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Release It!, 2nd Edition by Michael T. Nygard

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Governor

In Force Multiplier, we looked into an outage that Reddit.com suffered. As a quick reminder, Reddit’s configuration management system restarted a part of its infrastructure management that scales server instances up and down. This was in the middle of a ZooKeeper migration, so the autoscaler read a partial configuration and decided to shut down nearly every machine instance in Reddit.

The flip side of that coin is a job scheduler that spins up too many compute instances in order to process a queue before a deadline. The work still can’t get done fast enough, and, to add insult to injury, the cloud provider’s invoice that month is written in scientific notation.

Automation has no judgment. When it goes wrong, it tends to go wrong ...

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