Architecture and Distributed Systems, Web Distributed Systems Design

Web Distributed Systems
Web Distributed Systems Design

Availability
The uptime of a website is absolutely critical to the reputation and functionality
of many companies. For some of the larger online retail sites, being unavailable
for even minutes can result in thousands or millions of dollars in lost revenue, so
designing their systems to be constantly available and resilient to failure is both a
fundamental business and a technology requirement. High availability in
distributed systems requires the careful consideration of redundancy for key
components, rapid recovery in the event of partial system failures, and graceful
degradation when problems occur.

Performance
Website performance has become an important consideration for most sites. The
speed of a website affects usage and user satisfaction, as well as search engine
rankings, a factor that directly correlates to revenue and retention. As a result,
creating a system that is optimized for fast responses and low latency is key.

Reliability
A system needs to be reliable, such that a request for data will consistently return
the same data. In the event the data changes or is updated, then that same
request should return the new data. Users need to know that if something is
written to the system, or stored, it will persist and can be relied on to be in place
for future retrieval.

Scalability
When it comes to any large distributed system, size is just one aspect of scale that
needs to be considered. Just as important is the effort required to increase capacity to
handle greater amounts of load, commonly referred to as the scalability of the system.
Scalability can refer to many different parameters of the system: how much additional
traffic can it handle, how easy is it to add more storage capacity, or even how many
more transactions can be processed.

Manageability
Designing a system that is easy to operate is another important consideration. The
manageability of the system equates to the scalability of operations: maintenance and
updates. Things to consider for manageability are the ease of diagnosing and
understanding problems when they occur, ease of making updates or modifications,
and how simple the system is to operate. (I.e., does it routinely operate without failure
or exceptions?)

Cost
Cost is an important factor. This obviously can include hardware and software costs,
but it is also important to consider other facets needed to deploy and maintain the
system. The amount of developer time the system takes to build, the amount of
operational effort required to run the system, and even the amount of training
required should all be considered. Cost is the total cost of ownership.

Oracle, JBoss, REST, NoSQL,
Spring, Clusters, VMware???

First step-> B2B or B2C???
Business-to-business (B2B) or Business-to-consumer(B2C)?
or
B2G(Business-to-government)?

May be O2O? - a new Model for the Development
of E-Commerce
Online2offline?

Let’s Start
We need architecture which support –
Flexibility, Scalability , Manageability
But what is Software architecture?

Architecture is the fundamental organization of a system
embodied in its components, their relationships to each
other, and to the environment, and the principles guiding its
design and evolution.

A system is a collection of components organized to
accomplish a specific function or set of functions. The term
system encompasses individual applications, systems in the
traditional sense, subsystems, systems of systems, product
lines, product families, whole enterprises, and other
aggregations of interest. A system exists to fulfill one or more
missions in its environment.

The environment, or context, determines the setting and
circumstances of developmental, operational, political, and
other influences upon that system.

A mission is a use or operation for which a system is intended
by one or more stakeholders to meet some set of objectives.

A stakeholder is an individual, team, or organization (or
classes thereof) with interests in, or concerns relative to, a
system.

A component is a modular part of a system that encapsulates
its contents and whose manifestation is replaceable within
its environment. A component defines its behavior in terms
of provided and required interfaces. As such, a component
serves as a type, whose conformance is defined by these
provided and required interfaces (encompassing both their
static as well as dynamic semantics).

The software architecture of a system or a collection of
systems consists of all the important design decisions about
the software structures and the interactions between those
structures that comprise the systems. The design decisions
support a desired set of qualities that the system should
support to be successful. The design decisions provide a
conceptual basis for system development, support, and
maintenance. [McGovern]

One component example:
MessagingService

SOA!!!
Service-oriented Architecture

Forgot about global data model
Choose Service model

Technologies?
Java EE – EJB3.2, JSF2.2, JMS
REST
NoSQL
SQL
WILDFLY

Slides author: Armen Arzumanyan
Slides source: www
Linkedin : https://www.linkedin.com/pub/armen-arzumanyan/4/b24/605
Blog: https://armdev.wordpress.com/
Github: https://github.com/armdev
E-mail: armen.arzumanyan@gmail.com

Architecture and Distributed Systems, Web Distributed Systems Design

Architecture and Distributed Systems, Web Distributed Systems Design

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