Kafka and Flume both are used for real time event processing system. They both are developed by Apache. Kafka is a publish-subscribe model messaging system. It can be used to communicate between publisher and subscriber using topic. One of the best features of Kafka is, it is highly available and ... Read More

Apache Kafka and Kinesis both software tool is to processing data stream in real time. Apache kafka is developed by linked-in and it is written in Scala and java. Kinesis is developed and managed by Amazon. It can be only used as a services.According to the amazon documentation −Amazon Kinesis ... Read More

OLAP  stands for On-Line Analytical Processing. It is used for analysis of database information from multiple database systems at one time such as sales analysis and forecasting, market research, budgeting and etc. Data Warehouse is the example of OLAP system.OLTP stands for On-Line Transactional processing. It is used for maintaining ... Read More

Monolithic architecture  is built as one large system and is usually one code-base. Monolithic application is tightly coupled and entangled as the application evolves, making it difficult to isolate services for purposes such as independent scaling or code maintainability.It extremely difficult to change technology or language or framework because everything ... Read More

ArrayBlockingQueue stores elements in FIFO order. Insertion of element always happened at the tail of the queue and removal of the element always happened from the head of the queue.  It is thread safe and It is bounded array queue therefore once created, the capacity cannot be changed. It is ... Read More

OAuth is designed for providing authorization of the third party without providing password. It is http based. OAuth provides an access token that can be exchanged for any supported assertion via an API.OpenId is designed for authentication. In openId third-party authenticate your users for you, by using accounts they already ... Read More

PropositionA proposition is a collection of declarative statements that has either a truth value "true” or a truth value "false". A propositional consists of propositional variables and connectives. We denote the propositional variables by capital letters (A, B, etc). The connectives connect the propositional variables.PredicateA predicate is an expression of ... Read More

A covering graph is a subgraph that contains either all the vertices or all the edges corresponding to some other graph. A subgraph that contains all the vertices is called a line/edge covering. A subgraph that contains all the edges is called a vertex covering.Let 'G' = (V, E) be ... Read More

$ operatorOperator is used to define variables in php. For example, message. Such variables can contain any type of value like int, string, etc.$$ operator$$ is a special operator that contains the name of another variable and can be used to access the value of that variable.ExampleFollowing the example, shows ... Read More

'AND' Logical operator'AND' operator is a logical AND operator but has low precedence to = operator.'&&' Logical operator'&&' is also a logical AND operator but has high precedence to = operator.ExampleFollowing the example, shows the difference of 'AND' vs '&&' operators. Live Demo    PHP Example   ... Read More