What Is MapReduce Architecture? An Important Overview For 2021

Ajay Ohri


MapReduce Architecture is a programming model and a software framework utilized for preparing enormous measures of data. MapReduce program works in two stages, to be specific, Map and Reduce. Map requests that arrange with mapping and splitting of data while Reduce tasks reduce and shuffle the data. 

Hadoop MapReduce Architecture is fit for running MapReduce programs written in different languages: C, Python, Ruby, and Java. The projects of MapReduce in cloud computing are equal, accordingly help to perform an enormous scope of data examination utilizing various machines in the cluster.

  1. MapReduce Architecture
  2. Components of MapReduce Architecture

1. MapReduce Architecture

HDFS and MapReduce architecture are the two significant parts of Hadoop that make it so efficient and powerful to utilize. MapReduce is a programming model utilized for proficient handling in equal over huge data collections in a conveyed way. The data is first to part and afterward consolidated to deliver the eventual outcome.

The MapReduce task is predominantly isolated into 2 phases:

  1. Map Phase
  2. Reduce Phase

The libraries for MapReduce are written in so many programming languages with different diverse various improvements. The motivation behind Map Reduce in Hadoop is to Map every one of the positions, and afterward, it will decrease it to comparable undertakings for giving less overhead over the cluster network and to diminish the preparing power.

2. Components of MapReduce Architecture

  • Components of MapReduce Architecture are:
  • Client
  • Job
  • Hadoop MapReduce Master
  • Job Parts
  • Input Data
  • Output Data
  1. Client: The MapReduce client is the person who carries the Job to the MapReduce for preparing. There can be numerous clients accessible that persistently send works for preparing to the Hadoop MapReduce Manager.
  2. Job: The MapReduce Job is the real work that the customer needed to do which is included such countless more modest errands that the customer needs to execute or process.
  3. Hadoop MapReduce Master: It separates the specific occupation into resulting position parts.
  4. Job Parts: The sub-jobs or tasks that are acquired in the wake of isolating the primary work. The aftereffect of all the work parts joined to deliver the last yield.
  5. Input Data: The data index that is taken care of to the MapReduce for handling.
  6. Output Data: The end-product is acquired after preparation.

In MapReduce Architecture, we have a client. The client will present the job of a specific size to the Hadoop MapReduce Master. Presently, the MapReduce expert will isolate this job into additional identical job parts. These job parts are then made accessible for the MapReduce Task.

Map Reduce programming according to the necessity of the utilization case that the specific organization is tackling. The engineer composes their rationale to satisfy the prerequisite that the business requires. The input which we are utilizing is then taken care of to the Map Task, and the Map will produce moderate key-esteem pair as its yield. The output of Map, for example, these key-esteem sets, are then taken care of to the Reducer, and the last yield is put away on the HDFS- Hadoop Distributed File System.

There can be n number of MapReduce assignments made accessible for preparing the information according to the prerequisite. The calculation for MapReduce is made in an exceptionally upgraded way to such an extent that the time intricacy or space intricacy is least.

How about we examine the MapReduce phases to improve comprehension of its architecture: 

MapReduce Architecture is fundamentally partitioned into two phases, for example, Map phase and Reduce phase.

  1. Map: As the name proposes, its principle use is to plan the input data in key-esteem sets. The contribution to the map might be a key-esteem pair where the key can be the id of some sort of address, and worth is the real value that it keeps. The Map () capacity will be executed in its memory vault on every one of these input key-esteem pairs and creates the moderate key-esteem pair, which fills in as a contribution for the Reducer or Reduce () work.
  2. Reduce: The middle of the key-esteem combines that fill in as contribution for Reducer are send and sort and shuffled off the Reduce () work. Reducer total or gathering the data-dependent on its key-esteem pair according to the reducer calculation composed by the developer.
  • How Task Tracker and the Job tracker manage MapReduce Architecture:
  1. Task Tracker: It can be considered as the real slaves that are dealing with the guidance given by the Job Tracker. This Task Tracker is conveyed on every one of the nodes accessible in the cluster that executes the MapReduce task as taught by Job Tracker.
  2. Job Tracker: It is to deal with all the jobs and all the resources across the cluster and to plan each guide on the Task Tracker running on a similar information hub since there can be many data nodes accessible in the cluster.

There is additionally one significant segment of MapReduce Architecture known as Job History Server. The Job History Server is a daemon cycle that recoveries and stores authentic data about the application or task, similar to the logs which are created after or during the work execution are put away on Job History Server.

Hadoop MapReduce architecture presently has become a famous solution for the present world necessities. The plan of Hadoop remembers different objectives. Hadoop MapReduce architecture diagram that encourages you to comprehend it better.

  • Hadoop MapReduce framework architecture includes three significant layers. They are:
  1. HDFS- Hadoop Distributed File System: NameNode and DataNode, Block in HDFS, and Replication Management.
  2. Yarn: Scheduler, and Application Manager.
  3. MapReduce: Map Task, and Reduce Task.


The MapReduce Architecture system works on the mind-boggling interaction of preparing monstrous information that is accessible in the Hadoop structure. There have been numerous critical changes in the MapReduce programming language. 

Hadoop is quite possibly the most well-known system to handle huge information, and extraordinary compared to other supporting squares of Hadoop is MapReduce. If you are looking for a profession as an information examiner in the data science field, at that point, you should know about this rising and well-known programming language.

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