Using HBase for Real-time Access to your Big Data Cognitive Class Exam Answers

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Get an overview of HBase, how to use the HBase API and Clients, its integration with Hadoop.

HBase is the open source Hadoop database used for random, real-time read/writes to your Big Data.

• Learn how to set it up as a source or sink for MapReduce jobs, and details about its architecture and administration, including labs for practice and hands-on learning.
• Learn how HBase runs on a distributed architecture on top of commodity hardware, including practice and hands-on learning of the following features:
  • Linear and modular scalability
  • Strictly consistent read and writes
  • Automatic and configurable sharding of tables
  • Automatic failover support between RegionServers
  • Easy to use Java API for client access

COURSE SYLLABUS

• Module 1 – Introduction to HBase
  1. HBase Overview, CAP Theorem and ACID properties
  2. Roles of HBase and difference between RDBMS
  3. HBase Shell and Tables
• Module 2 – HBase Client API – The Basics
  1. Use of Java API for Batch, Scan, and Scan operations
• Module 3 – Client API: Administrative and Advance Features
  1. Use of administrative operations and schemas
  2. Use of Filters, Counters, and ImportTSV tool
• Module 4 – Available HBase Clients
  1. Understand how interactive and batch clients interact with HBase
• Module 5 – HBase and MapReduce Integration
  1. Understand how MapReduce works in the Hadoop framework
  2. How to setup HBase as a source and a sink
• Module 6 – HBase Configuration and Administration
  1. Configuration of HBase for various environmental optimization
  2. Architecture and administrative tasks

Using HBase for Real-time Access to your Big Data Cognitive Class Exam Quiz Answers

Module 1: Introduction to HBase

Question 1: What are some of the key properties of HBase? Select all that apply.

• All HBase data is stored as bytes
• HBase can run up to 1000 queries per second at the most
• HBase is ACID compliant across all rows and tables
• HBase is a NoSQL technology
• HBase is an open source Apache project

Question 2: Which HBase component is responsible for storing the rows of a table?

• HDFS
• Region
• API
• ZooKeeper
• Master

Question 3: What is NOT a characteristic of an HBase table?

• Columns are grouped into column families
• Columns can have multiple timestamps
• Each row must have a unique row key
• NULL columns aren’t supported
• Columns can be added on the fly

Module 2: HBase Client API – The Basics 

Question 1: Which HBase command is used to update existing data in a table?

• Put
• Scan
• Get
• Batch
• Delete

Question 2: The batch command allows the user to determine the order of execution. True or false?

• True
• False

Question 3: Which of the following statements are true of the scan operation? Select all that apply.

• Scanner caching is enabled by default
• The startRow and endRow parameters are both inclusive
• The addColumn() method can be used to restrict a scan
• Scanning is a resource-intensive operation
• Scan operations are used to iterate over HBase tables

Module 3: Client API: Administrative and Advance Features

Question 1: Which statement about HBase tables is incorrect?

• HColumnDescriptor is used to describe columns, not column families
• A table requires two descriptor classes
• Performance may suffer if a table has more than three column families
• Everything in HBase is stored within tables
• Each table must contain at least one column family

Question 2: When using a CompareFilter, you must specify what to include as part of the scan, rather than what to exclude. True or false?

• True
• False

Question 3: What is an example of a Dedicated Filter? Select all that apply.

• SingleColumnValueFilter
• QualifierFilter
• ColumnPrefixFilter
• TimestampsFilter
• FamilyFilter

Module 4: Available HBase Clients

Question 1: Which statements accurately describe the HBase interactive clients? Select all that apply.

• Thrift is included with Hbase
• Thrift and Avro both support C++
• With REST, data transport is always performed in binary
• Avro has a dynamic schema
• REST needs to be complied before it can run

Question 2: Unlike an interactive client, a batch client is used to run a large set of operations in the background. True or false?

• True
• False

Question 3: Which of the following is an example of a batch client?

• PyHBase
• HBql
• Pig
• JRuby
• AsyncHBase

Module 5: HBase and MapReduce Integration

Question 1: HBase can act both as a source and a sink of a MapReduce job.

• False
• True

Question 2: Which HBase class is responsible for splitting the source data?

• TableReducer
• TableOutputFormat
• TableMapReduceUtil
• TableMapper
• TableInputFormat

Question 3: Which of the following is NOT a component of the MapReduce framework?

• Reducer
• OutputFormat
• Mapper
• InputFormat
• All of the above are part of the MapReduce framework

Module 6: HBase Configuration and Administration

Question 1: Which of the following statements accurately describe the HBase run modes? Select all that apply.

• The standalone mode is suited for a production environment
• The pseudo-distributed mode is used for performance evaluation
• The standalone mode uses local file systems
• The distributed mode is suited for a production environment
• The distributed mode requires the HDFS

Question 2: Which is NOT a component of a region server?

• StoreFile
• MemStore
• HFile
• ZooKeeper
• HLog

Question 3: What is an example of an operational task? Select all that apply.

• BulkImport
• CopyTable
• Adding Servers
• Node decommissioning
• Import and export

Using HBase for Real-time Access to your Big Data Final Exam – Cognitive Class

Question 1: Which statements accurately describe column families in HBase? Select all that apply.

• You aren’t required to specify any column families when declaring a table
• Each region contains multiple column families
• You typically want no more than two or three column families per table
• Column families have their own compression methods
• Column families can be defined dynamically after table creation

Question 2: Which of the following is NOT a component of HBase?

• Master
• Region
• ZooKeeper
• Pig
• Region Server

Question 3: Which programming language is supported by Thrift?

• PHP
• C#
• Python
• Perl
• All of the above

Question 4: Which HBase command is used to retrieve data from a table?

• Delete
• Get
• Scan
• Batch
• Put

Question 5: The HBase Shell and the native Java API are the only available tools for interacting with HBase. True or false?

• True
• False

Question 6: Without this filter, a scan will need to check every file to see if a piece of data exists.

• WhileMatchFilter
• TimeStampsFilter
• PageFilter
• SkipFilter
• BloomFilter

Question 7: What are the characteristics of the Avro client? Select all that apply.

• Avro is included with HBase
• Data transport is performed in binary
• Avro needs to be compiled before running
• Avro is a batch client
• Avro supports Python and PHP, among others

Question 8: Deleting an internal table in Hive automatically deletes the corresponding HBase table. True or false?

• True
• False

Question 9: What is the main purpose of an HBase Counter?

• To count the number of regions
• To increment column values for statistical data collection
• To count the number of region servers
• To count the number of column families
• All of the above

Question 10: Which file is used to specify configurations for HBase, HDFS, and ZooKeeper?

• RegionServer
• hbase-site.xml
• log4j.properties
• hbase-default.xml
• hbase-env.sh

Question 11: Which HBase component manages the race to add a backup master?

• Primary master
• Region
• ZooKeeper
• HDFS
• Region Server

Question 12: Which component of a region server is the actual storage file of the data?

• HFile
• Store
• StoreFile
• HLog
• HRegion

Question 13: When the master node is updated, which file can be used to automatically update the other nodes in the cluster?

• syncconf.sh
• synchbase.sh
• hbase-default.xml
• hbase-site.xml
• hbase-env.sh

Question 14: There is a single HLog for each region server. True or false?

• True
• False

Question 15: What is the main purpose of the Write-Ahead log?

• To store HBase configuration details
• To store HDFS configuration details
• To flush data when the system reaches its capacity
• To prevent data loss in the event of a system crash
• To store performance details