The clients contacts to the name node for locating information within the file system and provides information which is newly added, modified and removed from data nodes[8]. Research into the kinds of tolerances needed for critical systems involves a large amount of interdisciplinary work. Secondaries apply operations from the primary asynchronously. In Section 4 and 5, we show how these techniques are used in existing sys-tems, both general-purpose and special high-availability systems. The primary may, under some conditions, step down and become a secondary. When a single node causes whole system to crash and fails such node are known as single point failure nodes. 1.MEMORY MANAGEMENT 9 In order to protect operating systems components, fault tolerance begins with memory protection. The use of DSA(Dynamic Storage Allocation) leads to uncertainty in RTOS. After deciding the priorities, the enterprise has to work on the mock test. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Fault tolerance refers to the ability of a system (computer, network, cloud cluster, etc.) Here we can add an extra instance to a replica set as an arbiter. Fault-tolerance techniques make the hardware work proper and give correct result even some fault occurs in the hardware part of the system. Therefore, different fault tolerance techniques (FTTs) are critical for improving the efficient utilization of expensive resources in high performance grid computing systems, and an important component of grid workflow management system. Fault-Tolerance Techniques for High-Performance Computing - Ebook written by Thomas Herault, Yves Robert. HDFS provides high throughput access to application data and is suitable for applications that have large data sets [10]. There are mainly two main methods which are used to produce fault tolerance in Hadoop namely Data duplication and Checkpoint & recovery. First two techniques are common and are basically an adaptation of hardware fault-tolerance techniques. There are basically two techniques used for hardware fault-tolerance: Software Fault-tolerance Techniques: With the immense growth of internet and its users, Cloud computing, with its incredible possibilities in ease, Quality of service and on-interest administrations, has turned into a guaranteeing figuring stage for both business and non-business Each Hadoop cluster contains variety of nodes as shown in figure 5, hence HDFS architecture is broadly divided into following three nodeswhich are. HDFS is highly fault-tolerant and is designed to be deployed on low-cost hardware. This is overcome usingfault tolerance techniques.Fault tolerance is a system's ability to perform its function continuously even though any unexpected hardware or software failures occur. It is centrally placed node, which contains information about Hadoop file system [5]. Writing code in comment? 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