Application lifecycle in YARN in Hadoop - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the correct sequence of YARN application lifecycle stages

Which of the following sequences correctly represents the main stages of an application lifecycle in YARN?

A 3,2,1,4

B 2,1,3,4

C 1,3,2,4

D 1,2,3,4

💡 Hint

Think about what happens first when you start a YARN application.

The application lifecycle in YARN starts with submission, then resource allocation by the ResourceManager, followed by execution by NodeManagers, and finally completion.

❓ data_output

intermediate

Determine the final status of a YARN application

Given the following YARN application states: SUBMITTED, ACCEPTED, RUNNING, FINISHED, FAILED, KILLED. What is the final status of an application that completed successfully?

A RUNNING

B FINISHED

C FAILED

D KILLED

💡 Hint

Think about what status means the application ended without errors.

FINISHED indicates the application completed successfully without errors.

❓ Predict Output

advanced

Output of YARN application state transitions in logs

What will be the output of the following pseudo-log snippet showing YARN application state transitions? ``` states = ['SUBMITTED', 'ACCEPTED', 'RUNNING', 'FINISHED'] for i, state in enumerate(states): print(f"State {i+1}: {state}") ```

Hadoop

states = ['SUBMITTED', 'ACCEPTED', 'RUNNING', 'FINISHED']
for i, state in enumerate(states):
    print(f"State {i+1}: {state}")

A

State 0: SUBMITTED
State 1: ACCEPTED
State 2: RUNNING
State 3: FINISHED

B

State 1: SUBMITTED
State 2: RUNNING
State 3: ACCEPTED
State 4: FINISHED

C

State 1: SUBMITTED
State 2: ACCEPTED
State 3: RUNNING
State 4: FINISHED

D

SUBMITTED
ACCEPTED
RUNNING
FINISHED

💡 Hint

Remember that enumerate starts counting from 0 by default, but the code adds 1.

The code prints each state with its index starting at 1, so the output matches option C exactly.

🔧 Debug

advanced

Identify the error in YARN application state update code

What error will the following Python code raise when simulating YARN application state updates? ``` states = ['SUBMITTED', 'ACCEPTED', 'RUNNING', 'FINISHED'] for i in range(5): print(states[i]) ```

Hadoop

states = ['SUBMITTED', 'ACCEPTED', 'RUNNING', 'FINISHED']
for i in range(5):
    print(states[i])

A IndexError: list index out of range

B TypeError: 'int' object is not iterable

C SyntaxError: invalid syntax

D No error, prints all states

💡 Hint

Check the length of the list and the range used in the loop.

The list has 4 elements indexed 0 to 3, but the loop tries to access index 4 causing IndexError.

🚀 Application

expert

Calculate total resource usage time for a YARN application

A YARN application requests 4 containers. Each container runs for 10 minutes. The application master runs for 5 minutes before containers start and 3 minutes after all containers finish. What is the total resource usage time in minutes for this application?

A 48

B 43

C 40

D 53

💡 Hint

Add the application master time and the total container time.

Application master runs 5 + 3 = 8 minutes. Containers run 4 * 10 = 40 minutes. Total is 8 + 40 = 48 minutes.