Evaluate failures and bound repeated work
Bound repeated work and describe what the teaching cache does not prove.
Reviewed: 2026-10-03
Source-based teaching example · Fictional data
Narration: Microsoft Mark · locally synthesized

00:00:00.000 — What you will learn

Bound repeated work and describe what the teaching cache does not prove.

Visual description:
Bound repeated work and describe what the teaching cache does not prove.

00:00:07.000 — The idea

Recognize retries of the same intended operation. Stop when evidence is missing instead of guessing through more attempts. Explain storage and concurrency limits.

Visual description:
Recognize retries of the same intended operation. Stop when evidence is missing instead of guessing through more attempts. Explain storage and concurrency limits.

00:00:20.625 — One useful term

Idempotency. Repeated attempts at the same operation have one intended effect rather than duplicate effects.

Visual description:
Repeated attempts at the same operation have one intended effect rather than duplicate effects.

00:00:30.500 — A worked example

Operation K creates output A once. Repeating K returns its recorded result. A new request with no evidence stops rather than retrying until an answer sounds right.

Visual description:
Operation K creates output A once. Repeating K returns its recorded result. A new request with no evidence stops rather than retrying until an answer sounds right.

00:00:44.583 — Your turn to think

Does an in-memory teaching cache prove persistence across restarts? Pause and decide before continuing.

Visual description:
Does an in-memory teaching cache prove persistence across restarts?
Pause the video if you need more time.

00:01:02.375 — Why this answer works

No. The exercise does not establish persistence, concurrency handling or live-provider behavior.

Visual description:
No. The exercise does not establish persistence, concurrency handling or live-provider behavior.

00:01:12.250 — Check 1

Count actual executions.

Visual description:
Count actual executions.

00:01:17.250 — Check 2

Apply the retry limit.

Visual description:
Apply the retry limit.

00:01:21.792 — Check 3

Record untested durability and concurrency.

Visual description:
Record untested durability and concurrency.

00:01:27.625 — Now try a different case

Open the lesson and try its different practice case. Use every check in the full task. Watching alone does not mark the lesson complete.

Visual description:
Open the lesson
Try the new case
Check and revise
The full task and its requirements are in the linked lesson.