What is a Distributed System?

Autonomous computing elements

Single coherent system

Centralized/Decentralized/Distributed

Middleware

RPC

Transactions

Goals for Distributed Systems

Types of Distributed Systems

Computing Systems

Cluster Computing

Grid Computing

Cloud computing

Information Systems

Pervasive Systems

Internet of Things (IoT)

Reasons for distributed data

Replication

Leader-based replication

Leader-based replication

Syncrhonous vs. Asynchronous Replication

Handling node outages

Data loss

Split Brain

Timeout

Read your own writes

Monotonic reads

Multi-Leader Replication

Single vs Multileader

Performance

Tolerance of outages

Tolerance of network problems

Leaderless Replication

Partitioning

Hotspot

Partitioning by Hash Key

Rebalancing

Request routing

Zoo Keeper

Models of Data Flow

via Database

via Service Calls

Service Calls - Web services

Service Calls - REST
REpresentational State Transfer

Service Calls - SOAP
Simple Object Access Protocol

via Asynchronous Message Passing

SOA

Message broker