HBase DATA-SCIENCE-OPTIMIZE Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   In HBase's data model, what is the role of a column qualifier?

   • AIt specifies the data type of the value stored in the cell.
   • BIt identifies a specific column within a column family.
   • CIt provides a unique identifier for each row in the table.
   • DIt defines the column family that a column belongs to.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   Which component allows Hive to query data stored in HBase?

   • AHBase Thrift Gateway
   • BHive-HBase Storage Handler
   • CHBase REST API
   • DHive Metastore
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4. 8foundation · easy

   How does HBase differ from a traditional relational database?

   • AHBase stores data in a single node, while relational databases are distributed.
   • BHBase is column-oriented and schema-flexible, while relational databases are row-oriented with a fixed schema.
   • CHBase provides strong ACID transactions across multiple rows, while relational databases do not.
   • DHBase supports SQL queries and complex joins, while relational databases do not.
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5. 9expert · hard

   A team is designing an HBase table for a time-series application that stores sensor readings. The workload is write-heavy, and the team needs to avoid hot-spotting on a single RegionServer. They also need to query readings for a specific sensor over a time range. Which row key design best balances write distribution and query efficiency?

   • ARow key = salted sensor ID + timestamp
   • BRow key = sensor ID + timestamp
   • CRow key = random UUID
   • DRow key = timestamp + sensor ID
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6. 10application · medium

   A company stores clickstream data in HBase and needs to run a nightly batch job to compute aggregate statistics. The job will read large portions of the table and write results to HDFS. Which approach is most efficient for this workload?

   • AUse a series of HBase shell 'scan' commands and process the output in a script
   • BExport the entire table to CSV using HBase's export utility, then run a standalone Java program
   • CUse Hive to create an external table on HBase and run a Hive query
   • DUse a MapReduce job with an HBase TableInputFormat
   Reveal Solution Discussion Select an answer first