HBase architecture (RegionServer, HMaster) in Hadoop - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Role of RegionServer in HBase

What is the primary responsibility of a RegionServer in HBase architecture?

A Coordinating cluster-wide metadata and assigning regions to RegionServers

B Managing client requests and serving regions containing subsets of tables

C Storing the HBase master configuration files

D Handling data replication between HDFS nodes

💡 Hint

Think about which component directly handles data storage and client queries.

RegionServers handle client read/write requests by managing regions, which are subsets of tables. They serve data directly to clients.

🧠 Conceptual

intermediate

Function of HMaster in HBase

Which of the following best describes the role of the HMaster in HBase?

A It replicates data across multiple RegionServers

B It stores all user data and handles read/write requests

C It manages cluster metadata, assigns regions to RegionServers, and monitors RegionServers

D It manages HDFS storage blocks

💡 Hint

Consider which component is responsible for coordination and management tasks.

The HMaster manages metadata, assigns regions to RegionServers, and monitors their health but does not serve data directly.

❓ data_output

advanced

Output of RegionServer Status Command

Given the following HBase shell command output snippet showing RegionServer status, what is the number of regions served by the RegionServer 'rs1.example.com'?

Hadoop

rs1.example.com,60020,3,100,200,50

A 3

B 60020

C 100

D 50

💡 Hint

The second value is the port, the third is the number of regions.

In the status output, the third value represents the number of regions served by the RegionServer.

🧠 Conceptual

advanced

Effect of HMaster Failure

What happens in an HBase cluster if the active HMaster fails?

A All RegionServers stop serving data until HMaster is restored

B The cluster automatically shuts down

C Data is lost because HMaster stores all data

D RegionServers continue serving data, and a backup HMaster takes over the management duties

💡 Hint

Think about fault tolerance and high availability in HBase.

HBase supports multiple HMasters but only one active. If the active fails, a backup takes over without interrupting RegionServers.

🧠 Conceptual

expert

Region Assignment Process in HBase

Which component is responsible for assigning regions to RegionServers and how does it handle region splits?

A HMaster assigns regions to RegionServers and updates metadata after region splits occur

B RegionServer assigns regions to itself and handles splits locally without notifying HMaster

C HDFS assigns regions to RegionServers and manages splits automatically

D Clients assign regions to RegionServers and manage splits through API calls

💡 Hint

Consider which component manages metadata and region distribution.

The HMaster manages region assignments and updates metadata after region splits to keep cluster state consistent.