Real Time Hadoop Interview Questions from Various interviews Hive – Where do you use Internal or Managed table? What scenarios? In your resume, what do you mean by, “monitoring & managing MapReduce jobs"? Explain? Interviewer’s Project: How to modify the RDBMs’ Nested SQL queries into Hadoop framework using Pig. Sqoop: Need to know very well. Some of the current projects are importing data from other RDBMs sources into HDFS. Can […]
Hadoop Certification Dump Questions 1. From given below which describes how a client reads a file from HDFS? ( 1 ) The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly from the DataNode. The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond […]
1. What does commodity Hardware in Hadoop world mean? ( D ) a) Very cheap hardware b) Industry standard hardware c) Discarded hardware d) Low specifications Industry grade hardware 2. Which of the following are NOT big data problem(s)? ( D) a) Parsing 5 MB XML file every 5 minutes b) Processing IPL tweet sentiments c) Processing online bank transactions d) both (a) and (c) 3. What does “Velocity" in […]
Below are some of the hadoop interview questions and answers. 1. As the data is replicated thrice in HDFS, does it mean that any calculation done on one node will also be replicated on the other two? Since there are 3 nodes, when we send the MapReduce programs, calculations will be done only on the original data. The master node will know which node exactly has that particular data. In […]
Below are a few more hadoop interview questions and answers for freshers and experienced hadoop developers. Hadoop Interview questions and answers 1. What is the default block size in HDFS ? As of Hadoop-2.4.0 release, the default block size in HDFS is 256 MB and prior to that it was 128 MB. 2. What is the benefit of large block size in HDFS ? Main benefit of large block size […]
Below are a few more hadoop interview questions and answers for both freshers and experienced hadoop developers and administrators. Hadoop Interview questions and answers 1. What is a Backup Node? It is an extended checkpoint node that performs checkpointing and also supports online streaming of file system edits. It maintains an in memory, up-to-date copy of file system namespace and accepts a real time online stream of file system edits […]
Below are a few more Hadoop Interview Questions and Answers. Please refer previous posts on this topic for additional questions on HDFS. Hadoop Interview Questions and Answers 1. What is HDFS ? HDFS is a distributed file system implemented on Hadoop’s framework. It is a block-structured distributed file system designed to store vast amount of data on low cost commodity hardware and ensuring high speed process on data. HDFS stores […]
Below are a few hadoop interview questions for both hadoop developers and administrators. Hadoop Interview Questions and Answers 1. What is Big Data ? Big data is vast amount of data (generally in GBs or TBs of size) that exceeds the regular processing capacity of the traditional computing servers and requires special parallel processing mechanism. This data is too big and its rate of increase gets accelerated. This data can be either […]