System Design Introduction For Interview.

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System design introduction

A - Ask good questions B - Don't use buzzwords C - Clear and organized thinking D - Drive discussions with 80-20 rule Things to consider Features API Availability Latency Scalability Durability Class Diagram Security and Privacy Cost-effective Concepts to know Vertical vs horizontal scaling CAP theorem ACID vs BASE Partitioning/Sharding Consistent Hashing Optimistic vs pessimistic locking Strong vs eventual consistency RelationalDB vs NoSQL Types of NoSQL Key value Wide column Document-based Graph-based Caching Data center/racks/hosts CPU/memory/Hard drives/Network bandwidth Random vs sequential read/writes to disk HTTP vs http2 vs WebSocket TCP/IP model ipv4 vs ipv6 TCP vs UDP DNS lookup Http & TLS Public key infrastructure and certificate authority(CA) Symmetric vs asymmetric encryption Load Balancer CDNs & Edges Bloom filters and Count-Min sketch Paxos Leader election Design patterns and Object-oriented design Virtual machines and containers Pub-sub architecture MapReduce Multithreading, locks, synchronization, CAS(compare and set) Tools Cassandra MongoDB/Couchbase Mysql Memcached Redis Zookeeper Kafka NGINX HAProxy Solr, Elastic search Amazon S3 Docker, Kubernetes, Mesos Hadoop/Spark and HDFS