Paxos and Raft consensus algorithm can tolerate up to N/2 – 1 number of Crash or Network fault, where N is the total number of nodes in the network. However, what if the nodes behave maliciously? This particular class of fault is called Byzantine fault, and the Byzantine fault came from the interesting Byzantine Generals …
Permissioned Blockchain – Byzantine Generals Problem Read More »
906 total views
The idea of Paxos was difficult to prove because the individual nodes propose certain values and the acceptors accept those values. However, there is no leader in the system, and individual nodes need to wait for a certain amount of time to see whether someone is proposing a value. If none of them proposes a …
Permissioned Blockchain – Paxos Vs. Raft Consensus Algorithm Read More »
844 total views
The idea behind the Raft consensus algorithm is that the nodes (i.e., server computers) collectively select a leader, and the remaining nodes become the followers. The leader is responsible for state transition log replication across the followers under the closed distributed environment, assuming that all the nodes are trustworthy and have no malicious intent. The …
Permissioned Blockchain – Raft Consensus Read More »
1,297 total views
Scrum is a trendy agile model. It satisfies the criterion of agile model characteristics and its own developed characteristics and terminologies such as Self-organizing teams, Sprints, Product Backlog, etc. Scrum Model – Terminology Self-organizing team: A self-organizing team that decides who will do which work. It means the team members by themselves choose their own …
SDLC – Agile Methodology – Scrum Read More »
274 total views
Agile is actually an umbrella term, and there are certain characteristics that all agile development processes must follow. So, several methodologies come under the agile umbrella, and one of the prominent methodologies is Extreme Programming, and Kent Beck proposed it in 1999. Extreme Programming – It recommends taking the best practices to extreme levels. If …
SDLC – Agile Methodology – Extreme Programming Read More »
152 total views
The agile software development methodology is considered the fastest development process, and this is achieved by avoiding anything that wastes time and eliminates unnecessary activities. It follows the incremental and evolutionary model principles and decomposes the requirements into many small incremental parts, and these parts are developed over one to four weeks. It incorporates the …
SDLC – Agile Software Development Read More »
190 total views
The spiral software development life cycle (SDLC) model features incremental and Evolutionary development processes, which means it is developed over several iterations or loops similar to increments. In the spiral model, each loop may not result in deliverable software. In the incremental model, every increment actually leads to a deployable increment at the customer site, one …
SDLC – Spiral Model Read More »
404 total views
The Unified Process was developed by Ivar Jacobson, Grady Booch, and James Rumbaugh. It follows incremental and iterative processes and is extensively used for Object-Oriented Software Development. The incremental and iterative means that the requirements are identified upfront. Over several iterative developments, the software is deployed at the client-side, and the client feedback is obtained. The …
SDLC – Unified Process Read More »
1,947 total views
It was the first consensus algorithm proposed by L. Lamport in 1989. The objective was to choose a single value under the crash or network faults. We will look into the Paxos in a simplified view, and later we will try to understand how it can be implemented in a real system to ensure consensus. …
Permissioned Blockchain – Simplified view of Paxos Consensus Algorithm Read More »
974 total views
Need for Distributed Consensus If there is only a single decision-maker, we don’t need a consensus algorithm. In the case of two decision-makers (nodes) and the presence of any faults such as crash fault, or network fault or even if the node behaves maliciously, we can not reach a consensus. To reach a consensus, we …
Permissioned Blockchain – Properties of Consensus Algorithms Read More »
517 total views
