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YARN (Yet Another Resource Navigator) was introduced in the second version of Hadoop and this is a technology to manage clusters. However, at the time of launch, Apache Software Foundation described it as a redesigned resource manager, but now it is known as a large-scale distributed operating system, which is used for Big data applications.
YARN provided new capabilities to Apache Hadoop by decoupling resource management and scheduling capabilities. Now, with the help of YARN, interactive queries can be run on Hadoop and data streaming can also be done at the same time. This article describes YARN in detail and it includes YARN architecture, its features, and other functionalities.
YARN is a pre-requisite for Hadoop and provides security, data governance tools, resource management functionality across Hadoop clusters. YARN also extends the power of Hadoop by including new cost-effective processing, and linear-scale storage of beneficial technologies. A consistent framework is provided to developers and ISVs to write data, access applications which can run in Hadoop. Through following listed features YARN enhances the Hadoop capabilities:
YARN can split the job responsibilities of Job or Task Tracker into separate entities which are listed below:
Here among above-listed components resource manager works as the master node of YARN and is responsible to take resource inventory and can run Scheduler like important and critical services. Resource managers can allocate required resources to the running applications.
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As it does not track and monitor the application status so it is a pure scheduler. So,the resource manager is basically used to manage clusters of distributed applications of Hadoop YARN.
Resource Manager works with an Application manager and node managers present on every node in the following way:
Here in this architecture of Resource manager again has four components with the help of which it executes its responsibilities perfectly. These components are:
Resource management is a great feature which is present in YARN and it was launched to fulfill following tasks:
By far it has been clear that YARN is responsible to run and schedule the applications so that they can complete their task in a particular time frame. Here it is obvious that any application runs or executes in following steps:
Read: HDFS Tutorial Guide for Beginner
In the following diagram, a brief introduction of application execution is shown: Above shown steps are listed below for application execution:
The complete process of Application Startup can also be represented in the following manner: As per above diagram, there are three below listed actors of YARN:
The complete process can be summarized as:
A single application is responsible for the execution of Application Master. It asks for containers from resource scheduler and executes specific programs on the containers. So, we can say that Resource Manager is the core component of YARN and it occupies the role of Job tracker of MR version1. It is the central controlling authority for managing resources and allocating them to the proper and appropriate application. Through two main components named: Scheduler and ApplicationManager and it allocates resources to the applications.
Following services are used for the interaction of Resource Manager and other components:
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YARN has provided an exclusive feature to Hadoop system. In Hadoop version1, it was not able to manage the resources properly, and the user often finds it difficult to allocate resources properly. Through YARN now the scheduling and allocating the resource has become easier and the complete processing speed has been enhanced.
Through its various components, it can dynamically allocate various resources and schedule the application processing. For large volume data processing, it is quite necessary to manage the available resources properly so that every application can leverage them.
HDFS separation from Map Reduce has made the Hadoop environment more efficient and quicker. To know more about YARN and its capabilities you should join Hadoop training and certification program at JanBask right away.
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