At Facebook,an Automated System for Verifying Configuration Value Errors Backfired,causing

question 32

True/False

At Facebook,an automated system for verifying configuration value errors backfired,causing every single client to try to fix accurate data it perceived as invalid.Since the fix involved querying a cluster of databases,that cluster was quickly overwhelmed by hundreds of thousands of queries a second.The resultant crash took the Facebook system offline for two-and-a-half hours.

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Definitions:

Mixed Cost

A cost containing both variable and fixed cost elements, changing in total with activity level but not proportionately.

Direct Labor Hours

The total time workers spend producing a product or providing a service, directly tied to the production process.

Contribution Margin Ratio

A financial metric that shows what percentage of sales revenue is available to cover fixed costs and generate profit after variable costs have been paid.

Variable Costs

Costs that change in proportion to the level of activity or volume of goods produced by a business.