(D), 33. Which of the following Batch Processing instance is NOT an example of ( D), a) Processing 10 GB sales data every 6 hours, d) Trending topic analysis of tweets for last 15 minutes, 6. Drop the Hive staging table. c) Bank fraud transactions detection. Which of the following is the outer most part of HBase data model ( A ), 82. Following are the syntaxe used for external tables: To create the table, we use the following command: Dropping an external table from the current database Which of the following is the highest level of Data Model in Hive? (C), 70. ( B ), 14. Snowflake supports integrating Apache Hive metastores with Snowflake using external tables. Which of the following are the core components of Hadoop? There are many DDL commands. The partitioned columns in Hive tables are (B), a) Physically present and can be accessed, c) Physically present but can’t be accessed, d) Physically absent and can’t be accessed. In Hive terminology, external tables are tables not managed with Hive. Here are the steps that the you need to take to load data from Azure blobs to Hive tables stored in ORC format. (B), 96. Hive can be used for real time queries. (D), 86. ( B), NameNodes are usually high storage machines in the clusters. Distributed cache files can’t be accessed in Reducer. The external table data is stored externally, while Hive metastore only contains the metadata schema. It doesn't delete the external data. The data files permission and ownership are preserved so that the relevant external processes can continue to write in it even after failover. Delete temporary objects at end of mapping. a) OLTP Transactions. You cannot directly load data from blob storage into Hive tables that is stored in the ORC format. ( D), c) True only for Apache and Cloudera Hadoop, 13. (D), a) Combiners can be used for mapper only job, b) Combiners can be used for any Map Reduce operation, c) Mappers can be used as a combiner class, d) Combiners are primarily aimed to improve Map Reduce performance, e) Combiners can’t be applied for associative operations, c) In either phase, but not on both sides simultaneously, 36. To execute this command you must be the owner of the external table. Which of the following are true for Hadoop Pseudo Distributed Mode? The partitioned columns in Hive tables are (B) a) Physically present and can be accessed B. Which of the following tables in HBase holds the region to key mapping? suppose I have dropped an external table(EMP) the table was stored at /user/hive/satya/. Partitioned tables can’t load the data from normal (partitioned) tables (B) a) True. Which of the following writable can be used to know the value from a mapper/reducer? External tables are defined as tables that do not reside in the database, and can be in any format for which an access driver is provided. In Hive,” user/hive/warehouse” is the default directory. The client then reads the data directly off the DataNode. The NameNode returns the block location(s) to the client. Assuming default settings, which best describes the order of data provided to a reducer’s reduce method. Consequently, dropping of an external table does not affect the data. C. Neither keys nor values are in any predictable order. Which of the following is not true about Name Node? Managing External Tables. The following table descriptions the options for LKM SQL to Hive SQOOP. On dropping external tables, Hive: (A), 98. ( D), a) Complex Event Processing (CEP) platforms. Also, for external tables, data is not deleted on dropping the table. Unlike external tables, dropping an internal table also deletes the underlying data. 2. Managed tables don’t allow loading data from other tables. Create an external table STORED AS TEXTFILE and load data from blob storage to the table. 102. Indentify the utility that allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer? (c), 75. What is the optimal size of a file for distributed cache? (C), 59. This can be addressed by explicitly marking the table "EXTERNAL". B. Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order. 1. Internal tables are stored in this directory by default. A. What is the data type of row key in HBase? When you drop a table from Hive Metastore, it removes the table/column data and their metadata. Dropping external table in Hive does not drop the HDFS file that it is referring whereas dropping managed tables drop all its associated HDFS files. Create a CSV file of data you want to query in Hive. Internal table are like normal database table where data can be stored and queried on. c) Drops both, data and metadata . D. The client contacts the NameNode for the block location(s). ( D), b) Speed of individual machine processors, 4. Sliding window operations typically fall in the category (C ) of__________________. ( C), 16. Which of the following are not possible in Hive? External Tables. The EXTERNAL keyword lets you create a table and provide a LOCATION so that Hive does not use a default location for this table. An external table means the data is managed separately from the metadata associated with it. HBase is a key/value store. Both the keys and values passed to a reducer always appear in sorted order. HDFS Federation is useful for the cluster size of: (C), 93. The client reads the data directory off the DataNode(s). (B), 49. D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order, Your email address will not be published. This comes in handy if you already have data generated. 99. Which of the following Hadoop config files is used to define the heap size? Identify the batch processing scenarios from following: (C) & (E), d) Fraudulent Transaction Identification Job, 67. A. (E), 69. Senior Hadoop developer with 4 years of experience in designing and architecture solutions for the Big Data domain and has been involved with several complex engagements. We will use External table when We want to retain the data even after dropping the table but where as it is not so in the case with HIVE Managed table, We also use Hive, When the data need to be shared with other tools in the Hadoop Eco system such as Pig,Spark and so on and so forth. What is the default HDFS replication factor? ( D ), 15. Which of the following APIs can be used for exploring HBase tables? (E), 40. Which of the following are NOT true for Hadoop? Hive should not own data and control settings, dirs, etc., you have another program or process that will do those things. 1 MB input file), d) Processing User clicks on a website e) All of the above, 64. a) Complex Event Processing (CEP) platforms. (E), Runs on multiple machines without any daemons, Which of following statement(s) are correct? Which of the following is the correct representation to access ‘’Skill” from the (A) Bag {‘Skills’,55, (‘Skill’, ‘Speed’), {2, (‘San’, ‘Mateo’)}}, 51. Because that's what a managed table is, as compared to an external one. Which of the following is NOT the component of Flume? Hive manages all the security for managed tables. (C), b) Runs on multiple machines without any daemons, c) Runs on Single Machine with all daemons, d) Runs on Single Machine without all daemons, 72. Categorize the following to the following datatype, b) Word Docs , PDF Files , Text files – Unstructured, d) Data from enterprise systems (DB, CRM) – Structured, 63. ( C), 17. What decides number of Mappers for a MapReduce job? c) True, if source and destination are in the same cluster, d) False, if source and destination are in the same cluster, 28. Sliding window operations typically fall in the category (C ) of__________________. An e… The external data sources or files are not deleted. If the tables is an internal/managed table then the data along with metadata is removed permanently. 97. 23. Now we learn few things about these two 1. B. (D), 41. D. Keys are presented to a reducer in random order; values for a given key are sorted in ascending order. When you drop an Internal table, it drops the table from Metastore, metadata and it’s data files from the data warehouse HDFS location. UDFs can be applied only in FOREACH statements in Pig. As we know the metadata will be deleted if we will drop the external table and actual data will be there. You want to use a custom location such as ASV. A Map reduce job can be written in: (D), d) Any Language which can read from input stream, d) Creating multiple datasets from a single large dataset, 48. (E), 62. 97. Hive supports replication of external tables with data to target cluster and it retains all the properties of external tables. DUMP Statement writes the output in a file. The High availability of Namenode is achieved in HDFS2.x using (C), 91. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce? External tables should be used when you expect the underlying data to be updated by an external source, such as an automated data upload process, or by another MapReduce operation, and you always want Hive queries to use the latest data. If you want the DROP TABLE command to also remove the actual data in the external table, as DROP TABLE does on a managed table, you need to configure the table properties accordingly. The partitioned columns in Hive tables are (B) a) Physically present and can be accessed (B), 56. What does commodity Hardware in Hadoop world mean? Technical strengths include Hadoop, YARN, Mapreduce, Hive, Sqoop, Flume, Pig, HBase, Phoenix, Oozie, Falcon, Kafka, Storm, Spark, MySQL and Java. On dropping external tables, Hive: (A) a) Retains data, but deletes metadata . (B), 50. Hive has a Internal and External tables. 31.Which of the following can be used to control the number of part files ( B) in a map reduce program output directory? How ever, when you drop the table, hive would attempt to delete the externally located data. Now you could happily use both Hive HQL queries as well as hand-crafted map-reduce programs on the same data. (C), 43. (B), 45. (D ), c) NameNode keeps the image of the file system also, 18. Drop the partitions -- when you drop the partitions, data pertained to the partitions will also be dropped as now this table is managed table . The Hive connector detects metastore events and transmits them to Snowflake to keep the external tables synchronized with the Hive metastore. 32. In most cases, the user will set up the folder location within HDFS and copy the data file(s) there. Parameters could be passed to Pig scripts from: (E), 54. (D), b) It supports structured and unstructured data analysis, c) It aims for vertical scaling out/in scenarios, 11. ( A ), 21. (B), 88. It is necessary to default all the properties in Hadoop config files. As soon as at least one mapper has finished processing its input split. Which of the following is NOT a type of metadata in NameNode? d) Retains both, data and metadata . Engineering 2021 , Engineering Interview Questions.com, HADOOP Objective type Questions with Answers. For an external table, If you are trying to drop a partition and as-well would like to delete the data. The NameNode then queries the DataNodes for block locations. (B), 30. Hive UDFs can only be written in Java ( B ), 80. Maximum size allowed for small dataset in replicated join is: (C), 53. This allows users to manage their data in Hive while querying it from Snowflake. 98. Your email address will not be published. distcp command ALWAYS needs fully qualified hdfs paths. As soon as a mapper has emitted at least one record. 98. This location is included as part of the table definition statement. From the options listed below, select the suitable data sources for the flume. B. If you do though it violates invariants and expectations of Hive and you might see undefined behavior. Partitioned tables can’t load the data from normal (partitioned) tables (B), 99. It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in … That doesn’t mean much more than when you drop the table, both the schema/definition AND the data are dropped. Which of the following operations can’t use Reducer as combiner also? Which of the following is the correct sequence of MapReduce flow? The application master monitors all Map Reduce applications in the cluster (B), 92. The article describes the Hive Data Definition Language(DDL) commands for performing various operations like creating a table/database in Hive, dropping a table/database in Hive, altering a table/database in Hive, etc. Name Node monitors block replication process ( B), 71. c) Drops both, data and metadata. There are 2 types of tables in Hive, Internal and External. This article will cover each DDL command individually, along with their syntax and examples. Which describes how a client reads a file from HDFS? We can customize when the reducers startup by changing the default value of. Replicated joins are useful for dealing with data skew. HDFS data blocks can be read in parallel. Table A-1 LKM SQL to Hive SQOOP. We do not have to provide the location manually while creating the table. The DataNode that contains the requested data responds directly to the client. Creating Internal Table . Examples A. when you drop the table the table’s dataset or files will also be deleted from HDFS (B) & (D), 66. If the table is external table then only the metadata is dropped. ( C), Are Managed by Hive for their data and metadata. Data needs to remain in the underlying location even after a DROP TABLE. Home » HADOOP MCQs » 300+ TOP HADOOP Objective Questions and Answers, 1. (A), 97. 106. There are two types of tables in Hive ,one is Managed table and second is external table. Read the statement and select the correct option: ( B). When you run DROP TABLE on an external table, by default Hive drops only the metadata (schema). In the hive, there are two types of tables: Internal Table or Managed Table; External Table or Unmanaged Table; Managed Table/Internal Table. While deletion only table schema gets deleted. Parameters. 105. Using basic syntax DROP EXTERNAL TABLE SalesPerson; DROP EXTERNAL TABLE dbo.SalesPerson; DROP EXTERNAL TABLE EasternDivision.dbo.SalesPerson; B. Hadoop is a framework that allows the distributed processing of: (C), 65. ( D ), d) Low specifications Industry grade hardware, 2. b) Stock market data analysis. Counters persist the data on the hard disk. The data still lives in a normal file system and nothing is stopping you from changing it without telling Hive about it. ( B), 26. This document lists some of the differences between the two but the fundamental difference is that Hive assumes that it ownsthe data for managed tables. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. c) … On dropping managed tables, Hive: (C), 95. When you drop a Hive table all the metadata information related to the table is dropped. Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. An external table describes the metadata / schema on external files. C. Keys are presented to a reducer in random order; values for a given key are not sorted. What does “Velocity” in Big Data mean? This case study describes creation of internal table, loading data in it, creating views, indexes and dropping table on weather data. Execute SQOOP to extract the source data and import into Hive. Oracle Database allows you read-only access to data in external tables. The client queries the NameNode for the block location(s). b) False. So my Question is that how we can restore the external table(EMP) how we will get the data. The data files are not affected. C. The client contacts the NameNode for the block location(s). Specify a value for the key hive.metastore.warehouse.dir in the Hive config file hive-site.xml. Data can be loaded in HBase from Pig using ( D ), 85. Dropping an External table drops just the table from Metastore and the actual data in HDFS will not be removed. When is the earliest point at which the reduce method of a given Reducer can be called? Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client. This can apply if you are pointing multiple schemas (tables or views) at a single data set or if you are iterating through various possible schemas. Which of following is the return data type of Filter UDF? “Drop table” command deletes the data permanently. Which of the following are NOT metadata items? The managed tables are converted to external tables after replication. ( C), a) Master and slaves files are optional in Hadoop 2.x, b) Master file has list of all name nodes, c) Core-site has hdfs and MapReduce related common properties, d) hdfs-site file is now deprecated in Hadoop 2.x, 73. ( C), 19. Hive assumes that it has no ownership of the data for external tables, and thus, it does not require to manage the data as in managed or internal tables. Read the statement and select the correct options: ( A). The schema of a relation can be examined through: (B), 55. Which of following statement(s) are true about distcp command? a) Tool for Random and Fast Read/Write operations in Hadoop, b) Faster Read only query engine in Hadoop, 10. Only one distributed cache file can be used in a Map Reduce job. b) Retains metadata, but deletes data. Which of the following is/are true? ( D), 27. (A & D), a) HBase table has fixed number of Column families, b) HBase table has fixed number of Columns, 83. What should be an upper limit for counters of a Map Reduce job? ( D), 22. D. It depends on the InputFormat used for the job. The mechanism used to create replica in HDFS is____________. Types of Drop Table in Hive. Which of the following are example(s) of Real Time Big Data Processing? ( C), c) True if the client machine is the part of the cluster, d) True if the client machine is not the part of the cluster, 20. (A), 60. d) Retains both, data and metadata. When dropping an EXTERNAL table, data in the table is DROP EXTERNAL [WEB] TABLE [IF EXISTS] [CASCADE | RESTRICT] Description. 101. This chapter describes how to drop a table in Hive. (C ), 24. What is the default HDFS block size? NameNode tries to keep the first copy of data nearest to the client machine. Try dropping the table, you will see that the raw data is retained. Difference between Hive Managed Table vs External Table Where is the HDFS replication factor controlled? (B), 87. Another consequence is tha… External tables can load the data from warehouse Hive directory. Which of the following type of joins can be performed in Reduce side join operation? The client reads the data directly off the DataNode. (A), b) It invokes MapReduce if source and destination are in the same cluster, c) It can’t copy data from the local folder to hdfs folder, d) You can’t overwrite the files through distcp command, 29. Hive queries response time is in order of (C), b) Can load the data only from local file system, d) Are Managed by Hive for their data and metadata, a) Are aimed to increase the performance of the queries, c) Are not useful if the filter columns for query are different from the partition columns, 78. Which interface should your class implement? The NameNode contacts the DataNode that holds the requested data block. 7. Which of the following is/are correct? On dropping external tables, Hive: (A) a) Retains data, but deletes metadata. Which of the following is not a valid Hadoop config file? Partitioned tables can’t load the data from normal (partitioned) tables (B) a) True . Your email address will not be published. Working and Creating External tables in Hive By default, in Hive table directory is created under the database directory. ( C), Master and slaves files are optional in Hadoop 2.x, Which of the following is true for Hive? would anyone give me the steps need to perform to get the data? For instructions, see Integrating Apache Hive Metastores with Snowflake. Which interface should your class implement? This is a direct load LKM and will ignore any of the target IKM. Table Creation by default It is Managed table . (E), b) Processing 30 minutes Flight sensor data, c) Interconnecting 50K data points (approx. That means that the data, its properties and data layout will and can only be changed via Hive command. Which of the following are the Big Data Solutions Candidates? External tables are used for external use means when the table data resides outside Hive then these tables are used. ( C), 74. Which of the following is/are true about combiners? b) Big Data Batch Processing. Again, when you drop an internal table, Hive will delete both the schema/table definition, and it will also physically delete the data/rows(truncation) associated with that table from the Hadoop Distributed File System (HDFS). the difference is , when you drop a table, if it is managed table hive deletes both data and meta data, if it is external table Hive only deletes metadata. ( D), 3. When You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. (B)& (C) &(D), a) It is the Master Machine of the Cluster, b) It is Name Node that can store user data, d) Name Node can be replaced by any Data Node Machine, 68. Which of the following class is responsible for converting inputs to key-value (c) Pairs of Map Reduce, 42. d) both (a) and (c) 7. Which of the following are NOT metadata items? When an external table is deleted, Hive will only delete the schema associated with the table. (B), 52. Which describes how a client reads a file from HDFS? The client queries all DataNodes in parallel. A managed table means the table data is managed by hive. Hive managed tables stores the data in (C), 94. Alter external table as internal table -- by changing the TBL properties as external =false . (B), 44. Hadoop Interview Questions for experienced and freshers, HBase Interview Questions for experienced and freshers, Pig Interview Questions for experienced and freshers. What is the data type of version in HBase? Pig can be used for real-time data updates. Dropping an external table removes all table-related metadata. Option Description; DELETE_TEMPORARY_OBJECTS. C. Not until all mappers have finished processing all records. Data can be supplied to PigUnit tests from: (C), 57. (B), 37. External table files can be accessed and managed by processes outside of Hive. When You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. Which of the following is true for Hive? The keys given to a reducer aren’t in a predictable order, but the values associated with those keys always are. (D), 90. b) Retains metadata, but deletes data . Pig jobs have the same run time as the native Map Reduce jobs. These tables are used generally when you want to delete metadata from the table and keep the table data as it is. Which of following statement(s) are correct? A. Specifically it is: ( E ), 81. This can be achieved as below. A. Keys are presented to reducer in sorted order; values for a given key are not sorted. An external table is one where only the table schema is controlled by Hive. Number of mappers is decided by the (D), 39. A. Combiner , A. Reducer , A. Combiner , A. Combiner . In the previous examples the data is stored in /page_view. (D), 58. ( C ). (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. Where does Sqoop ingest data from? The term Big Data first originated from: ( C ), 5. The DataNodes respond to the NameNode, and the NameNode redirects the client to the DataNode that holds the requested data block(s). (C), 38. Required fields are marked *. 104. Which of the following constructs are valid Pig Control Structures? When is the earliest point at which the reduce method of a given Reducer can be called? . DROP EXTERNAL TABLE drops an existing external table definition from the database system. Their purpose is to facilitate importing of data from an external file into the metastore. 3. b) False . The main difference between an internal table and an external table is simply this: An internal table is also called a managed table, meaning it’s “managed” by Hive. 99. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. 103. Which of the following are NOT big data problem(s)?
Canteen Contract Agreement Format, Accident Route 1 North Massachusetts, Pyathena Create Table, Baby Boy Names Starting With Ti, Sierra Vista Noise Ordinance, Justin Ripley Physics, Company Looking For Canteen Concessionaire 2021, Second Hand Outdoor Playground Equipment,