Top 70 Hazelcast Multiple Choice Questions (MCQs) with Answers

1 .

What is Hazelcast?

A)

A file system

B)

In-memory data grid

C)

An operating system

D)

A database management system

Correct Answer : In-memory data grid

Explanation : Hazelcast is an open-source, distributed, in-memory data grid designed for high availability and scalability.

2 .

What programming languages are supported by Hazelcast?

A)

Java and C#

B)

PHP and Perl

C)

SQL and Power BI

D)

Python and Ruby

Correct Answer : Java and C#

Explanation : Hazelcast is primarily written in Java and provides client libraries for C#.

3 .

Is Hazelcast open-source?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Yes, Hazelcast is open-source.

4 .

Which of the following is true about Hazelcast?

A)

Hazelcast is a centralized cache.

B)

Hazelcast is a distributed cache.

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Hazelcast is a distributed cache.

Explanation : Hazelcast is a distributed cache.

5 .

What is the primary benefit of using Hazelcast for distributed caching?

A)

Increased security

B)

Enhanced data visualization

C)

Reduced network traffic

D)

Improved database performance

Correct Answer : Reduced network traffic

Explanation : Hazelcast’s distributed caching reduces network traffic by keeping frequently accessed data in memory, reducing the need to access the database.

6 .

Which of the following data structures is not supported by Hazelcast?

A)

Set

B)

Map

C)

Queue

D)

Tree

Correct Answer : Tree

Explanation : Hazelcast supports Map, Queue, and Set data structures, but not Tree.

7 .

Hazelcast can be only run in a single node?

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

Explanation : Hazelcast can be operated in isolation (as a single node) or in cluster mode (as numerous nodes).

8 .

Which of the following configuration does Hazelcast supports?

A)

XML-based Configuration

B)

Programmatic Configuration

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

Explanation : Hazelcast offers both programmatic and XML-based configurations.

9 .

Hazelcast by default uses JDK-based logging because ____?

A)

To improve caching

B)

To improve security

C)

To avoid dependencies

D)

All of the above

Correct Answer : To avoid dependencies

Explanation : To eliminate dependencies, Hazelcast employs JDK-based logging by default.

10 .

What is OSGI?

A)

Object service gateway initiated

B)

Open service gateway initiative

C)

Object source gateway initialized

D)

None of the above

Correct Answer : Open service gateway initiative

Explanation : OSGI stands for open-service gateway initiative.

11 .

Which of the following is the default serialization in Hazelcast?

A)

Java Serialization

B)

Custom Serializers

C)

Hazelcast JSON Serialization

D)

Hazelcast Portable Serialization

Correct Answer : Java Serialization

Explanation : Java Serialization is the default serialization in Hazelcast.

12 .

Partial start means that the cluster starts with an incomplete member set.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

Explanation : True, Partial start means that the cluster starts with an incomplete member set.

13 .

A Hazelcast client that connects to a single member of a Hazelcast cluster is known as a ____ client.

A)

Clear client

B)

Smart client

C)

Unisocket client

D)

None of the above

Correct Answer : Unisocket client

Explanation : A Hazelcast client that connects to a single member of a Hazelcast cluster is known as a unisocket client.

14 .

A ____ is a Hazelcast client that connects to a Hazelcast cluster using a known set of cluster members' addresses.

A)

Clear client

B)

Smart client

C)

Unisocket client

D)

None of the above

Correct Answer : Smart client

Explanation : A smart client is a Hazelcast client that connects to a Hazelcast cluster using a known set of cluster members' addresses.

15 .

What is the maximum cluster size supported by Hazelcast?

A)

50 nodes

B)

100 nodes

C)

200 nodes

D)

Unlimited

Correct Answer : Unlimited

Explanation : Hazelcast can support an unlimited number of nodes in a cluster, depending on the resources available.

16 .

In Hazelcast, which of the following data types is a distributed data structure that may hold many values for a single key?

A)

List

B)

RingBuffer

C)

MultiMap

D)

ReplicatedMap

Correct Answer : MultiMap

Explaination : In Hazelcast, Multimap data types are a distributed data structure that may hold many values for a single key.

17 .

In terms of partitioning methods, Hazelcast has how many different sorts of distributed objects?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : In terms of partitioning strategies, Hazelcast has two sorts of distributed objects:

* Partitioned Data structure
* Non-partitioned Data structure

18 .

What are partitioned data structures?

A)

Partitioned data structures are those in which a single partition stores the whole instance.

B)

Partitioned data structures are data structures in which each partition holds a portion of the instance.

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Partitioned data structures are data structures in which each partition holds a portion of the instance.

Explanation : Partitioned data structures are data structures in which each partition holds a portion of the instance.

19 .

Map, Multimap, and Cache come under which type of data structures?

A)

Partitioned Data structures

B)

Non-partitioned Data structures

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Partitioned Data structures

Explanation : The following are the partitioned Hazelcast data structures :

* Map
* MultiMap
* Cache (Hazelcast JCache implementation)
* Event Journal

20 .

"____" implies that the cluster will be started even if not all members are present or accessible.

A)

Full start

B)

Partial start

C)

Force start

D)

All of the above

Correct Answer : Force start

Explanation : "Force start" implies that the cluster will be started even if not all members are present or accessible.

21 .

What is the role of the Hazelcast cluster manager?

A)

To provide security for the cluster

B)

To manage the data in the cache

C)

To distribute the data across the cluster

D)

To manage the nodes in the cluster

Correct Answer : To manage the nodes in the cluster

Explanation : The Hazelcast cluster manager is responsible for managing the nodes in the cluster, including adding and removing nodes as needed.

22 .

What is the default eviction policy in Hazelcast?

A)

Random

B)

LRU (Least Recently Used)

C)

FIFO (First In First Out)

D)

LFU (Least Frequently Used)

Correct Answer : LRU (Least Recently Used)

Explanation : Hazelcast’s default eviction policy is LRU, which removes the least recently used items from the cache when it reaches its maximum size.

23 .

What is the difference between Hazelcast's IMap and ICache interfaces?

A)

There is no difference between the two interfaces.

B)

IMap is a key-value store, while ICache is a data structure.

C)

ICache provides more advanced caching features than IMap.

D)

IMap provides a distributed cache, while ICache provides a distributed map.

Correct Answer : IMap is a key-value store, while ICache is a data structure.

Explanation : IMap is a distributed key-value store, while ICache is a distributed data structure that provides caching functionality.

24 .

What is the difference between Hazelcast's IExecutorService and IMap interfaces?

A)

IExecutorService and IMap are the same interface with different names.

B)

IExecutorService provides a distributed key-value store, while IMap is a distributed thread pool.

C)

IExecutorService provides a distributed thread pool, while IMap is a distributed key-value store.

D)

None of the above.

Correct Answer : IExecutorService provides a distributed thread pool, while IMap is a distributed key-value store.

Explanation : IExecutorService provides a distributed thread pool, allowing the execution of tasks across a Hazelcast cluster, while IMap provides a distributed key-value store.

25 .

What are non-partitioned data structures?

A)

Non-Partitioned data structures are those in which a single partition stores the whole instance.

B)

Non-Partitioned data structures are data structures in which each partition holds a portion of the instance.

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Non-Partitioned data structures are those in which a single partition stores the whole instance.

Explanation : Non-partitioned data structures are those in which a single partition stores the whole instance.

26 .

Queue, set, list comes under which type of data structures?

A)

Partitioned Data structures

B)

Non-partitioned Data structures

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Non-partitioned Data structures

Explanation : The following are the Non-partitioned Hazelcast data structures :

* Queue
* Set
* List
* Ringbuffer
* FencedLock
* ISemaphore
* IAtomicLong
* IAtomicReference
* FlakeIdGenerator
* ICountdownLatch
* Cardinality Estimator
* PN Counter

27 .

You can use which of the following method to destroy a Hazelcast distributed object?

A)

End

B)

Finish

C)

Delete

D)

Destroy

Correct Answer : Destroy

Explanation : You can use the destroy method to destroy a Hazelcast distributed object.

28 .

Which of the following is the default allocation strategy?

A)

Round-robin allocation strategy

B)

NUMA-aware allocation strategy

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Round-robin allocation strategy

Explanation : The round-robin allocation strategy is the default allocation strategy in Hazelcast.

29 .

Hazelcast support how many types of allocation strategies?

A)

1

B)

2

C)

3

D)

4

Correct Answer : 2

Explanation : Hazelcast supports two allocation strategies:

* Round-robin allocation strategy
* NUMA-aware allocation strategy

30 .

Hazelcast JCache provide which of the following eviction policy?

A)

LRU

B)

LFU

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

Explanation : Hazelcast JCache has two well-known eviction policies: LRU and LFU.

31 .

Which of the following is a feature of Hazelcast's distributed locking system?

A)

Deadlock detection

B)

Automatic lock expiration

C)

Support for both pessimistic and optimistic locking

D)

All of the above

Correct Answer : All of the above

Explanation : Hazelcast’s distributed locking system supports automatic lock expiration, both pessimistic and optimistic locking, and deadlock detection.

32 .

What is the role of Hazelcast's event system?

A)

To monitor the clusterâ€™s health

B)

To synchronize data across the cluster

C)

To allow nodes to communicate with each other

D)

To provide real-time notifications of data changes

Correct Answer : To provide real-time notifications of data changes

Explanation : The Hazelcast event system provides real-time notifications of data changes across the cluster, allowing applications to react immediately to changes.

33 .

What is the role of Hazelcast's WAN replication?

A)

To synchronize data between clusters

B)

To provide high availability for the cluster

C)

To distribute data across the cluster

D)

To provide real-time notifications of data changes

Correct Answer : To synchronize data between clusters

Explanation : Hazelcast’s WAN replication allows data to be synchronized between geographically distributed clusters, providing improved availability and disaster recovery capabilities.

34 .

What is the purpose of Hazelcast's query system?

A)

To provide full-text search capabilities

B)

To allow SQL queries to be run on the data

C)

To provide filtering and aggregation capabilities

D)

All of the above

Correct Answer : All of the above

Explanation : Hazelcast’s query system allows SQL queries to be run on the data, provides full-text search capabilities, and supports filtering and aggregation.

35 .

What is the role of Hazelcast's serialization system?

A)

To optimize data transmission across the network

B)

To convert data to a format that can be stored in memory

C)

To convert data between different programming languages

D)

All of the above

Correct Answer : All of the above

Explanation : Hazelcast’s serialization system converts data to a format that can be stored in memory, converts data between different programming languages, and optimizes data transmission across the network.

36 .

To obtain the map, which method is employed?

A)

Get

B)

obtain

C)

getMap

D)

obtainMap

Correct Answer : getMap

Explanation : To obtain the map, use the getMap function.

37 .

By default, distributed maps have how many backups?

A)

Zero

B)

One

C)

Two

D)

Many

Correct Answer : One

Explanation : By default, distributed maps have one backup.

38 .

By default, backup operations are ______.

A)

Synchronous

B)

Asynchronous

C)

Can Not Say

D)

None of the above

Correct Answer : Synchronous

Explanation : By default, backup operations are synchronous.

39 .

Which of the following backup do not block operations?

A)

Synchronous

B)

Asynchronous

C)

Can Not Say

D)

None of the above

Correct Answer : Asynchronous

Explanation : Sync backup operations have a blocking penalty, which may result in latency concerns, whereas Asynchronous backup operations do not.

40 .

Do backups increase memory usage?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Backups increase memory use since they are also retained in memory.

41 .

A map can have which of the following backup?

A)

Sync

B)

Async

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Both (A) and (B)

Explanation : At the same time, a map can have both sync and async backups.

42 .

Hazelcast Jcache provides how many methods for cache configuration?

A)

5

B)

4

C)

3

D)

2

Correct Answer : 2

Explanation : Hazelcast JCache provides two different methods for cache configuration:

* declaratively: using hazelcast.xml/yaml or hazelcast-client.xml/yaml
* programmatically: the typical Hazelcast way, using the Config API

43 .

In which of the following transaction type the commit log is recorded locally, but it is transferred to another cluster member?

A)

One_phase

B)

Two_phase

C)

Three_phase

D)

None of the above

Correct Answer : Two_phase

Explaination : In the two_phase transaction type the commit log is recorded locally, but it is transferred to another cluster member.

44 .

If you want better performance which of the following transaction type you should use?

A)

One_phase

B)

Two_phase

C)

Can Not Say

D)

None of the above

Correct Answer : One_phase

Explanation : It is advised that you use ONE PHASE as the transaction type if you desire greater performance, and TWO PHASE if system dependability is more essential than performance.

45 .

How many types of Transactions are supported by Hazelcast?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : Hazelcast support two types of transactions: One_phase and Two_phase.

46 .

What is the role of Hazelcast's Replicated Map?

A)

To replicate data across the cluster

B)

To provide a global view of the data

C)

To provide a distributed key-value store

D)

To provide synchronization between nodes

Correct Answer : To provide a global view of the data

Explanation : Hazelcast’s Replicated Map provides a global view of the data stored across the cluster, allowing all nodes to access the same data regardless of where it is stored.

47 .

What is the role of Hazelcast's ICache interface?

A)

To provide a distributed thread pool

B)

To allow nodes to communicate with each other

C)

To provide a distributed key-value store with caching capabilities

D)

None of the above

Correct Answer : To provide a distributed key-value store with caching capabilities

Explanation : Hazelcast’s ICache interface provides a distributed key-value store with caching capabilities, allowing frequently accessed data to be stored in memory for improved performance.

48 .

What is the role of Hazelcast's Near Cache?

A)

To provide a global view of the data

B)

To synchronize data across the cluster

C)

To cache frequently accessed data locally

D)

None of the above

Correct Answer : To cache frequently accessed data locally

Explanation : Hazelcast’s Near Cache caches frequently accessed data locally, reducing the need for network traffic and improving performance.

49 .

Does the Hazelcast map has any restrictions on size?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : By default, Hazelcast maps have no size constraints and can grow indefinitely big.

50 .

____ restricts the maximum lifespan of an entry saved inside the map?

A)

Eviction

B)

Expiration

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Expiration

Explanation : Expiration restricts the maximum lifespan of an entry saved inside the map.

51 .

The default load balancing mechanism of Hazelcast clients is set to ______.

A)

IP hash

B)

Round Robin

C)

Weighted Round robin

D)

None of the above

Correct Answer : Round Robin

Explanation : The default load balancing mechanism is set to round-robin.

52 .

Does Hazelcast client are responsible to store data or have ownership to store data?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : No

Explanation : Hazelcast clients are only used to access data held by the cluster's Hazelcast members. They are not in charge of storing data and do not claim ownership of it.

53 .

Does Hazelcast support JMX monitoring?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Yes, Hazelcast supports JMX monitoring.

54 .

A RingBuffer is configured with a capacity of ____ items by default.

A)

1,00,000

B)

50,000

C)

10,000

D)

5,000

Correct Answer : 10,000

Explanation : A RingBuffer is configured with a capacity of 10,000 items by default.

55 .

You can insert an item in RingBuffer using which of the following method?

A)

Put

B)

Enter

C)

Insert

D)

Add

Correct Answer : Add

Explanation : You can insert an item in RingBuffer using the add method.

56 .

The ____ of the Hazelcast RingBuffer data structure is where objects are overwritten or expired.

A)

Tail

B)

Head

C)

Can Not Say

D)

None of the above

Correct Answer : Head

Explanation : The head of the Hazelcast RingBuffer data structure is where objects are overwritten or expired.

57 .

You can eliminate all map entries that match your condition, with the help of which of the following method?

A)

Delete ()

B)

Erase_all ()

C)

Delete_all ()

D)

RemoveAll()

Correct Answer : RemoveAll()

Explaination : You can eliminate all map entries that match your condition, with the help of the removeAll() method.

58 .

Which of the following method will get you the statistics of maps in your Hazelcast?

A)

getMapStats()

B)

getLocalMapStats()

C)

getLocalMapStats()

D)

None of the above

Correct Answer : getLocalMapStats()

Explanation : The getLocalMapStats() method will get you the statistics of maps in your Hazelcast.

59 .

You can add an item to one cluster member and delete it from another by using the _______.

A)

Queue

B)

RingBuffer

C)

MultiMap

D)

ReplicatedMap

Correct Answer : Queue

Explanation : You can add an item to one cluster member and delete it from another by using the Hazelcast distributed queue.

60 .

A ____ queue is a standard blocking queue that uses a comparator to arrange entries.

A)

Priority

B)

Bounded

C)

Restricted

D)

None of the above

Correct Answer : Priority

Explanation : A priority queue is a standard blocking queue that uses a comparator to arrange entries.

61 .

To add items to the Hazelcast list, which of the following methods is used?

A)

Add

B)

Put

C)

Insert

D)

All of the above

Correct Answer : Add

Explanation : To add items to the Hazelcast list, add methods is used.

62 .

What is the role of Hazelcast's Aggregator framework?

A)

To provide built-in aggregation functions

B)

To provide filtering and transformation capabilities

C)

To allow custom aggregation functions to be written

D)

None of the above

Correct Answer : To allow custom aggregation functions to be written

Explanation : Hazelcast’s Aggregator framework allows custom aggregation functions to be written, providing flexibility in how data is processed and analyzed.

63 .

Which of the following is a feature of Hazelcast's Management Center?

A)

Automatic failover

B)

Real-time monitoring of cluster health

C)

Data replication between clusters

D)

None of the above

Correct Answer : Real-time monitoring of cluster health

Explanation : Hazelcast's Management Center provides real-time monitoring of cluster health, making it easier to diagnose and fix issues as they arise.

64 .

What is the role of Hazelcast's ICountDownLatch interface?

A)

To provide a distributed thread pool

B)

To provide synchronization between nodes

C)

To allow nodes to communicate with each other

D)

None of the above

Correct Answer : To provide synchronization between nodes

Explanation : Hazelcast’s ICountDownLatch interface provides synchronization between nodes, allowing tasks to be coordinated and executed in a specific order.

65 .

What is the role of Hazelcast's Cluster Heartbeat?

A)

To provide a global view of the data

B)

To synchronize data across the cluster

C)

Both (A) and (B)

D)

To monitor the health of nodes in the cluster

Correct Answer : To monitor the health of nodes in the cluster

Explanation : Hazelcast’s Cluster Heartbeat monitors the health of nodes in the cluster, helping to ensure that the system remains available and responsive.

66 .

Which of the following is a benefit of using Hazelcast's distributed messaging system?

A)

Improved scalability

B)

Improved performance

C)

Improved fault tolerance

D)

All of the above

Correct Answer : All of the above

Explanation : Hazelcast’s distributed messaging system can improve performance by reducing the need for network traffic, improve scalability by allowing messages to be distributed across multiple nodes, and improve fault tolerance by providing redundancy and failover capabilities.

67 .

What is the role of Hazelcast's IAtomicLong interface?

A)

To provide synchronization between nodes

B)

To provide a distributed thread pool

C)

To allow nodes to communicate with each other

D)

None of the above

Correct Answer : To provide synchronization between nodes

Explanation : Hazelcast’s IAtomicLong interface provides synchronization between nodes, allowing multiple nodes to access and modify a shared long value in a thread-safe manner.

68 .

What is the role of Hazelcast's IExecutorService interface?

A)

To provide synchronization between nodes

B)

To allow nodes to communicate with each other

C)

To provide a distributed thread pool

D)

None of the above

Correct Answer : To provide a distributed thread pool

Explanation : Hazelcast’s IExecutorService interface provides a distributed thread pool, allowing tasks to be executed across multiple nodes in a coordinated manner.

69 .

What is the role of Hazelcast's ICondition interface?

A)

To provide a distributed thread pool

B)

To provide synchronization between nodes

C)

To allow nodes to communicate with each other

D)

None of the above

Correct Answer : To provide synchronization between nodes

Explanation : Hazelcast’s ICondition interface provides synchronization between nodes, allowing threads to wait for a specific condition to be met before proceeding.

70 .

What is the role of Hazelcast's ITopic interface?

A)

To provide a distributed thread pool

B)

To allow nodes to communicate with each other

C)

To provide synchronization between nodes

D)

None of the above

Correct Answer : To allow nodes to communicate with each other

Explanation : Hazelcast’s ITopic interface allows nodes to communicate with each other by publishing and subscribing to messages on a topic.

71 .

Which of the following is a benefit of using Hazelcast's distributed semaphore?

A)

Improved scalability

B)

Improved performance

C)

Improved fault tolerance

D)

All of the above

Correct Answer : All of the above

Explanation : Hazelcast’s distributed semaphore can improve performance by reducing the need for network traffic, improve scalability by allowing multiple nodes to access a resource concurrently, and improve fault tolerance by providing redundancy and failover capabilities.

72 .

A ____ queue is one that has a finite capacity.

A)

Bounded

B)

Priority

C)

Restricted

D)

None of the above

Correct Answer : Bounded

Explanation : A bounded queue is one that has a finite capacity.

73 .

Hazelcast saves queue entries in ____ form by default?

A)

Serialised

B)

De serialised

C)

Can Not Say

D)

None of the above

Correct Answer : Serialised

Explanation : Hazelcast saves queue entries in serialised form by default.

74 .

Which of the following is true about Hazelcast's distributed transactions?

A)

They are optimized for high throughput

B)

They can only be used with Hazelcastâ€™s IMap

C)

They are fully ACID-compliant

D)

None of the above

Correct Answer : They are fully ACID-compliant

Explanation : Hazelcast’s distributed transactions are fully ACID-compliant, meaning they provide Atomicity, Consistency, Isolation, and Durability guarantees.

75 .

Which of the following data structures in Hazelcast is used for distributed caching?

A)

ITopic

B)

IMap

C)

IQueue

D)

None of the above

Correct Answer : IMap

Explanation : IMap is a distributed key-value store in Hazelcast that can be used for distributed caching.