Single point of failure identification in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the component that can cause a system outage if it fails.

HLD

if system.has_single_[1]():
    alert('Single point of failure detected')

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Anode

Bredundancy

Cbackup

Dreplica

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing redundancy with the failing component.

The term 'node' refers to a single component in the system. If there is only one node performing a critical task, it is a single point of failure.

2fill in blank

medium

Complete the code to check if the database is a single point of failure.

HLD

if database.[1] == 1:
    print('Warning: Single point of failure in database')

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Aqueries

Breplicas

Cusers

Dconnections

Attempts:

3 left

💡 Hint

Common Mistakes

Checking connections or users instead of replicas.

If the database has only one replica, it means no backup exists, making it a single point of failure.

3fill in blank

hard

Fix the error in the code that identifies a single point of failure in the load balancer.

HLD

if load_balancer.status == '[1]':
    raise Exception('Single point of failure detected')

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Afailed

Binactive

Credundant

Dactive

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'inactive' or 'active' which do not indicate failure.

The load balancer failing ('failed' status) indicates a single point of failure if no backup exists.

4fill in blank

hard

Fill both blanks to detect single points of failure in a system with multiple components.

HLD

for component in system.components:
    if component.is_[1]() and not component.has_[2]():
        print(f'Single point of failure: {component.name}')

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Acritical

Bbackup

Credundancy

Doptional

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing backup with redundancy or optional with critical.

A component is a single point of failure if it is critical and lacks redundancy.

5fill in blank

hard

Fill all three blanks to complete the function that identifies single points of failure in a distributed system.

HLD

def identify_spof(nodes):
    spof_nodes = [node for node in nodes if node.is_[1]() and node.has_no_[2]() and node.depends_on_[3]()]
    return spof_nodes

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Acritical

Bredundancy

Csingle_node

Dbackup

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing backup and redundancy or misunderstanding dependencies.

The function finds nodes that are critical, have no redundancy, and depend on a single node, marking them as single points of failure.