CS Deep dive into letter I in ACID Meaning of Isolation in ACID Most databases are accessed by multiple clients at the same time, which could lead to race condition issues when 1 transaction (txn) reads data that is concurrently modified
CS A note on Java Garbage Collection (GC) 1. Basic What is GC: a process that looks at Heap memory and identifies which objects are in use and which are not, and deleting the unused objects. Eligibility to be GC: objects
CS Rate limiter algorithms's consideration High level design of Rate LimiterRequirement Limit the number of requests a user can send to an API within a time window: n requests/minute. Window size = 1 minute. The APIs are accessible
CS A note on Distributed Id Generator Problem Generate unique Id in distributed environment: each node can generate unique Ids. Ids need to be sortable. Snowflake a service developed by Twitter for generating Id fulfilling above requirements Snowflake structure: 64
CS Cookie security 101 What is it? a piece of data stored in browser. can be set by: client: via Javascript. server: via HTTP response header. cookie is automatically passed to server in header of request. cookies
CS A note on Consistent Hashing Rehashing problem Hash function a function that maps data of arbitrary size to fixed-size values h: U → {0, 1, . . . , m − 1}. example: h(x) = x % m collision: k1 != k2 and h(k1) == h(
CS From RSA, Diffie Hellman to TLS protocol Background The questions I want to answer: How RSA and Diffie Hellman work? Pros and cons? How TLS handshake works? Why do we need both RSA and DP in TLS, when seem like
CS A note on B-Trees and database indexes (part 2) BTree and database indexes 1. How data is stored in hard disk? Modern hard disk drives are addressed as large one-dimensional arrays of logical blocks, where the logical block is the smallest unit
CS A note on B-Trees and database indexes (part 1) Introduction Recently, I have several questions about BTree and its application - database indexes: What is BTree? Kind of a cool name, huh? What special properties make we use BTree for database indexes?
CS Notes on RAFT Consensus Protocol (part 1) Introduction Consensus problem Given a distributed system such that: the network between nodes is unreliable (1) nodes can crash (2) there is only one leader node that client can communicate with. We want
CS A note on VPN, HTTPS, and Proxy VPN - Virtual Private Network is a private network that allows you to communiate over Internet privately. it is like your home/ office private network, where you can transfer data between computers accross
