Retry with exponential backoff in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the initial retry delay.

Microservices

retryDelay = [1]

Drag options to blanks, or click blank then click option'

A1000 # milliseconds

B5 # attempts

Ctrue # enable retry

D0 # no delay

Attempts:

3 left

💡 Hint

Common Mistakes

Using retry count instead of delay

Setting delay to zero disables backoff

The initial retry delay is usually set in milliseconds, here 1000ms means 1 second.

2fill in blank

medium

Complete the code to calculate the next retry delay using exponential backoff.

Microservices

nextDelay = retryDelay * (2 [1] attempt)

Drag options to blanks, or click blank then click option'

A**

B-

C+

D//

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of power

Using integer division instead of power

Exponential backoff multiplies the delay by 2 to the power of the attempt number.

3fill in blank

hard

Fix the error in the retry condition to stop after max attempts.

Microservices

if attempt [1] maxAttempts:
    stopRetrying()

Drag options to blanks, or click blank then click option'

A<=

B==

C>=

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' which allows too many retries

Using '==' which may miss some cases

The retry should stop when the attempt count is greater than or equal to the max allowed attempts.

4fill in blank

hard

Fill both blanks to implement jitter in the retry delay calculation.

Microservices

import random
jitter = random.[1](0, retryDelay)
nextDelay = retryDelay [2] jitter

Drag options to blanks, or click blank then click option'

Arandint

B+

C-

Drandom

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'random' instead of 'randint'

Subtracting jitter instead of adding

Jitter adds randomness to the delay to avoid retry storms. randint generates a random integer, and '+' adds it to the base delay.

5fill in blank

hard

Fill all three blanks to implement a capped exponential backoff with jitter.

Microservices

maxDelay = 30000
baseDelay = 1000
attempt = 3
rawDelay = baseDelay * (2 [1] attempt)
cappedDelay = min(rawDelay, [2])
jitter = random.[3](0, cappedDelay)
finalDelay = cappedDelay + jitter

Drag options to blanks, or click blank then click option'

A**

BmaxDelay

Crandint

DbaseDelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '**' for exponent

Using baseDelay instead of maxDelay for cap

Using random instead of randint for jitter

The delay grows exponentially with '**', is capped by maxDelay, and jitter is added using randint.