Implementation and Validation of the Optimized Deduplication Strategy in Federated Cloud Environment

Nipun Chhabra; Manju Bala; Vrajesh Sharma

doi:10.32604/cmc.2022.021797

I. K. Gujral Punjab Technical University, Jalandhar, 144603, India
*Corresponding Author: Nipun Chhabra. Email: nipunchhabra5@gmail.com
Received: 15 July 2021; Accepted: 16 August 2021

Abstract: Cloud computing technology is the culmination of technical advancements in computer networks, hardware and software capabilities that collectively gave rise to computing as a utility. It offers a plethora of utilities to its clients worldwide in a very cost-effective way and this feature is enticing users/companies to migrate their infrastructure to cloud platform. Swayed by its gigantic capacity and easy access clients are uploading replicated data on cloud resulting in an unnecessary crunch of storage in datacenters. Many data compression techniques came to rescue but none could serve the purpose for the capacity as large as a cloud, hence, researches were made to de-duplicate the data and harvest the space from exiting storage capacity which was going in vain due to duplicacy of data. For providing better cloud services through scalable provisioning of resources, interoperability has brought many Cloud Service Providers (CSPs) under one umbrella and termed it as Cloud Federation. Many policies have been devised for private and public cloud deployment models for searching/eradicating replicated copies using hashing techniques. Whereas the exploration for duplicate copies is not restricted to any one type of CSP but to a set of public or private CSPs contributing to the federation. It was found that even in advanced deduplication techniques for federated clouds, due to the different nature of CSPs, a single file is stored at private as well as public group in the same cloud federation which can be handled if an optimized deduplication strategy be rendered for addressing this issue. Therefore, this study has been aimed to further optimize a deduplication strategy for federated cloud environment and suggested a central management agent for the federation. It was perceived that work relevant to this is not existing, hence, in this paper, the concept of federation agent has been implemented and deduplication technique following file level has been used for the accomplishment of this approach.

Keywords: Federation agent; deduplication in federated cloud; central management agent for cloud federation; interoperability in cloud computing; bloom filters; cloud computing; cloud data storage

Cloud computing is a very progressive technology and, it is stretching its wings in all directions due to its most applaudable feature “pay-as-you-use” [1]. It can be broadly classified into three categories viz. Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) [2,3]. Infrastructure as a Service utility provides servers and storage on demand, hence deduplication strategies are employed on this service model. With the growing demand of cloud storage, heterogeneous service providers are coming together under one coalition known as Cloud Federation. Cloud Federation allows providers to share resources through Federation Level Agreements (FLA) covered under federation strategy and if any of the providers in federation is not able to meet the requirements, it is outsourced to other CSPs of federation. Moreover, resources which are being less utilized by any service providers can be leased to other federation members, leading to optimal usage of resources [4]. Despite the optimal utilization of storage and resources due to federation, replication of data consumes most of the space that ought to be eliminated to optimize the cloud storage capacity. To manage this issue, researchers presented many deduplication techniques but most of them were not able to provide an optimal solution to harvest waste storage from CSPs. Deduplication in federated clouds is a novel area to explore and has a lot of scope for researchers to render innovative strategies to garner the storage with reduced time for lookup operations. Third-party agents and brokers provide effective monitoring services that ensure that customers are getting the most out of their cloud environment.

This paper is structured into various sections for better presentation of the study. Section 2 entails a detailed literature survey over the advancement of cloud federation and potential of implementing deduplication in it. Section 3 presents the research gap and existing system while Section 4 confers the proposed system by implementing the concept of federation agent in optimized deduplication approach for federated cloud environment. In Section 5, observations have been recorded and discussions on results have been conducted. Section 6 concludes the paper and sheds light on the future scope of this work.

Recently, many researches are being conducted on interoperability in cloud computing and various deployment models under one coalition to make the optimal usage of the cloud resources. This literature survey has been divided into two sections to understand the progressive metamorphosis of cloud federation and deduplication.

In the modern context, having limited physical resources is the primary limitation of clouds. If a cloud has exhausted all the computational and storage resources, it cannot provide the service to its clients [5]. All such situations can be addressed by the Inter-Cloud for providing computational service, storage, or any kind of resources to the other clouds. Author in [6] proposed and established Service Level Agreement (SLA) between the service providers and consumers for accessing the resources in cloud federation. Federated cloud plays a major role and establishes a business deal where service provider can sell resources. Authors in [7] rendered Two-level Federations i.e., horizontal level and vertical level, where federation taking place at one level of the cloud is called horizontal level while vertical federation spans across multiple levels. Authors in [8] deliberated the prerequisites for federation architecture as Interface standards and a service broker which acts as a liaison between various standards and interfaces of CSPs. Author in [9] presented a novel concept for establishing a single common broker for all clouds participating in a federation. This acts a third party regulatory body that checks the belongingness of the cloud to the federation. Authors in [10] have defined the federation to be inter-clouds organization which should be dispersed geographically and must have a structured marketing system based on federal SLAs. Authors in [11] have termed components of this architecture as Cloud Coordinator, the Cloud Broker, and the Concentrator. Cloud Coordinator (CC) is a module that interacts with cloud brokers and other cloud coordinators. In the federation, it is the CC that deals with the broker during any event like scheduling of resources and manages the execution, in its domain. Cloud broker mediates between cloud coordinators and consumers and it is based on Service-Oriented Architecture. Its main task it to look for the services available in federated Clouds and employ them for the optimal benefit.

Authors in [12] have projected cloud federation as a mesh of different clouds which are brought together under open standards meant to offer a ubiquitous computing environment. In this decentralized system, policies are well defined under agreeable SLAs that become the foundation for multi-provider infrastructure to act as one entity. Authors in [13] have envisioned for the popularity of cloud computing to be essential for day to day life. In this paper [14] for managing, creating and using identities in the cloud infrastructure a provision has been proposed and named as Federated Cloud Identity management where an application or user is recognized by its credentials. Authors in [15] proposed the management of cloud storage which is heterogeneous in nature and propounds deduplication management and access control. It proves to be a very flexible scheme and can adapt to different scenarios and establishes economic principles.

With the increased hand held electronic devices in the market and pervasive internet access, gigantic amount of data is being generated which is stored at various cloud storages. Mostly it is the same data being replicated at and from various locations. Even the regular backups which are maintained at organizations and the identical files created by different departments of an organization lead to data replication which further results in wastage of storage space. The technique through which only a single instance of data is stored while a logical references of this single copy of data is passed as and when required in future, to avoid the storage wastage, is known as deduplication. Categorization of deduplication techniques is done on the basis of time, location and granularity. File level or block level deduplication is observed under granularity based deduplication. Source side and destination side deduplication are categorised under location based and deduplication can be post process or inline process if implemented in reference to time [16]. For data access control in cloud environment [17] authors have proposed to employ client side encryption for the data security across the network. It was mentioned that with the increased amount of data being stored at cloud storages, to perform deduplication on encrypted data was not possible and the solution fall flat. To overcome this issue Message Locked Encryption technique [18] came out as a solution and subsequently it evolved into Convergent Encryption. As CE suffered from Brute force attack in [19] authors have further proposed DupLESS technique in which users encrypt their data using the keys obtained from a Key Server (KS). Some data owners don’t let third party (KS) to manage their data. Splitting of CE and sharing it into multiple CSPs was presented by Li et al. [20]. Cross-user deduplication scheme was proposed by authors in [21] which involved client-side encryption by applying a password authenticated key exchange protocol without any additional independent servers. Secure data deduplication technique was proposed by authors in [22] where AES algorithm and MD5 were used. Hybrid data deduplication mechanism was proposed by Fan et al. [23], where both storage and bandwidth utilization can be improved by source-based approach. For confidentiality of data, a secret sharing technique has been proposed by authors in [24] to encode fragmented data. This secret share shall be granted to the authorized users only that can claim the ownership of the data. Content-identified convergent encryption technique was proposed by authors in [25]. Client controlled deduplication scheme was proposed in [26] that addresses the issues in deduplication from client side. An advanced technique for lookup operations was proposed by Burton Howard that used a probabilistic data structure for checking the membership of an element. This time and space efficient method does not yield any false negatives but may return some false positives [27]. Authors in [28] presented a review on various data deduplication techniques. From the deep study of technical literature, it was observed that with the increased usage of computing devices the plead of storage and computing resources on cloud increased exponentially, which brought many CSPs together to form a federation of clouds. With this increased storage space, users started storing several copies of data that made deduplication a necessity to garner duplicated storage. Moreover, the above schemes cannot flexibly manage data deduplication in various situations and across multiple CSPs.

The literature survey revealed that many policies have been devised for deduplication in public and private cloud deployment models with various hashing techniques. Owing to the need for load sharing in cloud computing, interoperability has included many CSPs which are bound by Federation Level Agreements (FLA), either private or public under an alliance known as Federated Cloud. Therefore, during deduplication the search for duplicate copies is made in all the participating CSPs, whether private group or public group, instead of single group. Also, in the optimized deduplication technique in federated clouds, due to the different nature of CSPs, a single file is being stored at private group as well as public group in the same cloud federation which can be further optimized if the central management of the federation is possible. Deep study of technical literature suggests that it has a lot of potential for further research, as not much work has been done, leading to a huge research gap in this field and hence there is enough scope for further research.

In the existing system (as shown in Fig. 1), encryption technique is used for access control followed by deduplication using hashing, for lookup operations, in private and public cloud environment.

Upon assessing the existing system, it was concluded that a better policy for deduplication can be devised by deploying bloom filters for checking the membership of an element in federated cloud environment instead of public/private cloud groups [29]. This probabilistic data structure (bloom filters) proves very beneficial in the look up operation and brings results in relatively shorter time duration than hashing. In this optimized deduplication strategy three public CSPs and two private CSPs were included in one federation and bloom filters were employed for searching a file in the federation. The proposed strategy establishes two principles as given below:

a) The same file can be stored only once from the same user in case of Private CSPs, whereas in Public CSPs it can be stored once only irrespective of the user, as a reference can be passed to all the other entries.

b) On deleting a file which has many references in public CSPs, only a logical pointer is deleted for that particular user not the original file.

The proposed optimized deduplication strategy yields excellent results and harvests storage from duplicated data by saving a unique file in Private CSPs and a single copy of a file in Public CSPs. Moreover, by implementing bloom filters, in addition to the space, the total time for lookup operations has also reduced.

Though, the previously proposed system (optimized data duplication strategy for federated cloud environment using Bloom Filters) had shown exceptional results and harvested memory from the cloud storage while decreasing the total time during lookup operations, still, this system can be advanced to gain more optimization in deduplication. We have seen that in proposed system one unique file can be saved in Private Clouds group (CSP1 & CSP2) and the same file can also be saved in the Public Clouds group (CSP3, CSP4, CSP5). Therefore, even in the same federation, due to different nature of CSPs, a single file is being stored twice, once in private group and then in public group, in the same cloud federation.

Deep analysis of technical literature suggests that if the central management of the federation is governed by one agent that keeps the check for every entry in any CSP in one federation, this issue can be managed and the agent can be referred as Federation Agent (as shown in Fig. 2). Federation Agent records every entry in the federation management table and further the lookup operations are performed on this federation management table instead of two separate tables as the case was for the previously proposed system. This can be seen in the Tab. 5 (given ahead) where file ‘f1’ is stored only one time and for the other times only a reference is passed instead of the saving the same file again and again. The Comparative analysis of the existing system and proposed system has been tabulated in Tab. 1 as given below:

Figure 2: Diagrammatic representation of federated clouds with federation table and federation agent

An optimized data duplication strategy has been proposed and the methodology for the events has been given as below:

1. Simulation is initialized by starting CloudSim 3.0.3 package that creates the datacenter broker, virtual machines, cloudlets and Federation Agent.

where Dn is number of devices, Nbw is Network bandwidth, Dm is the Deployment Model and Br is the Broker.

Storage be a set of elements represented as Storage = {fa….fm} where fa to fm are set of files stored in datacenter.

For an instance any file (fn) belonging to any User (Un) can be represented as Unfn

2. Option 1: Private access: When an authorized user signs-in in a chosen Private CSP, its users’ credentials are used to encrypt the selected file and this encrypted file is sent to the server.

After Logging in by user U1, a key is generated based on his attributes U1 → keyG

The encrypted file Enc(f1) is transferred to cloud server and then a hash value is computed Hash(Enc (f1))

Using Bloom Filters for checking membership of an element, BF(). This function contains set of elements from 0 to n−1 where n is length of an array.

For deduplication using Bloom Filters, a lookup operation is conducted against generated hash.

FA.update (&reference (f1)) //‘&reference’ is passed instead of saving the file

Option 2: Public Access: When an authorized user logs-in in the selected Public CSP, the name of the file which is to be uploaded is sent to the server where a key is generated and finally this key is sent back to the client.

After Logging in by Anonymous (Public) user, a file f1 is selected for uploading

This KeyH is used to encrypt the file fi and transferred to cloud server where a hash value is computed.

Using Bloom Filters for checking membership of an element, BF() For 0 to n−1 where n = length of the array

For deduplication using Bloom Filters, lookup operation is conducted against generated hash.

3. Federation Agent FA(), which feeds on Bloom Filters BF(), searches the file in the federation table and checks for the replicated file.

The file can be Hash(Enc(f1)) in case of Private CSPs or Hash(Enc(KeyH(f1)) in case of Public CSPs represented as Unfn.

Unfn ⊆ FA and ‘&reference’ is updated in the status instead of again saving the file

4. If the file doesn’t exist then a new file is stored otherwise a logical reference is passed.

4.3 Pseudocode for the Optimized Data Duplication Strategy Through Federation Agent

Step1: Initialize the cloudsim 3.0.3 and create datacenter broker, virtual machines and cloudlets.

Step 4: A key ‘KeyG’ is generated. //Authentication of user is checked from the server side

Step 6: The selected file is encrypted and encrypted code E(f1) is generated using a KeyG.

Step 7: This encrypted file E(f1) is transferred to cloud server and then a hash value is computed

Step 10: A key ‘KeyH’ is generated for received file //User Authentication is checked from the server side

Step 12: This encrypted file E(f1) is transferred to cloud server and a hash value is computed H(E(f1))

Experimental results of the proposed system are stated in Tab. 2 and the diagrammatic representation of the proposed system has been given in the Fig. 3, given below:

Figure 3: Diagrammatic representation of the optimized deduplication strategy, in federated cloud with federation agent

Actions performed during deduplication in federated clouds using Federation Agent as shown in the Tab. 2, are given below:

i. When a user ‘User1’ tries to upload file1 with hash code #abc for the first time on private cloud service provider ‘CSP1’, the file1 is uploaded/stored and the status is shown as ’Stored’.

ii. When a user ‘User2’ tries to upload file1, with hash code #abc, at private cloud service provider CSP1, then instead of saving the same file again the reference to file1 is passed and the status of action is updated as ‘&Reference’.

iii. When a user ‘User1’ tries to upload file1, with hash code #abc, at private cloud service provider CSP1, the action status is updated as ‘Denied’ as the same file already exists at CSP1 with same user (User1).

iv. When a user ‘User1’ tries to upload file1, with hash code #abc, at private cloud service provider CSP2, then instead of saving the same file again the reference to file1 is passed and the status of action is updated as ‘&Reference’.

v. When a user ‘User1’ tries to upload file2, with hash code #def, for the first time at private cloud service provider CSP1, the file2 is uploaded/stored and status of the action is shown as ‘Stored’.

vi. When a public user tries to upload file3, with hash code #ghi, for the first time at public cloud service provider CSP3, the file3 is uploaded/stored and status of action is shown as ‘Stored’.

vii. When a public user tries to upload file1, with hash code #abc, at public cloud service provider CSP3, then the reference to file1 is passed and the action status as ‘&Reference’ is updated.

viii. When a public user tries to upload file2, with hash code #def, at public cloud service provider CSP3, then the reference to file2 is passed and the action status as ‘&Reference’ is updated.

ix. When a public user tries to upload file1, with hash code #abc, at public cloud service provider CSP4, then the reference to file1 is passed and the action status as ‘&Reference’ is updated.

By implementing Federation Agent, which is centrally managing all the transactions in common federation table, it becomes well aware about the existence of any file in any of its participating CSPs, either Private or Public. As a result, it stores a single copy of each file and only the reference is passed to all the other transactions where the same file is under consideration.

The outcomes of the proposed system are suggesting that this strategy is very beneficial in harvesting the cloud storage by removing the duplicated data as shown in the Tab. 3 for Private CSPs & Tab. 4 for Public CSPs, given ahead:

As shown in the Tab. 3, before applying any deduplication strategy, the total memory needed to store the above data was 600 kbs. After applying the proposed deduplication policy, the storage requirement reduces to 400 kbs for the same data and 200 kbs of memory is saved.

As shown in the Fig. 4 a graphical (3-D Cluster-Column) representation of the simulation results for memory optimisation in private storage, the total memory consumption for the set of files used in the existing private storage was 600 kbs and for the same set of files with proposed deduplication strategy the memory requirement was 400 kbs. It empirically proves that the proposed system is harvesting 33.3% of memory from redundant storage in Private CSPs of Federated clouds.

Figure 4: A graphical representation of the simulation results for memory optimization in private storage

As shown in the Tab. 4 for public CSPs, after applying the proposed strategy the memory requirement was reduced to 800 kbs which was otherwise 1300 kbs.

As shown in the Fig. 5 a graphical (3-D Cluster-Column) representation of the simulation results for memory optimization in public storage, the total memory consumption for the set of files used in the existing public storage was 1300 kbs and for the same set of files with proposed deduplication strategy the memory requirement was 800 kbs. It indicates that the proposed system is conserving 38.46% of memory from redundant storage in Public CSPs of Federated clouds.

Figure 5: A graphical (3-D Cluster-Column) representation of the simulation results for memory optimization in public storage

As shown in the Tab. 5, after using Federation agent, it was observed that 1100 kbs of memory is saved which is 400 kbs more as compared to the system without Federation Agent in the Federated cloud environment. Moreover, as all the transactions are recorded in one federation table, lookup operation also takes lesser time than the system without federation agent.

As shown in the Fig. 6 a graphical (3-D Cluster-Column) representation of the simulation results for memory optimization in proposed system with federation agent, the total memory consumption for the set of files used in the existing private and public storage was 1900 kbs and for the same set of files with proposed deduplication strategy the memory requirement was 1200 kbs. After further optimization with the federation agent, the memory requirement for the same set of file decreased to 800 kbs which indicates that the proposed system with federation agent is conserving 57.89% of memory from redundant storage in federated cloud storage as compared to the existing system.

Figure 6: A graphical (3-D Cluster-Column) representation of the simulation results for memory optimization in proposed optimized deduplication strategy with federation agent

This paper presents the concept of Federation Agent to mollify the meagerness of the existing system and to further improve the data duplication strategy in cloud environment. Federation Agent is centrally managing all the transactions in common federation table and is well aware about the existence of any file in any of its participating CSPs, either Private or Public. The simulation of the proposed strategy has been performed on a cloud simulation tool, CloudSim 3.0.3, for implementing and testing the algorithm. The outcomes of the proposed system are suggesting that this strategy is very beneficial in harvesting the cloud storage by removing the duplicated data and conserving considerable amount of memory. It has been empirically proven that the system without Federation Agent is harvesting 33.3% memory from Private CSPs and 38.46% from Public CSPs than existing system, whereas, the proposed system with Federation Agent is conserving 57.84% cloud storage. In this study, file level deduplication technique has been used in the proposed system, in future, more research can be done on block level deduplication techniques in federated cloud environment. In addition to this, more alternatives can be sought for better indexing and faster lookup operations for deduplication in federated clouds.

Acknowledgement: This paper and research behind it would not have been possible without the exceptional support of my supervisor and research colleagues.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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Computers, Materials & Continua DOI:10.32604/cmc.2022.021797
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