topics, which include types of network-based operating systems, network and communication structures, protocols, robustness, design issues, and distributed file systems. The lecture then transitions to a formal definition of a distributed system, stating it is a collection of loosely coupled processors interconnected by a communications network. The instructor explains that these processors are also referred to as nodes, computers, machines, or hosts, and that a 'site' is the location of a processor. A key concept introduced is the client-server model, where a server provides a resource and a client at a different site requests it. To illustrate this, the instructor draws a diagram showing a server at site A, a client at site B, and a network connecting them, with communication flowing from the client to the server to access resources.

Chapters

1. 0:00 – 2:00 00:00-02:00

   The video opens on a PDF document titled 'Chapter-14 Distributed Systems'. The instructor begins by outlining the topics for the chapter, which are listed on the page: Types of Network based Operating Systems, Network Structure, Communication Structure and Protocols, Robustness, Design Issues, and Distributed File Systems. The instructor then starts to write on the screen, adding handwritten notes such as 'Distributed System' and 'Types -> Multiprocessing' to the document, setting the stage for the lecture's content.

2. 2:00 – 4:44 02:00-04:44

   The instructor continues the lecture by defining a distributed system as a collection of loosely coupled processors interconnected by a communications network. The on-screen text is highlighted to emphasize this definition. The instructor explains that processors are also called nodes, computers, machines, or hosts, and that a 'site' is the location of a processor. The lecture then introduces the client-server model, with the instructor writing 'client' and 'server' and drawing a diagram to illustrate the concept. The diagram shows a server at site A, a client at site B, and a network connecting them, with an arrow indicating communication from the client to the server to access resources. The instructor also writes 'work load -> dist' to suggest that workloads are distributed across the system.

The lecture provides a foundational overview of distributed systems. It begins by outlining the chapter's scope, covering key areas like network structures, protocols, and file systems. The core of the lesson is the formal definition of a distributed system as a network of loosely coupled processors. The instructor then builds on this by introducing the client-server model, using a diagram to visually explain how a client at one site can access a resource hosted by a server at another site, which is the fundamental mechanism for resource sharing in such systems.