Hash Partition Approach for Improving theEfficiency of Key Value Architecture usingMapReduce

DOI : 10.17577/IJERTV8IS020043
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Hash Partition Approach for Improving the Efficiency of Key Value Architecture using MapReduce


M. Tech Student,

Department of CSE, SSJ Engineering College, Hyderabad, Telangana, India.

A. Ravi Kumar2

Associate Professor,

Department of CSE, SSJ Engineering College, Hyderabad, Telangana, India

Dr. G. Anil Kumar3

Professor, Department of CSE, Sridevi Womens Engineering College, Hyderabad, Telangana, India


In the time of BigData, huge measures of organized and unstructured information are being made each day by a large number of everpresent sources. BigData is confused to work with and needs greatly parallel programming executing on countless. MapReduce is a present programming model that makes less complex composition circulated applications which control BigData. Keeping in mind the end goal to make MapReduce to work, it needs to separate the workload between the PCs in the system. Accordingly, the execution of MapReduce vivaciously relies upon how reliably it circulates this investigation stack. This can be a challenge, especially in the landing of information skew. In MapReduce, workload distribution relies upon the calculation that segments the information. How reliably the partitioner disseminates the information relies upon how tremendous furthermore, appoint the example is and on how solid the examples are inspected by the apportioning strategy. This investigation suggests an upgraded dividing calculation utilizing adjusted key apportioning that advances stack adjusting and memory use. This is finished by means of an upgraded examining calculation and partitioner. To assess the proposed calculation, its execution was looked at against a cutting edge apportioning component utilized by TeraSort. Experimentations exhibit that the proposed calculation is faster, more memory productive and more precise than the existing execution.

Keywords Hadoop, Hash Code, Partitioning, MapReduce


    Over the previous decades, PC innovation has turn out to be progressively universal. Registering gadgets have various uses and are basic for organizations, researchers, governments, engineers and the regular shopper. What every one of these gadgets have when all is said in done is the plausible to deliver information. Generally, information can arrive from all over the place. The greater part kinds of information have a penchant to have their own particular unmistakable arrangement of qualities far beyond how that information is scattered.

    Information that isn’t analyzed or used has little criticalness and can be a waste and assets. Despite what might be

    expected, information that is executed on or inspected can be of immense esteem. The information itself might be as well immense to store on a solitary PC. Therefore, all together to diminish the time it takes to execute the information and to have the storage room to store the information, programming engineers need to record programs that can perform on at least 2 PCs and apportion the workload among them. While conceptually the calculation to execute might be direct, customarily the execution has been confounded. In response to these greatly same issues, engineers at Google constructed up the Google File System (GFS) as expressed by (Ghemawat et al., 2003), a dispersed record framework outline portrayal for real information preparing and shaped the MapReduce programming model by (Dean and Ghemawat, 2008).

    Hadoop is an open source usage of MapReduce, written in Java, at first created by Yahoo. Tan et al. (2009) expressed that Hadoop was worked because of the requirement for a MapReduce structure that was liberated by proprietal licenses, notwithstanding the expanding requirement for the innovation in Cloud processing. Hive, Pig, ZooKeeper and HBase are for the most part cases of frequently used augmentations to the Hadoop structure. Moreover, this investigation too focuses on Hadoop and analyzes the heap adjusting system in Hadoop’s MapReduce skeleton for little measured to medium-sized groups.

    In rundown, this investigation displays a system for expanding the work stack dissemination among hubs in the MapReduce structure, a system to diminish the essential memory impression and enhanced execution time for MapReduce when these procedures are performed on little or medium measured bunch of PCs. The rest of the piece of this examination is arranged as takes after. Segment 2 examines some fundamental data on MapReduce and its interior workings. Area 3 presents the related work and existing techniques connected for TeraSort in Hadoop. Area 4 contains a proposed thought for an enhanced load adjusting procedure and a way to all the more likely use memory. Area 5 presents investigational results and a talk

    of this present examination’s discoveries. Area 6 finishes up this investigation with a short thought to future work.


    Arranging is an essential idea and is required advance in innumerable calculations. Heinz et al. (2002) expressed that Burst Sort is an arranging calculation created for arranging strings in enormous information accumulations. The TeraSort calculation likewise uses these burst trie strategies as a strategy to sort information however does as such under the point of view of the Hadoop design and the MapReduce system. An fundamental issue for the MapReduce system is the thought of load adjusting. Over the period, a few examines have been done on the zone of load adjusting.

    Where information is arranged by (Hsu and Chen, 2012), how it is imparted by (Hsu and Chen, 2010), what foundation it is being situated on by (Hsu and Tsai, 2009; Hsu et al., 2008; Zaharia et al., 2008) and the measurable portion of the information would all be able to have a result on a frameworks effectiveness. The greater part of these calculations can be discovered all inclusive in an assortment of papers and have been used by structures and frameworks prior to the subsistence of the MapReduce structure expressed by (Krishnan, 2005; Stockinger et al., 2006). As expressed by (Candan et al., 2010), RanKloud make utilization of its individual uSplit technique for dividing gigantic media information sets. The uSplit technique is required to diminish information duplication costs and depleted assets that are specific to its media based calculations. In order to work pretty much saw limits of the MapReduce display, different expand or changes in the MapReduce models have been advertised. BigTable was propelled by Google to deal with organized information as revealed by (Chang et al., 2008). BigTable resembles a database, however, does not bolster an entire social database demonstrate. It uses columns with progressive keys assembled into tables that shape the substance of designation and load adjusting. What’s more, encounters from the comparative load and memory adjusting inconveniences looked by shared nothing databases. HBase of Hadoop is the open source rendition of BigTable, which mirrors the comparable usefulness of BigTable. In view of its straightforwardness of utilization, the MapReduce demonstrate is really prevalent and has various executions as detailed by (Liu and Orban, 2011; Miceli et al., 2009). Thus, there has been a assorted variety of research on MapReduce in order to show signs of improvement execution of the structure or the execution of specific applications like diagram mining as said by (Jiang and Agrawal, 2011), information mining revealed by (Papadimitriou and Sun, 2008; Xu et al., 2009), hereditary calculations by (Jin et al., 2008; Verma t al., 2009), or content examination by (Vashishtha et al., 2010) that execute on the structure.

    Incidentally, scientists find the MapReduce structure to be excessively strict or unbending in its current usage. Fadika and Govindaraju (2011) expressed that DELMA is one of such a system which mirrors the MapReduce show,

    indistinguishable to Hadoop MapReduce. Such a framework is probably going to have alluring burden adjusting issues, which is a far distance the extent of our paper. One more unique system to MapReduce is Jumbo as announced by (Groot and Kitsuregawa, 2010). The Kind sized structure might be a useful apparatus to examine stack adjusting, however it isn’t all around coordinated with existing MapReduce advances. To work around stack adjusting issues coming about because of joining tables in Hadoop, (Lynden et al., 2011) presented an versatile MapReduce calculation for a few joins utilizing Hadoop that works without changing its setting. This think about likewise endeavors to do workload adjusting in Hadoop without changing the first structure, yet focuses on arranging content.

    Kenn et al. (2013) expressed that the XTrie calculation displayed a strategy to propel the cut point calculation gotten from TeraSort. The critical issue of the TeraSort calculation is that to manage the cut focuses it uses the Quick Sort calculation. By utilizing quicksort, TeraSort needs to store all the keys it tests in memory and that abatements the likely example measure, which diminishes the accuracy of the favored cut focuses and this influences stack adjusting specified by (O’Malley, 2008). One more trouble TeraSort has is that it just thinks the initial 2 characters of a string amid parceling. This likewise diminishes the productivity of the TeraSort stack adjusting calculation:

    The primary issue determined by TeraSort and XTrie is that they use a cluster to speak to the trie. The major worry with this strategy is that it tends to hold a great deal of depleted space. Kenn et al. (2013) likewise expressed that an Calculation, the ReMap calculation, which diminishes the memory prerequisites of the first trie by diminishing the quantity of components it accepts. The ReMap diagram maps every single one of the 256 characters on an ASCII diagram to the decreased arrangement of components foreseen by the ETrie. Since the reason of ETrie is to copy words found in English content ReMap moves the ASCII characters to the 64 components. By dropping the quantity of components to think from 256 to 64 components for every level, the aggregate memory essential is lessened to 1/sixteenth of its unique impression for a 2-level Trie. In order to utilize the ETrie, the TrieCode offered in Equation 2 must be tweaked. The EtrieCode appearing in Equation 3 is indistinguishable to the TrieCode in Equation 2, however has been changed to reproduce the littler memory impression. Regardless of whether it is better than XTrie, the trouble with this strategy is that it has a tendency to have a considerable measure of depleted space. The EtrieCode condition is as per the following:

    The Proposed Method

    This segment portrays the key dividing as an option of hash code dividing utilizing Horner’s Rule which will be fused in TeraSort of Hadoop. Moreover, this segment talks about how memory can be spared by methods for a ReMap procedure. In agreement with investigational result of XTrie and ETrie, the unpredictable rate is lower, bring down being enhanced, while a trie has more levels. This is since the more profound a trie is the longer the prefix each key symbolizes. Along these lines, in this investigation, full length key is considered as prefix rather than 2 or 3 what’s more, the hash esteem likewise computed for the full key.

    Figure 2 represents how the hash code functions for a normal partitioner. In this delineation, there are 3 reducers furthermore, 3 strings. Each string originates from a key in a (key, esteem) combine. The primary string ‘ate’ comprises of 3 characters ‘a’, ‘t’ and ‘e’ and have the comparable ASCII esteems. The particular ASCII esteems are then provided to Equation 4 to acquire the hash esteem 137186. Due to 3 reducers, a modulo 3 is utilized which gives an esteem 2. At that point the esteem is expanded by one in the delineation since there is no reducer 0, which changes the incentive to 3. This moved the key-esteem combine to reducer 3. Utilizing the comparable system, the 2 different strings ‘terrible’ and ‘can’ are designated to reducers 2 and 1, correspondingly.


    To assess the execution of the proposed strategy, this investigation looks at how fine the calculations apportion the workload and takes a gander at how fine the memory is utilized. Tests performed in this investigation were finished utilizing LastFm Dataset, with each record containing the client profile with fields like nation, sexual orientation, age and date. Utilizing these records as our information, we reproduced PC systems utilizing VMware for Hadoop document framework. The tests are completed with a scope of size of dataset, for example, 1 Lakh, 3 Lakhs, 5 Lakhs, 10 Lakhs, 50 Lakhs and 1 Crore records.

    Amid the primary test, an info record containing 1 lakh records is considered. As said in the MapReduce Framework, the information set is partitioned into different parts and sent to Map Phase. Here for this information document, just a single mapper is considered since the number of mappers is relies upon the measure of the

    information document. In the wake of mapping, parcel calculation is utilized to

    zessen the quantity of yield records by gathering records in view of Htrie esteem on the nation characteristic which is accepted as a key here. Subsequent to gathering, 4 allotments are made utilizing the methodology GenderGroup-by-Country.

    All the comparing log records what’s more, counters are examined to see the execution. In the other 5 tests, input records with 3 Lakhs, 5 Lakhs, 10 Lakhs, 50 Lakhs and 1 Crore records are considered. According to the above said technique, all the input records are divided into 4 allotments. Keeping in mind the end goal to think about the distinctive philosophies introduced in this examination and decide how adjusted the workload conveyances are, this examination utilizes different measurements, for example, Effective CPU, Rate and Skew among different measurements like clock time, CPU, Bytes, Memory, Compelling CPU, Rate and Skew since just the said 3 parameters demonstrates the huge contrast in results. Rate shows the quantity of bytes from the Bytes segment separated by the quantity of seconds slipped by since the past report, adjusted to the closest kilobyte. No number shows up for values less than one KB for every second. Powerful CPU shows the CPU-seconds devoured by the activity between reports, isolated by the quantity of seconds slipped by since the past report. The outcome is communicated in units of CPU-seconds every second-a measure of how process or serious the activity is from each answer to the following. The skew of an information or stream parcel is the sum by which its size strays from the normal parcel estimate:


    The Tables 1-3 demonstrates the outcomes when utilizing different measured information documents for the correlation of the execution of ETrie, XTrie and HTrie with the parameters Skew, Effective CPU and Rate separately. Correspondingly, the Fig. 3-5 indicates correlation graph of the consequences of the above. From the tables and figures for results, it is demonstrated that the proposed strategy (HTrie) is

    performing superior to anything XTrie and ETrie in view of all the 3 parameters said above.


      This investigation introduced HTrie, far reaching apportioning system, to enhance stack adjusting for dispersed applications. By methods for enhancing load adjusting, MapReduce projects can end up being more capable at overseeing undertakings by lessening the by and large calculation time spent preparing information on every hub. The TeraSort was produced in view of subjectively created input information on a to a great degree enormous group of 910 hubs. In that particular processing setting and for that information arrangement, each segment made by MapReduce ended up obvious on just one or 2 hubs. Yet, conversely, our work assembles at little measured to medium-sized groups. This ponder changes their model and lifts it for a littler condition. An arrangement of

      experimentations have uncovered that given a skewed information test, the HTrie design was competent to defend more memory, was able to disseminate all the more processing assets by and large and do as such with a lesser measure of time multifaceted nature.


      After this, extra research can be made to present new apportioning instruments with the goal that it can be consolidated with Hadoop for applications utilizing diverse info tests since Hadoop record framework isn’t having any apportioning system aside from key dividing.

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