What is a Distributed System?
Distributed System is a collection of autonomous computer systems that are physically separated but are connected by a centralized computer network that is equipped with distributed system software. The autonomous computers will communicate among each system by sharing resources and files and performing the tasks assigned to them.
Example of Distributed System:
Any Social Media can have its Centralized Computer Network as its Headquarters and computer systems that can be accessed by any user and using their services will be the Autonomous Systems in the Distributed System Architecture.
- Distributed System Software: This Software enables computers to coordinate their activities and to share the resources such as Hardware, Software, Data, etc.
- Database: It is used to store the processed data that are processed by each Node/System of the Distributed systems that are connected to the Centralized network.
- As we can see that each Autonomous System has a common Application that can have its own data that is shared by the Centralized Database System.
- To Transfer the Data to Autonomous Systems, Centralized System should be having a Middleware Service and should be connected to a Network.
- Middleware Services enables some services which are not present in the local systems or centralized system default by acting as an interface between the Centralized System and the local systems. By using components of Middleware Services systems communicate and manage data.
- The Data which is been transferred through the database will be divided into segments or modules and shared with Autonomous systems for processing.
- The Data will be processed and then will be transferred to the Centralized system through the network and will be stored in the database.
Characteristics of Distributed System:
- Resource Sharing: It is the ability to use any Hardware, Software, or Data anywhere in the System.
- Openness: It is concerned with Extensions and improvements in the system (i.e., How openly the software is developed and shared with others)
- Concurrency: It is naturally present in the Distributed Systems, that deal with the same activity or functionality that can be performed by separate users who are in remote locations. Every local system has its independent Operating Systems and Resources.
- Scalability: It increases the scale of the system as a number of processors communicate with more users by accommodating to improve the responsiveness of the system.
- Fault tolerance: It cares about the reliability of the system if there is a failure in Hardware or Software, the system continues to operate properly without degrading the performance the system.
- Transparency: It hides the complexity of the Distributed Systems to the Users and Application programs as there should be privacy in every system.
Advantages of Distributed System:
- Applications in Distributed Systems are Inherently Distributed Applications.
- Information in Distributed Systems is shared among geographically distributed users.
- Resource Sharing (Autonomous systems can share resources from remote locations).
- It has a better price performance ratio and flexibility.
- It has shorter response time and higher throughput.
- It has higher reliability and availability against component failure.
- It has extensibility so that systems can be extended in more remote locations and also incremental growth.
Disadvantages of Distributed System:
- Relevant Software for Distributed systems does not exist currently.
- Security possess a problem due to easy access to data as the resources are shared to multiple systems.
- Networking Saturation may cause a hurdle in data transfer i.e., if there is a lag in the network then the user will face a problem accessing data.
Applications Area of Distributed System:
- Finance and Commerce: Amazon, eBay, Online Banking, E-Commerce websites.
- Information Society: Search Engines, Wikipedia, Social Networking, Cloud Computing.
- Cloud Technologies: AWS, Salesforce, Microsoft Azure, SAP.
- Entertainment: Online Gaming, Music, youtube.
- Healthcare: Online patient records, Health Informatics.
- Education: E-learning.
- Transport and logistics: GPS, Google Maps.
- Environment Management: Sensor technologies.