CCB-400 Online Practice Questions and Answers

The cells in a given row have versions that range from 1000 to 2000. You execute a delete specifying the value 3000 for the version. What is the outcome?

A. The delete fails with an error.

B. Only cells equal to the Specified version are deleted.

C. The entire row is deleted.

D. Nothing in the row is deleted.

Under default settings, which feature of HBase ensures that data won't be lost in the event of a RegionServer failure?

A. AllHBase activity is written to the WAL, which is stored in HDFS

B. All operations are logged on theHMaster.

C. HBase is ACID compliant, which guarantees that itis Durable.

D. Data is stored on the local filesystem of the RegionServer.

Given that the following is your entire dataset:

100 column=Managers:Name, timestamp=13313141762084, value=Steve 100 column=Manage:Salary, timestamp=13313141762086, value=80000 100 column=Skills:Skill_1, timestamp=13313141762089, value=Hadoop 100 column=Skills:Skill_2, timestamp=13313141762092, value=HBase

How many regions will be read during a scan of the entire dataset?

A. Four

B. Two

C. One

D. Three

Yon are storing page view data for a large number of Web sites, each of which has many subdomains (www.example.com, archive.example.com, beta.example.com, etc.) Your reporting tool needs to retrieve the total number of page views for a given subdomain of a Web site. Which of the following rowkeys should you use?

A. The reverse domain name (e.g., com.example.beta)

B. The domain name followed by the URL

C. The URL

D. The URL followed by the reverse domain name

Given the following HBase dataset, which is labeled with row numbers. . .

Row # ROW KEY COLUMN+CELL 1 BB002 Column=Comments:C_Author, timestamp=001, value=Diana Mears 2 BB002 Column=Comments:C_Title, timestamp=001, value=Thanks 3 BB001 Column=INFO:Title, timestamp=005, value=HBsase+Hadoop 4 BB001 Column=INFO:Author,timestamp=005,value=Lars George 5 BB002 Column=Comments:C_Text, timestamp=001, value=Any tips on ... 6 BB001 Column=INFO:Text, timestamp=005, value=Some of the ...

Which of the following lists of row numbers is the correct order that HBase would store this data?

A. 1, 5, 2, 4, 3, 6

B. 4, 1, 2, 6, 3, 5

C. 4, 6, 3, 1, 5, 2

D. 3, 4, 6, 1, 2, 5

From within an HBase application, you would like to create a new table named weblogs. You have started with the following Java code:

HBaseAdmin admin = new HBaseAdmin (conf);

HTableDescriptor t = new HTableDescriptor("weblogs");

Which of the following method(s) would you use next?

A. admin.createTable(t);admin.enable.Table(t);

B. admin.createTable(t);

C. HTable.createTable(t);HTable.enableTable(t);

D. HTable.createTable(t);

Your client application connects to HBase for the first time and queries the .META. table. What information does the .META. table provide to your client application?

A. The location of a Region

B. The location ofan MMaster

C. The location of aZooKeeper

D. The location of a璕OOT璽able

You have a table where keys range from "A" to "Z", and you want to scan from "D" to "H." Which of the following is true?

A. A MultiGet must be issued for rows D, E, F, G, H.

B. The scan class supports ranges via the stop and start rows.

C. All scans are full table scans, the client must implement filtering.

D. In order to range scan, raw scan mode must be enabled.

Your client connects to HBase for the first time to road a row user_1234 located in a table Users. What process does your client use to find the correct RegionServer to which it should send the request?

A. The client looks up the location of ROOT,in which it looks up the location of META, in whichit looks up the location of the correct Users region.

B. The client looks up the location of the master, in which it looks up the location of META,in which it looks up thelocation of the correct Users region.

C. The client looks up the location of ROOT in which it looks up the location of the correctUsersregion.

D. The client queries the master to find the location of the Users table.

Your client application needs to write a row to a region that has, recently split. Where will the row be written?

A. One of the daughter regions

B. The original region

C. The .META. table

D. The HMaster

You have two tables in an existing RDBMS. One table contains order information (item, quantity, price, etc.) and the other contains store information (address, phone, manager, etc). These two tables are not often accessed simultaneously. You would like to move this data into HBase. How would you design the schema?

A. Create two tables each with a single columnfamily

B. Create a single table with one column family

C. Create a single table with two column families

D. Create two tables each with multiple column families

Which of the following configuration values determines automated splitting?

A. hbase.hregion.majorcompaction

B. hbase.hregion.flush.size

C. hbase.balancer.period

D. hbase.hregion.max.filesize

From within an HBase application, you want to retrieve two versions of a row, if they exist. Where your application should configure the maximum number of versions to be retrieved?

A. HTableDescriptor

B. HTable

C. Get or scan

D. HColumnDescriptor

You have a key-value pair size of l00 bytes. You increase your HFile block size from its default 64k. What results from this change?

A. scan throughput increases and random-access latency decreases

B. scan throughput decreases and random-access latencyincreases

C. scan throughput decreases and random-access latencydecreases

D. scan throughput increases and random-access latency increases

You have tin linage table live in production. The table users as the rowkey. You want to change the existing rowkeys to . Which of the following should you do?

A. Modify the client application to write to both the old table and a new table while migrating the old data separately

B. Use theALTERtable command to modify the rowkeys

C. Use theASSIGNcommand to modify the rowkeys

D. Add a new columnto store the userid