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Cloud Computing Ambiance using Secluded Access Control Method
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 12 | Dec-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1054 Cloud Computing Ambiance Using Secluded Access Control Method Ms. A. Sivasankari1, Ms. P.Bhuvana2, Ms.Arunkumari.G3 1Head of the Department (cs), Dept of Computer Science and Applications, D.K.M. College for Women (Autonomous),Vellore, Tamilnadu, India. 2Dept of Computer Science and Applications, D.K.M. College for Women (Autonomous), Vellore, Tamilnadu, India. 3Assistant professor, Dept of Computer Science and Applications, D.K.M. College for Women (Autonomous), Vellore, Tamilnadu, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – Cloud computing has considerably reduced the computational and storage costs of outsourced data. The existing access control techniques offer users access provisions centered on the frequent user attribute like role, which reduce the fine grained admission calculate. The storage space CorrectnessandFinegrainedAccessProvision (SCFAP) scheme,whichprovidestheuseran exclusiveaccess through the use of a hierarchical formation which is a combination of users’ single and widespread attribute. Also, we deploy the concept of voucher yielding system that allows the users to authenticate the correctness of outsourced data without the retrieval of the respective files. The tokens are derived from the metadata containing file position that helps in the process storage correctness verification and improvises the storage efficiency. The untried results show SCFAP has superior storage efficiency and error recovery measures than existing techniques. Keywords: Access control, access formation, barrier limits, storage efficiency, token granting system. 1. INTRODUCTION Data Centers today cater to a wide Diaspora of applications, with workloads varying from data science batch and streaming applications to decodinggenomesequences.Each application can have different syntax and semantics, with varying I/O needs from storage. With highly sophisticated and optimized data processing frameworks, such as Hadoop and Spark, applications are capable of processing large amounts of data at the same time. Dedicating physical resources for every application is not economically feasible. In cloud environments,withtheaidof server and storage virtualization, multiple processes contend for the same physical resource (namely, compute, network and storage) iscausescontentions.In-ordertomeet their service level agreements (SLAs), cloud providers need to ensure performance isolation guarantees for every application. With multi-core computing capabilities, CPUs have scaledto accommodate the needs of “Big Data”, but storage still remains a bottleneck. e physical media characteristics and interface technology are mostly blamed for storage being slow, but this is partially true. Full potential of storage devices cannot be harnessed till all the layers of the I/O hierarchy function efficiently. Performance of storage devices depends on the order in which the data is stored and accessed. Therefore, in large scale distributed systems (“cloud”), data management plays a vital role in processing and storing pet bytesofdata among hundreds of thousands of storage devices. e problems associated due to the in efficiencies in data management get amplified in multi-tasking, and shared Big Data environments. Despite advanced optimizations applied across various layers along the odyssey of data access, the I/O stack still remains volatile. Linux OS (Host) block layer is the most critical part of the I/O hierarchy as it orchestrates the I/O requests from different applications to the underlying storage. e key to the performance of the block layer is the Block I/O scheduler, which is responsible for dividing the I/O bandwidth amongst the contending processes as well as determines the order of requests sent to storage device. Unfortunately, despite its significance, the block layer, essentially the block I/O scheduler hasn’t evolved to meet the volume and contention resolution needs of data centers experiencing Big Data workloads. We have designed and developed two Contention Avoidance Storage solutions in the Linux block layer, collectively known as “BID: Bulk I/O Dispatch”, specifically to suit multi-tenant, multitasking Big Data shared resource environments. Big Data applications use data processing frameworks such as Hadoop Map Reduce, which access storage in large data chunks (64 MB HDFS blocks,) therefore exhibitingevidentsequential.Dueto contentions amongst concurrent I/O submitting processes and the working of the current I/O schedulers, the inherent sequential of Big Data processes is lost. The processes may be instances of the same application or belong to other applications. contentions result into unwanted such as multiplexing and inter leavings, thereby breaking of large data accesses. Increase in latency of storage In the first solution, we propose a dynamically adaptable Block I/O scheduling scheme BID-HDD, for disk based storage. BID-HDD tries to recreate the in I/O access in order to provide performance isolation to each I/O submitting process. Rough trace driven simulation based experiments
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 12 | Dec-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1055 with cloud emulating Map Reduce benchmarks, we show of BID -HDD which results in 28–52% I/O time performance gain for all I/O requests than the best performing Linux disk schedulers. With recent developments in NVMe (non-volatile memory) devices such as solid state drives (SSDs), commonly known as storage class memories (SCM) , with supporting infrastructure, and, virtualization techniques, a hybrid approach of using heterogeneous tiers of storage together such as those having HDDsandSSDscoupledwith workload- aware tier to balance cost, performance and capacity have become increasingly popular. Inthesecondpart,we propose a novel hybrid scheme BID-Hybrid to exploit SCM’s (SSDs) superior random performance to further avoid contentions at disk based storage. The main goal of BID-Hybrid is to further enhance the performance of BID-HDD scheduling scheme, by interruption causing non-bulky I/Os to SSD and thereby making the “HDD request queue”availablefor bulky and sequential I/Os. Contrary to the existing literature of tier, where data is tiered based on deviation of adjacent disk block locations in the device “request queue”, BID-Hybrid profiles process I/O characteristics (bulkiness) to decide on the correct candidates for tier. Current literature might cause unnecessary deportations to SSDs, due to M/Os from an application, which might be sequential but appear random due to the contention by otherapplicationsinsubmittingI/O to the “request queue”. While BID-Hybrid uses staging capabilities and anticipation time for judicious and verified decisions. BID-Hybrid serves I/Os from bulky processes in HDD and tiers I/Os from non-bulky (lighter) interruption causing processes to SSD. BID-Hybrid is successfully able to achieve its objective further reducing contention at disk based storage device. BID Hybrid results in performance gain of 6–23% for Map Reduce workloads over BID-HDD and 33– 54%overthe best performing Linux scheduling schemes. 2. BACKGROUND Hadoop Map Reduce working and workload characteristics and Requirements from a block I/O scheduler in Big Data deployments sections discuss the I/O workload characteristics of Hadoop deployments and the requirements from a I/O scheduler in such environments, respectively. “Issues with current I/O schedulers” section describes the working of the current state-of-the-art Linux disk schedulers deployed in shared Big Data infrastructure. 3. WORKING AND WORKLOAD CHARACTERISTICS Hadoop Map Reduce is the defect large data processing framework for Big Data. Hadoop is a multi-tasking system which can process multiple data sets for multi-jobs in a multi-user environment at the same time. Hadoop uses a block-structured file system, known as Hadoop Distributed File System (HDFS). HDFS splits the stored files into fixed size (generally 64 MB/128 MB) file system blocks, knownas chunks, which are usually tri-replicated across the storage nodes for fault tolerance and performance. Hadoop is designed in such a way that the processes access the data in chunks. When a process opens a file, it reads/writes in multiples of these chunks. Enterprise Hadoop workloads have highly skewed characteristics making the profiling tough with the “hot” data being really large. Us, the effect of file system caching is negligible in HDFS. Most of the data access is done from the underlyingdisk (orsolidstate)based storage devices. Therefore, a single chunk causes multiple page faults, which eventually would result in creation and submission of thousands of I/O requests to the block layer for further processing before dispatching them to the physical storage. Each Map Reduce application consists of multiple processes submitting I/Os concurrently, possibly in different interleaving stages, i.e. Map.Reduce, eachhavingskewedI/O requirements. Moreover, these applications run on multi- tenant infrastructure which is shared by a wide of such applications, each having different syntax and semantics. For Big Data multi-processing environments, although the requests from each concurrent process results into large number of sequential disk accesses, they face contention at the storage interface from other applications. These contentions are resolved by the OS Block Layer, more essentially the I/O scheduler. e inherent sequential operations of applications becomes non-sequential due to the working of the current disk I/O schedulers, which thereby result into unwanted like multiplexing and interleaving of requests is also results in higher CPU wait/idle time as it has to wait for the data. In order to pro- vide performance isolation to each process as well as improve system performance, it is imperative to remove or avoid contentions.“Issues with current I/O schedulers” section describes the working of the currentstate-of-the-art Linux disk schedulers deployed in shared Big Data infrastructure. In the next section, we discuss the requirements of a block I/O scheduler most suited for Hadoop deployments. 4. REQUIREMENTS FROM A BLOCK I/O SCHEDULER IN BIG DATA DEPLOYMENTS The key requirements from a block I/O scheduler in multiprocess shared Big Data environments,suchasHadoop Map Reduce are as follows: Capitalize on large I/O access: Data is accessed in large data chunks (64/128 MB in HDFS), whichhavea highdegree of sequential in the storage media. I/O scheduler should be
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of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 12 | Dec-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1056 able to capitalize on large I/O access and should not break these large sequential requests. Adaptive: Multiple CPUs (or applications) try to access the same storage media in a shared infrastructure, which causes skewed workload patterns. Additionally, each Map Reduce task itself has varying and interleaving I/O characteristicsin its Map, Reduce and phases. Therefore it is imperativefor an I/O scheduler to dynamically adapt to such skewed and changing I/O patterns. Performance isolation: In-order to meet the SLAs, it is highly imperative to provide I/O performance isolation for each application. For ex: A single Map Reduce application consists of multiple of tasks, each consisting of multiple processes, each having different I/O requirements. Therefore, an I/O scheduler through process-level segregation should ensure I/O resource isolation to every I/O contending process. Regular I/O scheduler features Reducing CPU wait/idle time by serving blocking I/ Os (reads) quickly; avoid starvation of any requests; improve to reduce disk arm movements. Issues with current I/O schedulers Since version 2.6.33, Linux currently employs three disk I/O Schedulers namely Noop, Deadline and Completely Fair Queuing CFQ.As observed in “Linux I/O stack” section, the main functionalities of the block I/O schedulers are as follows:Lifecycle Management of the block I/O “requests” (which may consist of multiples of BIO structures) in the “request queue”. Moving requests from “request queue” to the “dispatch queue”.e dispatch queue is the sequence of requests ready to be sent to the block device driver. HDDs form the backbone of data centers storage. The effect of caching is negligible in an enterprise Big Data environment. Therefore large numbers of page faults occur, which in turn result in most of the data accesses from the underlying storage. Hence, it is imperative to tune the data management software stack to harness the complete potential of the physical media in highly skewed and multiplexing Big Data deployments. The block layer is the most performance critical component to resolve disk I/O contentions along the odyssey of I/O path. Unfortunately, despite its significance in orchestrating the I/O requests, the block layer essentially the I/O Scheduler has not evolved much to meet the needs of Big Data. We have designed and developed two ContentionAvoidance Storage solutions, collectively known as “BID: Bulk I/O Dispatch” in the Linux block layer specifically to suit multi- tenant, multitasking shared Big Data environments. In the first part of this section, we propose a Block I/O scheduling scheme BID-HDD for disk based storage. BID-HDD tries to recreate the sequential in I/O access in order to provide performance isolation to each I/O submitting process. In the second part, we propose a hybrid scheme BID-Hybrid to exploit SCM’s (SSDs) superior random performance to further avoid contentionsatdisk basedstorage.Inthehybrid approach, dynamic process level profiling in the block layer is done for deciding the candidates for tiertoSSD. Therefore, I/O blocks belonging to interruption causing processes are to SSD; while bulky I/Os are served by HDD. BID-HDD scheduling scheme is used for disk request processing and multi-q FIFO architecture for SSD I/O request processing. BID schemes are designed taking into consideration the requirements laid out earlier in “Requirements from a block I/O scheduler in Big Data deployments” section. BID as a whole is aimed to avoid contentions for storage I/Os following system constraints with-out compromising the SLAs. BID-HDD aims to avoid multiplexing of I/O requests from different processesrunningconcurrently.Toachievethis,we segregate the I/O requests from each process into containers. The idea is to introduce dynamically adaptable and need-based anticipation time for each process, i.e. “time to wait for adjoining I/O request”. is allows coalescing of the bulky data accesses and avoid starvation of any requests. Each process container has a wait timer, based on inter arrival time of requests and deadline associated with it. Due to physical limitation of HDDs, therehave been recentto incorporate fash based high-speed, non-volatile secondary memory devices, known as SCMs in data centers. Despite superior random performance of SCMs (or SSDs) over HDDs, replacing disks with SCMs completely for data center deploymentsdoesn’t seemtobefeasibleeconomically as well as due to other associated issues. With recent developments in NVMedevices,withsupporting infrastructure, and, virtualization techniques, a hybrid approach of using heterogeneous tiers of storage together such as those having HDDsandSSDscoupledwith workload- aware tier to balance cost, performance and capacity have become increasingly popular. Data centers consist of many tiers of storage devices. All storage devices of the same type form a tier. For example: all HDDs across the data-center form the HDD tier and all SSD form SSD tier, and similarlyfor other SCMs. Based on profiling ofworkloads,balancedutility value of data usage, the data is managed between the tiers of storage for improved performance. Workload aware Storage Tier or simply Tier istheautomatic classification of how data is managed between heterogeneous tiers of storage in enterprise data center environment. It is vital to develop automated and dynamic tier solutions to utilize all the tiers of storage. BID-Hybrid aims to deliver the capability of dynamic and judicious automated tier in the block layer as a SDS solution.
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of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 12 | Dec-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1057 5. RELATED WORKS The domain of storage technologies has been an active field of research. More recently, there has been research inclination in developing both, the software as well as physical architecture of NVMe, referred to as SCMs to meet the SLAs of Big Data. We broadly classify theliteratureinour focus into: (a) Block layer developments, mostly I/O Scheduling, and (b) Multi-tier storage environment. Table 4 mentions state- of-the-art solutions in both these classifications. 6. BLOCK LAYER DEVELOPMENTS,MOSTLYI/O SCHEDULING In this section, we discuss the developments in the block layer, concentrating mostly on I/O Scheduling. I/O Scheduling has been around since the beginning of disk drives, though we will limit our discussion to those approaches which are relevant to recent developments. Despite advanced optimizations applied across various layers along the odyssey of data access, the Linux I/O stack still remains volatile. e block layer hasn’tevolvedtocaterthe requirements of Big Data. One of the major findings was in establishing relationships between performance and block I/O scheduler.Ourwork on BID-HDD is an in this domain especially for rotation based recording drives. BID is essentially a contention avoidance technique which can be modeled to cater differentobjective functions (storage media type, performance characteristics, etc.).The provides a brief overview of the Linux block layer, basic I/O units, request queue processing, etc.ADproposesa framework which studies the VM interference in Hadoop virtualized environments with the execution of single Map Reduce job with several disk pair schedulers. It divides the Map Reduce job into phases and executes series of experiments using a heuristic tochoosea disk pairscheduler for the next phase in a VM Environment. BORG is a self- optimizing HDD based solution which reorganizes blocks in the block layer by forming sequences via calculating correlation amongst LBA ranges with connectivity based on frequency distribution and temporal locality. It makes weighted graphs and relocation of blocks happens to most needed vertex first. e goal is to service most requests from dedicated zones of a HDD. Multi-q is an important piece of work which extends the capabilities of the block layer for utilizing internal parallelism of SSDs to enable fast computation for multicore systems. It proposes changes to the existing OS block layer with support for multiple software and hardware queues for a single storage device. Multi-q involves a software queue per CPU core. Similar lock contention scheme can be usedforBID,asitalso involves multiple queues. CFFQ is an SSD extension of CFQ scheduler in which each process has a FIFO request queue and the I/O bandwidth is fairly distributed in round robin fashion. SLASSD and Kim et al. propose to ensure diverse SLAs, including reservations, limitations, and proportional sharing by their I/O Scheduling schemes in shared VM environment for SSDs. While SLASSD uses an opportunistic goal oriented block I/O scheduling algorithm, Kim et al. proposes host level SSD I/O schedulers, which are extensions of state-of -the-art I/O scheduling scheme CFQ. Big Data cloud deployments due to the highly skewed, non- uniform and multiplexing workloads prediction of utility value of blocks for tier based on heat of data might not be a viable option. 6. CONCLUSION AND FUTURE WORKS WehavedevelopedanddesignedtwonovelContention Avoidance storage solutions, collectively known as “BID: Bulk I/O Dispatch” in the Linux block layer, specifically to suit multi- tenant, multi-tasking and skewed sharedBigDatadeployments. rough trace-driven experiments using in-house developed system simulators and cloud emulating Big Data benchmarks, we show the effectiveness of both our schemes. BID- HDD, which is essentially a blockI/Oscheduling schemefordisk based storage, results in 28–52%lessertimeforallI/Orequests than the best performing Linux disk schedulers. BID-Hybrid, tries exploit SSDs superior random performance to further reduce contentions at disk based storage. BID-Hybrid is experimentally shown to be successful in achieving 6– 23% performance gains over BID-HDD and 33–54% over best performing Linux scheduling schemes. In future, it would be interesting to design a system with BID schemes for block level contention management coupled with self-optimizing block re-organizationofBORG, adaptive data migration policies of ADLAM, and replication- management of such as Triple-H. is could solve the issue of workload and cost-aware tiering for large scaledata-centers experiencing Big Data workloads. Broader impact of this research would aid Data Centers in achieving their SLAs as well keeping the TCO low. Apart from performance improvements of storage systems, the over-all deployment of BID schemes in data centers would also lead to energyfootprintreductionandincreasein lifespan expectancy of disk based storage devices.
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of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 12 | Dec-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1058 7. REFERENCES 1.Krish K, Wadhwa B, Iqbal MS, Rafique MM, Butt AR. On efficient hierarchical storageforbigdata processing.In:2016 16th IEEE/ACM international symposium on cluster, cloud and grid computing (CCGrid). New York: IEEE; 2016. p.403– 8. 2. Nanavati M, Schwarzkopf M, Wires J, Warfield A.Non- volatile storage. Queue. 2015;13(9):20–332056. 3. Mittal S, Vetter JS. A survey of software techniques for using non-volatile memories for storage and main memory systems. IEEE Trans Parallel DiatribeSyst.2016;27(5): 1537–50. 4.Love R. Linux Kernel development. 2010. p. 1–300. https://rlove.org/. Accessed 31 Mar 2017. 5.Avanzini A. Debugging Fanatic, Linux and Xenenthusiast. BFQ I/O scheduler. http://ari- ava.blogspot.com/2014/06/opw-linux-block-io-layer-part- 1-base.html.Accessed 15 Apr 2016. 6. Vangoor BKR, Tarasov V, Zadok E. To fuse or not to fuse: performance of user-space file systems. In: Proceedings of FAST’17: 15th USENIX conference on file and storage technologies. 2017. p. 59. 6. Aghayev A, Ts’o T, Gibson G, Desnoyers P. Evolving ext4 for shingled disks. 2017. 7. Arpaci-Dusseau RH, Arpaci-Dusseau AC. Operating systems: three easy pieces, vol. 151. 2014. 8. Moon S, Lee J, Sun X, Kee Y-S.Optimizing the hadoopMapReduce framework with high-performance storage devices.J Supercomput. 2015;71(9):3525–48. 9. Eshghi K, Micheloni R. Ssd architecture and pci express interface. In: Inside solid state drives (SSDs).2013.. 10.Yang Y, Zhu J. Write skew and zipf distribution: evidence and implications. Trans Storage. 2016;12(4):21– 12119. 11.Roussos K. Storage virtualization gets smart. Queue.2007;5(6):38–44. 12. Dean J, Ghemawat S. MapReduce: simplified data processingonlargeclusters. CommunACM.2008;51:107–13 13. White T. Hadoop: the definitive guide. 2012. p. 1– http://hadoopbook.com/. Accessed 31 Mar 2017.
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