This layering of architecture works fine for smaller setups while for larger organizations where a huge volume of data needs to be taken care at a rapid speed, e.g. Tags: Question 9 . The HDFSFileSink operator writes files in parallel to a Hadoop Distributed File System. The above command must be executed against all datanodes on the cluster. Archived files will display with the extension .arc. Let us check the limitations as explained below . ii) Hadoop High Availability feature supports only single Namenode within a Hadoop cluster. asked Jun 18, 2016 in Business by Fantastic_One. Which of the following statements regarding importing streaming data from InfoSphere Streams into Hadoop is TRUE? These commands are Linux based commands which control the Hadoop environment and data files. 3. c. Hadoop is open source. C. 0. The following steps are needed to add new namenodes , o$HADOOP_PREFIX_HOME/bin/hdfs dfadmin -refreshNameNode :, Summary: HDFS federation has been introduced to overcome the limitations of earlier HDFS implementation. Hadoop is an open-source framework that allows to store and process big data across a distributed environment with the simple programming models. New Namenode related to the config must be added in the configuration files. These datanodes send periodic reports and responds to the commands from the name nodes. Two @@ hold the raw data record across iterations of the DATA step. Big Data Quiz : This Big Data Expert Hadoop Quiz contains set of 60 Big Data Quiz which will help to clear any exam which is designed for Expert. Hadoop fs Commands are the command-line utility for working with the Hadoop system. 72. Build vs. Buy In-App Chat: Which Option Is Best for You? answered Dec 31, 2019 by SakshiSharma. 6. which of the following is a duty of the datanodes in hdfs? fs.defaultFS - the default path prefix used by the Hadoop FS client when none is given. 72. So it is important to understand the steps to add new name nodes and scale horizontally. Its power is in the library itself. Hadoop MCQs : This section focuses on "Basics" of Hadoop. 1. MapReduce processes the original files names even after files are archived. Two @@ are invalid syntax and will cause the program to fail to execute. A - Data Seek time is improving faster than data transfer rate. Since 2004 from its launch, Facebook is one of the biggest users of Hadoop Cluster. Which of following statement(s) are correct? 4. B. InfoSphere Streams can only write directly to BigInsights, not other Hadoop distributions like 71. Which of the following is true about the Hadoop federation? If these two are different, the additional namenode wont be the part of the federated cluster. 1. DataFlair has published a series of Hadoop Quizzes from basic to advanced. b) False. 2. d. Hadoop is highly scalable. SURVEY . Hadoop 2.0 improves horizontal scalability of the NameNode through HDFS Federation and eliminates the Single Point of Failure Problem with the NameNode High Availability; Hadoop NameNode High Availability problem: Hadoop 1.0 NameNode has single point of failure (SPOF) problem- which means that if the NameNode fails, then that Hadoop Cluster will become out-of-the-way. Uses JournalNodes to decide the active NameNode; Allows non-Hadoop programs to access data in HDFS; Allows multiple NameNodes with their own namespaces to share a pool of DataNodes; Implements a resource manager external to all Hadoop frameworks; 15. Zamir says: April 20, 2015 at 2:33 pm. It uses several namenodes or namespaces which are independent of each other. which component determines the specific nodes that a mapreduce task will run on? b) Big Data Batch Processing. Choose the correct option from below list ADS Posted In : BigData | Apache Pig: Which of the following is not a scalar data type? 0 votes . Adding scalability at the namespace layer is the most important feature of HDFS federation architecture. It allows new services to use block storage directly. 0. Email id: techalpineit@gmail.com, http://techalpine.com/what-is-hdfs-federation">. But HDFS federation is also backward compatible, so the single namenode configuration will also work without any changes. b) hadoop-site.xml. Thanks! C - The namenode allows new client request to keep trying to read it. Which of the following statements is true of democracy? Hadoop is capable of running MapReduce programs written in various languages: Java, Ruby, Python, and C++. Flume. The HDFSFileSink operator writes files in parallel to a Hadoop Distributed File System. Which of the following is not true about Pig? 0. D - Only the storage capacity is increasing without increase in data transfer rate. Each block pool is managed independently. 3 Comments on which of the following Hadoop computing daemons? d. Hadoop is highly scalable. a. Posted in BigData Tagged 3 phases of mapreduce, 6. which of the following is a duty of the datanodes in hdfs?, 7. which of the following is a duty of the namenode in hdfs?, 8. which component determines the specific nodes that a mapreduce task will run on?, An introduction to the Hadoop Distributed File System, and jaql, Apache Spark Journey - Hadoop Component to Big Data Platform, applications of mapreduce, Many small files will become fewer large files. C - Data Seek time and data transfer rate are both increasing proportionately. B - Data Seek time is improving more slowly than data transfer rate. c) hadoop-env.sh. HDFS Federation architecture also opens up the architecture for future innovations. Some of the commonly used Hadoop fs commands are listing the Which of the following is true about the Hadoop federation? 8. which component determines the specific nodes that a mapreduce task will run on? True False 14. c) Bank fraud transactions detection. Bob has a Hadoop cluster with 20 machines with the following Hadoop setup: replication factor 2, 128MB input split size. This framework has been widely used by developers, enterprises and startups and has proven to be a reliable software platform for processing up to petabytes of data on clusters of thousands of commodity B) Hadoop includes a query language called Big. The Streams Big Data toolkit operators that interface with HDFS uses Apache Flume to integrate with Hadoop C . True; False; 14. The Hadoop Distributed File System (HDFS) is the primary data storage system used by Hadoop applications. yahoo and Facebook it was found that this approach has some limitations which are handled by the Hadoop federation. Hadoop federation allows scaling the name service horizontally. i) Hadoop High Availability feature tackles the namenode failure problem only for the MapReduce component in the hadoop stack. C. JobTracker. A global variable is declared in the highest-level block in which it is used. Our requirement is user connected to one of the datacenters either DCE or DCW should be able to access his data which is existing in some other opposite datacenter. Which of the following are true for Hadoop Pseudo Distributed Mode? Democracy is not suitable for large countries with wide social diversities. Work Place: Nagarro Software Pvt Ltd. TechAlpine has been formed in the year 2008 by a group of Information Technology professionals from premier institutions and organizations with emphasis on the use of modern technologies on different technology platform. These commands are widely used to process the data and related files. The qualifying parameter for a data to become Big Data is/are Volume Variety Variability Velocity Capabilities that can be claimed for BigData Technology is/are Cost Effectiveness Scalabilily Good Processing Power Big Data is capable of doing parallel processing. View:-557 Question Posted on 19 Dec 2020 Which of the following is not a scalar data type? Optionally, you may now configure the default path for Hadoop clients to use the new HA-enabled logical URI. 4. Each datanode is registered with all the namenodes in the cluster. Which of the following is true of Hadoop? Each machine has 500GB of HDFS disk space. These Multiple Choice Questions (MCQ) should be practiced to improve the hadoop skills required for various interviews (campus interviews, walk-in interviews, company interviews), placements, entrance exams and other competitive examinations. Explain the benefit of Hadoop versus other nondistributed parallel framworks in terms of their hardware requirements. Your email address will not be published. Facebooks Hadoop Cluster. _____ are user requests for particular business intelligence results on a particular schedule or in response to particular events. These independent namenodes are federated i.e. Compatibility - The applications developed for Hadoop v1 run on YARN without any disruption or availability issues. b) Speed of individual Select one: a. Before you start, please bookmark all quizzes and finish them before appearing for the next interview: Hadoop Quiz 1; Hadoop Quiz 2; Hadoop Quiz 3; Hadoop Quiz 4 let and const are similiar to each other. 24. 1) We are having two datacenters named DCE and DCW in two distinct locations. HDFS federation is designed to overcome the limitations of the single node HDFS architecture where the storage can scale up horizontally not the namespace. And, many Software Industries are 2) Which of the following is true about Hadoop High Availability? 1) What is identity mapper in hadoop. 4. d) both (a) and (c) 7. B. With this, let us now move on to our next topic which is related to Facebooks Hadoop Cluster. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Archived files must be UN archived for HDFS and MapReduce to access the original, small files. A) Hadoop is written in C++ and runs on Linux. Hadoop MCQ Questions: We have listed here the Best Hadoop MCQ Questions for your basic knowledge of Hadoop. TechAlpine is a technology centric software Solution Company in India. (C) a) It runs on multiple machines. Which of the following tool is designed for efficiently transferring bulk data between Apache Hadoop and structured datastores such as relational databases. We have a block pool which is a set of blocks that belong to a single namespace. It is called as the Beefiest Hadoop cluster. D) Technical skills are not required to run and use Hadoop. Figure 1: An HDFS federation architecture. Which of the following is true? TRUE FALSE Which of the following is not a feature of HDFS ? When the config fs.azure.io.read.tolerate.concurrent.append is made true, the If-Match header sent to the server for read calls will be set as * otherwise the same will be set with ETag. Which of the following is not a valid Hadoop config file? which of the following is not an open source project related to hadoop? c) B) Hadoop includes a query language called Big. 4. MapReduce processes the original files names even after files are archived. Which of the following says Hadoop provides does Pig break? Correct option is . const keyword declares a block scoped variable. Your email address will not be published. The programs of Map Reduce in cloud computing are parallel in nature, thus are very useful for performing large-scale data analysis using multiple machines in Explain the benefit of Hadoop versus other nondistributed parallel framworks in terms of their hardware requirements. Subscriptions _____ requires users to request business intelligence results. HDFS employs a NameNode and DataNode architecture to implement a distributed file system that provides high-performance access to data across highly scalable Hadoop clusters. Sliding window operations typically fall in the category (C ) of__________________. mapreduce algorithms for big data analysis, mapreduce can take which type of format as input, mapreduce tasktracker daemon is responsible for, Microsoft Completes Journey To Big Data Through Hadoop, number of namenode present in serving state. TRUE FALSE Which of the following is not a feature of HDFS ? 0. False. which of these provides a stream processing system used in hadoop ecosystem? Apache Sqoop. Dear Readers, Welcome to Hadoop Objective Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Hadoop Multiple choice Questions.These Objective type Hadoop are very important for campus placement test and job interviews. One namespace and its block are collectively called Namespace Volume. Problem: Which of the following statements is true about global variables? When same mapper runs on D. Democracy does not provide scope for dissent. IV. It is designed to store and retrieve data in a manner that does not rigidly enforce the atomicity, consistency, isolation, and durability (ACID) conditions associated with the relational database model.b. which of the following is a duty of the datanodes in hdfs? MapReduce is the processing unit of Hadoop here in this website you will get all questions on mapreduce with synatx and frequent faq c) Runs on Single Machine with all daemons. Posted on July 14, 2017 August 10, 2017 by sanjeeva. B. Overview: We are well aware of the features of Hadoop and HDFS. Start the new namenode and the secondary namenode, Refresh the other datanodes to pick the newly added namenode by running the following command .
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