Say it like this
- We need to add a circuit breaker to that endpoint.
- The circuit breaker tripped and stopped requests.
- Our circuit breaker is in the open state right now.
Use it at work
Design
- Let's add a circuit breaker so one slow service doesn't take us down.
- The circuit breaker opens after five failed calls.
During an incident
- The circuit breaker tripped, so we're showing cached data.
- The circuit breaker is open. The payment service is still failing.
Review
- What does the user see when the circuit breaker is open?
- How long before the circuit breaker tries again?
Don't say this
Circuit breaker is a noun pattern, not a verb. You implement or add a circuit breaker, not use it as a verb directly.
Don't mix it up
| Term | What it is | Who writes or uses it | When |
|---|---|---|---|
| circuit breaker | Stops calls to a failing service | Backend engineers | After repeated failures |
| retry | Tries a failed call again | Backend engineers | After a single failure |
| timeout | Stops waiting after a set time | Backend engineers | Slow calls |
Practice
Try it
4 quick exercises
1. We should _______ on the payment service to prevent cascading failures during downtime.
2. Your service is failing. How do you describe the solution in a meeting?
3. Which sentence uses circuit breaker incorrectly?
4. Rewrite in tech English: We stopped sending requests to the broken service to protect the rest of the system.
Say it out loud
Phrase 1 of 3
"We need to add a circuit breaker to that endpoint."
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More about circuit breaker
Real examples(3)
- in a standup
"We deployed a circuit breaker for the external API integration to prevent timeouts from affecting the main application."
- in a code review
"This service should have a circuit breaker configured with a 30-second timeout threshold."
- in a team meeting
"The database went down yesterday, but our circuit breaker prevented the entire system from crashing."
More mistakes(2)
Handle with care. Often confused with error handling or exception handling. A circuit breaker is specifically a design pattern that prevents cascading failures by stopping requests to a failing service.
- ✕The circuit breaker handles all errors in our system.✓The circuit breaker prevents cascading failures when a service becomes unavailable.
A circuit breaker does not handle all errors. It specifically prevents requests to failing services, not general error handling.
- ✕Use a circuit breaker instead of error handling.✓Use a circuit breaker in addition to proper error handling for external service calls.
Circuit breaker and error handling serve different purposes. Both are needed in robust systems.
Other forms(3)
- circuit breaker noun
"The circuit breaker protected our system from cascading failures."
- circuit breaker pattern noun phrase
"We implemented the circuit breaker pattern using a third-party library."
- circuit breaker implementation compound modifier
"Our circuit breaker implementation has three states: open, closed, and half-open."
Often used with(5)
- implement a circuit breaker · Adding a circuit breaker to a system or service
- circuit breaker state · Referring to open, closed, or half-open states
- circuit breaker pattern · The design pattern itself in architectural discussions
- circuit breaker library · Software tools like Hystrix, Resilience4j, or Polly that implement circuit breakers
- circuit breaker timeout · The threshold for how long before a circuit breaker opens
Similar words(3)
- fault tolerance mechanism · More general term; circuit breaker is a specific implementation
- failover strategy · Related but broader; circuit breaker is a specific pattern
- resilience pattern · Umbrella term; circuit breaker is one specific pattern
Opposites(2)
- cascading failure
- system outage
Questions(5)
- What does circuit breaker mean in software engineering?
- A circuit breaker is a design pattern that prevents an application from repeatedly trying to execute an operation that is likely to fail. It monitors for failures and temporarily stops requests to a failing service, allowing it time to recover. This protects the entire system from cascading failures where one broken service brings down other services that depend on it.
- What are the three states of a circuit breaker?
- Closed: The circuit breaker allows requests through normally. Open: The circuit breaker blocks requests because the service is failing, and returns an error or cached response. Half-open: The circuit breaker allows a small number of test requests to check if the service has recovered.
- How do you use circuit breaker in a sentence at work?
- You typically use it as a noun: We need to implement a circuit breaker on that API endpoint. Or We have a circuit breaker protecting the database connection. You can also say The circuit breaker is currently open because the service is unavailable.
- Is circuit breaker formal or informal?
- Circuit breaker is neutral in formality. It is a standard technical term used in both casual team conversations and formal architectural documentation. You can use it in standups, code reviews, design meetings, and documentation without sounding too casual or too formal.
- Why is a circuit breaker important?
- Circuit breakers improve system resilience by preventing cascading failures. When one service goes down, a circuit breaker stops the rest of the system from wasting resources trying to call it, and instead returns quick error responses. This gives the failing service time to recover without bringing down the entire application.
