Service Broker Algorithms in Cloud Computing

Service Broker Algorithms in Cloud Computing

Divya Raj K , Nijeesha G, Santhosh B

Dept of MCA, AIMIT,

St Aloysius College(Autonomous), Mangalore

Abstract – A virtual pool of resources is provided to the users by means of Cloud Computing. Efficient use of the limited resources available is one of the requirements in the cloud In this paper we have compared the various service broker algorithms such as Service Proximity Based Routing, Performance Optimized Routing, Enhanced Proximity-Based Routing Algorithm and Resource Location and Cost based Performance Optimized Routing algorithms

Key words: cloud computing, scheduling, service broker algorithms

1. INTRODUCTION

   Cloud computing provides dynamic, virtualized and scalable on demand resources over the internet. This also helps the users to access various applications as well as the related data items from anywhere. Various companies could rent storage as well as computational resources via cloud and thus reducing their infrastructure cost. Cloud computing provides a pay as you go model which allows the companies to make use of software, storage, platforms as well as infrastructure.

   1. Introduction to Scheduling

      Allocation of jobs to virtual machines is done by the scheduler. It is used to allocate the jobs to the various resources. There are various constraints given by the users. These can be deadlines such as jobs to be completed within a specified amount of time as well as limiting the budget. There are also certain constraints that are specified by the service providers so as to maximize the utilization of resources and benefits.

   2. Optimization Criteria

   Optimization criteria will specify the goals of the scheduling process and is used when making decisions with respect to scheduling. We have to increase the usage of resources, increase the number of jobs successfully completed as well as have to minimize the response time. A constraint and a criterion can be used in defining the objective function. Therefore the value of the objective function could be maximized or minimized based on the criteria that is mentioned by the user.

2. Introduction to Cloud Application Service Broker

   Service Broker controls the traffic between the User Bases and the Data Centres. This will determine which Data Centre will service the jobs from the User Base.

   1. Service Broker Algorithms

      1. Service Proximity Based Routing[2]

         This is the simplest Service Broker implementation.

      2. Performance Optimized Routing[2]

This policy is implemented by the BestResponseTimeServiceBroker, which extends the ServiceProximityServiceBroker.

2.1.3. Enhanced Proximity-Based Routing Algorithm [14]

3.

Simulation results and analysis

The algorithms are simulated in a simulation toolkit CloudAnalyst[2]

2.1.4.

Resource Location and Cost based Performance Optimized Routing [13]

1. Introduction to Cloud Analyst

   To support the infrastructure and application-level requirements such as modelling of on demand virtualization arising from Cloud computing paradigm, enabled resource simulators are required. Few simulators like CloudSim [1] and CloudAnalyst [2] are available. CloudAnalyst has been used in our paper as a simulation tool. A snapshot of the GUI of CloudAnalyst simulation toolkit is shown in figure 1(a) and its architecture is shown figure 1(b).

2. Simulation scenario1

In this scenario User Base and data center configurations are as given in Table 1 and Table 2 and it is assumed that UB1 user requests can be executed in any datacenter except in Region 1. In the Proximity-Based Routing algorithm always selects closest data center and most of the cases data center within the user base.

Fig 4: Service Proximity based routing algorithm- Datacenter Loading

Fig 5: Service Proximity based routing algorithm

Fig 6: Performance Optimized Routing- Datacenter Loading

Fig 7: Performance Optimized Routing

Fig 8: Resource Location and Cost based Performance Optimized Routing- Datacenter Loading

Fig 9: Resource Location and Cost based Performance Optimized Routing

Fig 4 and Fig 6 shows the results of datacenter loading .It shows the loads are equally distributed between the dataceneters.. Here UB1 region is 1. Results shows that UB1 requests are processed in data centers DC1 and DC2 .The assignment of the user bases to the data centers also depicted in the final simulation results as shown in Fig 5 and fig 7. These experiments shows that Service Proximity based routing algorithm always it selects the closest datacenter and performance optimised algorithm selects If least respose time data center is the closest data center then it selects the closest data center else selects closest data center and datacenter with the least response time with a 50:50 chance.

Fig 8 shows the results of data center loading . Here UB1 region is 1 and the SLA requirement is request can be executed in any region other than region1. Results shows that

UB1 requests are processed in data centers DC3 and DC4 . It satisfies SLA requirement . The data centers DC3 and DC4 are in region 2 and cost per VM$/Hr is same , the Fig 8 is also shows that load is equally distributed between the data centers. The assignment of the user bases to the data centers also depicted the final simulation results as shown in Fig 9.

3.2 Simulation scenario2

In this scenario User Base and data center configurations as given in Table 3 and Table 4 and It is assumed that UB1 user requests can be executed in any datacenter except in region 1 and region 3. UB2 user requests can be executed in any datacenter except in region 2 and 4 and UB3 can be executed in any datacenter.

Fig 10: Service Proximity based routing algorithm- Datacenter Loading

Fig 11: Service Proximity based routing algorithm

Fig 12 : Performance Optimized Routing- Datacenter Loading

Fig 13: Performance Optimized Routing

Fig 14: Resource Location and Cost based Performance Optimized Routing- Datacenter Loading

Fig 15Resource Location and Cost based Performance Optimized Routing

Fig 10 and Fig 12 shows the results of datacenter loading .It shows the loads are equally distributed between the datacenter. The assignment of the user bases to the data centers also depicted in the final simulation results as shown in Fig 11 and fig 13. These experiments shows that Service Proximity based routing algorithm always it selects the closest datacenter and performance optimised algorithm

selects If least response time data center is the closest datacenter then it selects the closest datacenter else selects closest data center and datacenter with the least response time with a 50:50 chance.

Fig 14 shows the results of data center loading .Here UB1,UB2,UB3 user bases are in the region 1,2 and 3 respectively. The SLA requirement for UB1 is request can be executed in any region other than 1 and 3, UB2 request can be executed in any region other than 2 and 4 and there is no restriction of data centers for userbase UB3. The results in Fig 14 and Fig 15 shows that the UB1 region is 1 and closest are data centers are DC1 and DC2 , requests are executed in region 3 by the data centers DC3 and DC4 and satisfies the given SLA. The SLA requirement for UB2 is request can be executed in any region other than 2 and 4.The results in Fig 14 and Fig 15 shows that though UB2 region is 2 and closest are data centers are DC3 and DC4 , requests are executed in region 1 by the data center DC1 and DC2 . Here cost of VM$/Hr of data center of DC1 is more than DC2. Therefore majority of the requests are executed in DC2. Since there is no restrictions on the user base UB3 , results shows that it was executed in the closest data centers DC3 and DC4. Here the cost of VM$/Hr of data centers are same and the fig 14 shows that the load is equally distributed between the data centers. The assignment of the user bases to the data centers also depicted the final simulation results as shown in Fig 15

4. CONCLUSION

Scheduling is one of the most important task in cloud computing environment. In this paper we have explained different types of scheduling and analyzed various service broker algorithms and compared its data center loading and assignment of user base requests to datacenter. For assigning the requests the algorithm uses different parameters like closest path, performance and location of the resource etc.

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