Mutiara Tifana
57414692
4IA22
Minggu, 03 Juni 2018
Senin, 16 April 2018
Computation Theory and Cloud Computing
57414692
1. Introduction
a. Computational Theory
Computational
theory is the branch of computer science and mathematics that discusses whether
and how a problem can be solved on computational models, using algorithms. This
field of science deals primarily with regard to computability and complexity,
in relation to computational formalism.
To
conduct computational studies closely, computer scientists work with
mathematical abstractions from computers called computational models. There are
several models used, but the most commonly studied Turing machine. A Turing
machine can be thought of as a personal computer table with infinite memory
capacity, but can only be accessed in separate and discrete sections. Computer
scientists study Turing machines because they are easily formulated, analyzed
and used for proof, and because they represent a computational model that is
considered to be the most powerful, most sensible model possible. Unlimited
memory capacity may be seen as an unattainable trait, but any "decidable"
problem solved by a Turing machine will always only require a finite amount of
memory. So basically any problem that can be solved (decided) by mesin Turing
can be solved by a computer that has a limited amount of memory.
b. Implementation
of Modern Computing
·
Implementation of Modern Computing in
the Field of Economics
Implementation
in economic science is the study of agent-based computational modeling,
computational econometrics and statistics, financial computing, computational
modeling of dynamic macroeconomic systems, programming specifically designed
for economic computing, and the development of aids in computing economics
education. the problem that must be solved by the algorithm for example is to
solve the theory of statistics to solve the financial problems.
One
example of computing in economics is statistical computing. Statistical
computing is the department that studies the techniques of data processing,
program making, and data analysis and statistical information system
preparation techniques such as database compilation, data communications,
network systems, and statistical data dissemination. Computing can be used to
solve economic problems such as Data Mining, with data mining, a company can
solve problems in the most effective way possible.
·
Implementation of Modern Computation in
Chemistry
Implementation
of modern computation in the field of chemistry is Computational Chemistry is
the use of computer science to help solve chemical problems, for example the
use of super computers to calculate the structure and molecular properties. The
term chemical theory can be defined as a mathematical description for
chemistry, whereas computational chemistry is typically used when mathematical
methods are developed well enough to be used in computer programs. It should be
noted that the word "exact" or "perfect" does not appear
here, because very few chemical aspects can be calculated appropriately. Almost
all aspects of chemistry can be described in the scheme of quantitative or
qualitative computing almost.
·
Implementation of Modern Computation in
Mathematics
Resolving
a problem relating to mathematical calculations, but in the sense that will be
discussed in the discussion of modern computing is a system that will solve
mathematical problems using a computer by compiling algorithms that can be
understood by computers that are useful for solving human problems. There is a
numerical analysis that is an algorithm used to analyze mathematical problems.
For example, the application of mathematical computational techniques includes
numerical methods, scientific computing, finite element method, different
methods, scientific data mining, scientific process control and other related
methods to solve real estate issues are large.
· Implementation of Computing in the Field
of Geography
Geography
is the study of location and equation, and spatial variations of physical
phenomena, and humans on the surface of the earth. Computing in geology is
usually used for weather forecasting, especially in Indonesia there is one
state agency with the name of BMKG (Meteorology, Climatology and Geophysics
Agency), namely the state agency that examines observing the meteorology of air
quality and geophysical climatology in order to stay in accordance with the
legislation applicable in Indonesia.
·
Implementation of modern Computation in
the field of Physics
The
implementation of modern computing in the field of physics is Computational
Physics which studies a combination of Physics, Computer Science and Applied
Mathematics to provide solutions to "complex and complex events in the
real world" either by using simulations as well as the proper use of
algorithms. The understanding of physics in theory, experimentation, and
computation must be comparable in order to produce the appropriate numerical
and visualization / modeling solutions to understand the problems of Physics.
To perform work such as integral evaluation, solving differential equations,
solving simultaneous equations, plotting a function / data, making the
development of a series of functions, finding the roots of equations and
working with complex numbers that are the object of applying computational
physics. Many software or languages are used, both MatLab, Visual Basic,
Fortran, Open Source Physics (OSP), Labview, Mathematica, etc. are used for
understanding and finding numerical solutions to problems in Computational
Physics.
·
Implementation of modern computing in
the field of geology
In
the field of geology computational theory is usually used for mining, a
computer system is used to analyze mineral materials and minerals contained in
the soil. For example, Mining and used to analyze mineral materials and
minerals contained in the soil.
2. Cloud Computing
a. Introduction
Cloud
computing is a method for delivering information technology (IT) services in
which resources are retrieved from the Internet through web-based tools and
applications, as opposed to a direct connection to a server. Rather than
keeping files on a proprietary hard drive or local storage device, cloud-based storage makes
it possible to save them to a remote database. As long as an electronic device has access to the
web, it has access to the data and the software programs to run it.
It's
called cloud computing because the information being accessed is found in
"the cloud" and does not require a user to be in a specific place to
gain access to it. This type of system allows employees to work remotely.
Companies providing cloud services enable users to store files and applications
on remote servers, and then access all the data via the internet.
Advantages of Cloud Computing:
·
Cost
Cloud computing
eliminates the capital expense of buying hardware and software and setting up
and running on-site datacenters—the racks of servers, the round-the-clock
electricity for power and cooling, the IT experts for managing the
infrastructure. It adds up fast.
·
Speed
Most cloud computing
services are provided self service and on demand, so even vast amounts of
computing resources can be provisioned in minutes, typically with just a few
mouse clicks, giving businesses a lot of flexibility and taking the pressure
off capacity planning.
·
Global Scale
The benefits of cloud computing services include the ability
to scale elastically. In cloud speak, that means delivering the right amount of
IT resources—for example, more or less computing power, storage,
bandwidth—right when its needed and from the right geographic location.
·
Productivity
On-site datacenters typically require a lot of “racking and
stacking”—hardware set up, software patching and other time-consuming IT
management chores. Cloud computing removes the need for many of these tasks, so
IT teams can spend time on achieving more important business goals.
·
Performance
The
biggest cloud computing services run on a worldwide network of secure
datacenters, which are regularly upgraded to the latest generation of fast and
efficient computing hardware. This offers several benefits over a single corporate
datacenter, including reduced network latency for applications and greater
economies of scale.
·
Reliability
Cloud computing makes data backup, disaster recovery and
business continuity easier and less expensive, because data can be mirrored at
multiple redundant sites on the cloud provider’s network.
Disadvantages of Cloud Computing
Initially, security was
seen as a detractor from using the cloud, especially when it came to sensitive
medical records and financial information. While regulations are forcing cloud
computing services to shore up their security and compliance measures, it
remains an ongoing issue. Media headlines are constantly screaming about data
breaches at this or that company, in which sensitive information has made its
way into the hands of malicious hackers who may delete, manipulate or otherwise
exploit the data (though, according to some reports, most of the data breeches
have been with on-site systems, not those in the cloud). Encryption
protects vital information, but if the encryption key is lost, the data
disappears.
Servers
maintained by cloud computing companies can fall victim to a natural disasters,
internal bugs and power outages, too. And unfortunately, the geographical reach
of cloud computing cuts both ways: A blackout in California could paralyze
users In New York; a firm in Texas could lose its data if something causes its
Maine-based provider to crash.
Ultimately,
as with any new technology, there is a learning curve for employees and
managers. But with many individuals accessing and manipulating information
through a single portal, inadvertent mistakes can transfer across an entire
system.
Types of Cloud Computing
·
SAAS
Saas (Software
as a Service) provides clients with the ability to use software applications on
a remote basis via an internet web browser. Software as a service is also
referred to as “software on demand”.
Clients can access SaaS
applications from anywhere via the web because service providers
host applications and their associated data at their location. The primary
benefit of SaaS, is a lower cost of use, since subscriber fees require a much
smaller investment than what is typically encountered under the traditional
model of software delivery. Licensing fees, installation costs, maintenance
fees and support fees that are routinely associated with the traditional model
of software delivery can be virtually eliminated by subscribing to the SaaS
model of software delivery. Examples of SaaS include: Google Applications and
internet based email applications like Yahoo! Mail, Hotmail and Gmail.
·
PAAS
PaaS (Platform
as a Service) provides clients with the ability to develop and publish
customized applications in a hosted environment via the web. It represents
a new model for software development that is rapidly increasing in its popularity. An example of PaaS is
Salesforce.com.
PaaS provides a framework
for agile software development, testing, deployment and maintenance in an
integrated environment. Like SaaS, the primary benefit of PaaS, is a lower
cost of use, since subscriber fees require a much smaller investment than what
is typically encountered when implementing traditional tools for software
development, testing and deployment. PaaS providers handle platform maintenance
and system upgrades, resulting in a more efficient and cost effective solution
for enterprise software development.
·
IAAS
IaaS (Infrastructure as a
Service) allows clients to remotely use IT hardware and resources on a
“pay-as-you-go” basis. It is also referred to as HaaS (hardware as a service).
Major IaaS players include companies like IBM, Google and Amazon.com. IaaS
employs virtualization, a method of creating and managing infrastructure
resources in the “cloud”. IaaS provides small start up firms with a major
advantage, since it allows them to gradually expand their IT infrastructure
without the need for large capital investments in hardware and peripheral
systems.
b. Grid Computing
Grid Computing is the use of resources
that involve multiple distributed and geographically dispersed computers to
solve large-scale computing problems. Grid computing is a branch of distributed computing. The computer grid has
a more prominent difference and is applied to the infrastructure side of the
completion of a process.
Grid
computing is a form of clusters (composites) computers that tend not bound by
geographical boundaries. On the other hand, clusters are always implemented in
one place by combining multiple computers over a network.
The
initial idea of grid computing begins with the existence of distributed
computing, ie studying the use of co-ordinated computers that are physically
separate or distributed. Distributed systems require different applications
with centralized systems. Then it develops again into parallel computing which
is a computing technique simultaneously by utilizing multiple computers
simultaneously.
Grid
computing offers a low-cost computing solution, which utilizes scattered and
heterogeneous resources and easy access from anywhere. Globus Toolkit is a
collection of software and libraries for creating open-source grid computing
environments. With the grid computing environment is expected to simplify and
optimize the execution of programs that use parallel libraries. And Indonesia
has used Grid system and named InGrid (Inherent Grid).
The
grid computing system began operations in March 2007 and continues to be
developed to date. InGrid connects several public and private universities
spread across Indonesia and several government agencies such as the Meteorology
and Geophysics Agency.
Concept
of Grid Computing
Some basic concepts of grid
computing:
- Resources are managed and controlled locally.
- Different resources may have different policies and mechanism
- Dynamic nature: Resources and users can change frequently
- Collaborative environment for e-community
- Resource, Network, and Process
How Grid Computing Works
1. The system coordinates the computational resources that are not under centralized control. if the resources used are within a single domain of administrative domain, then the computation can not be said to be grid computing.
2. The system uses standards and protocols that are open (not linked to a particular implementation or product). Grid computing is composed of agreements on fundamental issues, required to realize large-scale computing together. Agreements and standards required are in the areas of authentication, authorization, resource search, and access to resources.
3. The system strives to achieve sophisticated quality of service, (nontrivial quality of service) that is far above the quality of service of individual
components of the grid computing.
Advantages and Disadvantages of Grid Computing
1. Grid computing promises increased utilities, and greater flexibility for infrastructure resources, applications and information. And also promising increased productivity of company work.
2. Grid computing can provide money savings, both in terms of capital investment and operating costs. And some of the obstacles experienced by Indonesian people in applying grid computing technology are as follows:
Grid Computing Example
- Scientific Simulation
Grid computing is implemented in physics, chemistry, and biology to simulate complex processes.
- Medical Images
Use of grid data and grid computing to store medical-image. An example is the eDiaMoND project.
- Computer-Aided Drug Discovery (CADD)
Grid computing is used to aid drug discovery. One example is: Molecular Modeling Laboratory (MML) at the University of North Carolina (UNC).
- Big Science
Grid data and grid computing are used to assist government-sponsored laboratory projects. Examples are found in DEISA.
- E-Learning
Grid computing helps build infrastructure to meet the needs of information exchange in education. An example is AccessGrid.
c. Virtualization in Cloud Computing
Virtualization is the "creation of a virtual (rather than actual) version of something, such as a server, a desktop, astorage device, an operating system or network resources". In other words, Virtualization is a technique, which allows to share a single physical instance of a resource or an application among multiple customers and organizations. It does by assigning a logical name to a physical storage and providing a pointer to that physical resource when demanded.
What is the concept behind the Virtualization?
Creation of a virtual machine over existing operating system and hardware is known as Hardware Virtualization. A Virtual machine provides an environment that is logically separated from the underlying hardware. The machine on which the virtual machine is going to create is known as Host Machine and that virtual machine is referred as a Guest Machine.
Types of Virtualization:
1. Hardware Virtualization:
When the virtual machine software or virtual machine manager (VMM) is directly installed on the hardware system is known as hardware virtualization.
The main job of hypervisor is to control and monitoring the processor, memory and other hardware resources. After virtualization of hardware system we can install different operating system on it and run different applications on those OS.
Usage:
Hardware virtualization is mainly done for the server platforms, because controlling virtual machines is much easier than controlling a physical server.
2. Operating System Virtualization:
When the virtual machine software or virtual machine manager (VMM) is installed on the Host operating system instead of directly on the hardware system is known as operating system virtualization.
Usage:
Operating System Virtualization is mainly used for testing the applications on different platforms of OS.
3. Server Virtualization:
When the virtual machine software or virtual machine manager (VMM) is directly installed on the Server system is known as server virtualization.
Usage:
Server virtualization is done because a single physical server can be divided into multiple servers on the demand basis and for balancing the load.
4. Storage Virtualization:
Storage virtualization is the process of grouping the physical storage from multiple network storage devices so that it looks like a single storage device. Storage virtualization is also implemented by using software applications.
Usage:
Storage virtualization is mainly done for back-up and recovery purposes.
How does virtualization work in cloud computing?
Virtualization plays a very important role in the cloud computing technology, normally in the cloud computing, users share the data present in the clouds like application etc, but actually with the help of virtualization users shares the Infrastructure.
The main usage of Virtualization Technology is to provide the applications with the standard versions to their cloud users, suppose if the next version of that application is released, then cloud provider has to provide the latest version to their cloud users and practically it is possible because it is more expensive.
To overcome this problem we use basically virtualization technology, By using virtualization, all severs and the software application which are required by other cloud providers are maintained by the third party people, and the cloud providers has to pay the money on monthly or annual basis.
d. Distributed Computing
Distributed Computing can be defined as the use of a distributed system to solve a single large problem by breaking it down into several tasks where each task is computed in the individual computers of the distributed system. A distributed system consists of more than one self directed computer that communicates through a network. All the computers connected in a network communicate with each other to attain a common goal by making use of their own local memory. On the other hand, different users of a computer possibly might have different requirements and the distributed systems will tackle the coordination of the shared resources by helping them communicate with other nodes to achieve their individual tasks.
Distributed Computing System Examples
- World Wide Web
- Social Media Giant Facebook
- Hadoop’s Distributed File System (HDFS)
- ATM
- Cloud Network Systems(Specialized form of Distributed Computing Systems)
- Google Bots, Google Web Server, Indexing Server
Benefits of Distributed Computing
How Grid Computing Works
1. The system coordinates the computational resources that are not under centralized control. if the resources used are within a single domain of administrative domain, then the computation can not be said to be grid computing.
2. The system uses standards and protocols that are open (not linked to a particular implementation or product). Grid computing is composed of agreements on fundamental issues, required to realize large-scale computing together. Agreements and standards required are in the areas of authentication, authorization, resource search, and access to resources.
3. The system strives to achieve sophisticated quality of service, (nontrivial quality of service) that is far above the quality of service of individual
components of the grid computing.
Advantages and Disadvantages of Grid Computing
1. Grid computing promises increased utilities, and greater flexibility for infrastructure resources, applications and information. And also promising increased productivity of company work.
2. Grid computing can provide money savings, both in terms of capital investment and operating costs. And some of the obstacles experienced by Indonesian people in applying grid computing technology are as follows:
Grid Computing Example
- Scientific Simulation
Grid computing is implemented in physics, chemistry, and biology to simulate complex processes.
- Medical Images
Use of grid data and grid computing to store medical-image. An example is the eDiaMoND project.
- Computer-Aided Drug Discovery (CADD)
Grid computing is used to aid drug discovery. One example is: Molecular Modeling Laboratory (MML) at the University of North Carolina (UNC).
- Big Science
Grid data and grid computing are used to assist government-sponsored laboratory projects. Examples are found in DEISA.
- E-Learning
Grid computing helps build infrastructure to meet the needs of information exchange in education. An example is AccessGrid.
c. Virtualization in Cloud Computing
Virtualization is the "creation of a virtual (rather than actual) version of something, such as a server, a desktop, astorage device, an operating system or network resources". In other words, Virtualization is a technique, which allows to share a single physical instance of a resource or an application among multiple customers and organizations. It does by assigning a logical name to a physical storage and providing a pointer to that physical resource when demanded.
What is the concept behind the Virtualization?
Creation of a virtual machine over existing operating system and hardware is known as Hardware Virtualization. A Virtual machine provides an environment that is logically separated from the underlying hardware. The machine on which the virtual machine is going to create is known as Host Machine and that virtual machine is referred as a Guest Machine.
Types of Virtualization:
1. Hardware Virtualization:
When the virtual machine software or virtual machine manager (VMM) is directly installed on the hardware system is known as hardware virtualization.
The main job of hypervisor is to control and monitoring the processor, memory and other hardware resources. After virtualization of hardware system we can install different operating system on it and run different applications on those OS.
Usage:
Hardware virtualization is mainly done for the server platforms, because controlling virtual machines is much easier than controlling a physical server.
2. Operating System Virtualization:
When the virtual machine software or virtual machine manager (VMM) is installed on the Host operating system instead of directly on the hardware system is known as operating system virtualization.
Usage:
Operating System Virtualization is mainly used for testing the applications on different platforms of OS.
3. Server Virtualization:
When the virtual machine software or virtual machine manager (VMM) is directly installed on the Server system is known as server virtualization.
Usage:
Server virtualization is done because a single physical server can be divided into multiple servers on the demand basis and for balancing the load.
4. Storage Virtualization:
Storage virtualization is the process of grouping the physical storage from multiple network storage devices so that it looks like a single storage device. Storage virtualization is also implemented by using software applications.
Usage:
Storage virtualization is mainly done for back-up and recovery purposes.
How does virtualization work in cloud computing?
Virtualization plays a very important role in the cloud computing technology, normally in the cloud computing, users share the data present in the clouds like application etc, but actually with the help of virtualization users shares the Infrastructure.
The main usage of Virtualization Technology is to provide the applications with the standard versions to their cloud users, suppose if the next version of that application is released, then cloud provider has to provide the latest version to their cloud users and practically it is possible because it is more expensive.
To overcome this problem we use basically virtualization technology, By using virtualization, all severs and the software application which are required by other cloud providers are maintained by the third party people, and the cloud providers has to pay the money on monthly or annual basis.
d. Distributed Computing
Distributed Computing can be defined as the use of a distributed system to solve a single large problem by breaking it down into several tasks where each task is computed in the individual computers of the distributed system. A distributed system consists of more than one self directed computer that communicates through a network. All the computers connected in a network communicate with each other to attain a common goal by making use of their own local memory. On the other hand, different users of a computer possibly might have different requirements and the distributed systems will tackle the coordination of the shared resources by helping them communicate with other nodes to achieve their individual tasks.
Distributed Computing System Examples
- World Wide Web
- Social Media Giant Facebook
- Hadoop’s Distributed File System (HDFS)
- ATM
- Cloud Network Systems(Specialized form of Distributed Computing Systems)
- Google Bots, Google Web Server, Indexing Server
Benefits of Distributed Computing
- Distributed computing systems provide a better price/performance ratio when compared to a centralized computer because adding microprocessors is more economic than mainframes.
- Distributed Computing Systems have more computational power than centralized (mainframe) computing systems. Distributed Computing Systems provide incremental growth so that organizations can add software and computation power in increments as and when business needs.
e. Map Reduce and NoSQL (Not Only SQL)
Map Reduce andNoSQL (Not Only SQL) is a framework programmingto help users develop a large size data that can be distributed to each other. Map-Reduce is one of the most important technical concepts in cloud technology especially because it can be implemented in a distributed computing environment. Thus it will guarantee the scalability of our application. MapReduce is a Google-released programming model intended to process giant distributed and parallel data in a cluster of thousands of computers. In processing the data, MapReduce is divided into 2 main processes, namely Map and Reduce. The Map process is tasked with collecting information from the pieces of data distributed within each computer in the cluster (group of connected computers). The result is left to the Reduce process for further processing. The result of the Reduce process is the final result sent to the user.
NoSQL is a database type that is very much different from the concept of RDBMS or ODBMS. The main difference itself is that it does not recognize the term relation and does not use the concept of schema. In NoSQL, each table stands alone independent of other tables. NoSQL Database is a database of type NoSQL, ie this database is not familiar with the term relational and does not use the concept of schema. Examples of NoSQL Databases are MongoDB.
f. NoSQL Database
NoSQL is an approach to databases that represents a shift away from traditional relational database management systems (RDBMS). To define NoSQL, it is helpful to start by describing SQL, which is a query language used by RDBMS. Relational databases rely on tables, columns, rows, or schemas to organize and retrieve data. In contrast, NoSQL databases do not rely on these structures and use more flexible data models. NoSQL can mean “not SQL” or “not only SQL.” As RDBMS have increasingly failed to meet the performance, scalability, and flexibility needs that next-generation, data-intensive applications require, NoSQL databases have been adopted by mainstream enterprises. NoSQL is particularly useful for storing unstructured data, which is growing far more rapidly than structured data and does not fit the relational schemas of RDBMS. Common types of unstructured data include: user and session data; chat, messaging, and log data; time series data such as IoT and device data; and large objects such as video and images.
TYPES OF NOSQL DATABASES
1. Key-value data stores: Key-value NoSQL databases emphasize simplicity and are very useful in accelerating an application to support high-speed read and write processing of non-transactional data. Stored values can be any type of binary object (text, video, JSON document, etc.) and are accessed via a key. The application has complete control over what is stored in the value, making this the most flexible NoSQL model. Data is partitioned and replicated across a cluster to get scalability and availability. For this reason, key value stores often do not support transactions. However, they are highly effective at scaling applications that deal with high-velocity, non-transactional data.
2. Document stores: Document databases typically store self-describing JSON, XML, and BSON documents. They are similar to key-value stores, but in this case, a value is a single document that stores all data related to a specific key. Popular fields in the document can be indexed to provide fast retrieval without knowing the key. Each document can have the same or a different structure.
3. Wide-column stores: Wide-column NoSQL databases store data in tables with rows and columns similar to RDBMS, but names and formats of columns can vary from row to row across the table. Wide-column databases group columns of related data together. A query can retrieve related data in a single operation because only the columns associated with the query are retrieved. In an RDBMS, the data would be in different rows stored in different places on disk, requiring multiple disk operations for retrieval.
4. Graph stores: A graph database uses graph structures to store, map, and query relationships. They provide index-free adjacency, so that adjacent elements are linked together without using an index. Multi-modal databases leverage some combination of the four types described above and therefore can support a wider range of applications.
BENEFITS OF NOSQL
NoSQL databases offer enterprises important advantages over traditional RDBMS, including:
1. Scalability: NoSQL databases use a horizontal scale-out methodology that makes it easy to add or reduce capacity quickly and non-disruptively with commodity hardware. This eliminates the tremendous cost and complexity of manual sharding that is necessary when attempting to scale RDBMS.
2. Performance: By simply adding commodity resources, enterprises can increase performance with NoSQL databases. This enables organizations to continue to deliver reliably fast user experiences with a predictable return on investment for adding resources—again, without the overhead associated with manual sharding.
3. High Availability: NoSQL databases are generally designed to ensure high availability and avoid the complexity that comes with a typical RDBMS architecture that relies on primary and secondary nodes. Some “distributed” NoSQL databases use a masterless architecture that automatically distributes data equally among multiple resources so that the application remains available for both read and write operations even when one node fails.
4. Global Availability: By automatically replicating data across multiple servers, data centers, or cloud resources, distributed NoSQL databases can minimize latency and ensure a consistent application experience wherever users are located. An added benefit is a significantly reduced database management burden from manual RDBMS configuration, freeing operations teams to focus on other business priorities.
5. Flexible Data Modeling: NoSQL offers the ability to implement flexible and fluid data models. Application developers can leverage the data types and query options that are the most natural fit to the specific application use case rather than those that fit the database schema. The result is a simpler interaction between the application and the database and faster, more agile development.
Sources:
http://deynarkhairunnisa.blogspot.co.id/2015/10/pengantar-komputasi-grid.html
http://febbri-grunge.blogspot.co.id/2015/06/komputasi-grid-grid-computing.html
https://id.wikipedia.org/wiki/Komputasi_grid
https://dyaherwiyanti.wordpress.com/2016/03/28/map-reduce-dan-nosql-not-only-sql/
http://basho.com/resources/nosql-databases/