Grokking Staff Engineer Interview
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Reversible and Irreversible Decisions

Here are six decisions that engineers at the marketplace faced during the scheduler project and the months around it. Before reading further, sort them into two groups: decisions that are easy to undo, and decisions that are hard or impossible to undo.

  1. Upgrade the HTTP client library in the search service by one minor version.
  2. Raise the default job timeout in the new scheduler from 30 to 45 minutes.
  3. Turn on a new search ranking model for 5 percent of buyers.
  4. Choose the database that will store job definitions and run history for the new scheduler. 5

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