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2021 Oct CCB-400 real exam

Q11. 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

Answer: D


Q12. You have an average key-value pair size of 100 bytes. Your primary access is random needs on the table. Which of the following actions will speed up random reading performance on your cluster?

A. Turn off WAL on puts

B. Increase the number of versions kept

C. Decrease the block size

D. Increase the block size

Answer: D


Q13. You have two tables in existing RDBMS. One contains information about the products you sell (name, size, color, etc.) The other contains images of the products in JPEG format. These tables are frequently joined in queries to your database. You would like to move this data into HBase.

How would you design the schema?

A. Create two tables each with multiple column families

B. Create two tables each with a single column family

C. Createasingle table with two column families

D. Create a single table with one column family

Answer: B


Q14. 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

Answer: A


Q15. Your client is writing to a region when the RegionServer crashes. At what point in the write is your data secure?

A. From the moment the RegionServer wrote to the WAL (write-ahead log)

B. From the moment the RegionServer returned the call

C. From the moment the RegionServer received the call

D. From the moment the RegionServer wrote to the MemStore

Answer: A


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Q16. 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

Answer: C


Q17. Given that the following is your entire dataset:

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

A. Four

B. Two

C. One

D. Three

Answer: A


Q18. 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.

Answer: A


Q19. Given the following HBase table schema:

Row Key, colFam_A:a, colFam_A:b, colFamB:2, colFam_B:10

A table scan will return the column data in which of the following sorted orders:

A. Row Key, colFam_A:a, colFam__A:b, colFam_B:10, colFam_B:2

B. Row Key, colFam_A:a, colFam__A:b,colFam_B:2, colFam_B:10

C. Row Key, colFam_A:a, colFam__B:2, colFam_A:b, colFam_B:10

D. Row Key, colFam_A:a, colFam__B:10, colFam_A:b, colFam_B:2

Answer: B


Q20. You have 40 Web servers producing timeseries data from Web traffic logs. You want to attain high write throughput for storing this data in an HBase table. Which of these should you choose for a row key to maximize your write throughput?

A. <hashCode(centralServerGeneratedSequenceID) ><timestamp>

B. <Long.MAX_VALUE – timestamp>

C. <timestamp>

D. <hashCode(serverGeneratingTheWeblog)><timestamp>

Answer: C