My lab occasionally gets an error of the type IOError with the message "The picture file [name of file] does not exist." We get the error inconsistently and not that often in two different experiments. The one time I have been present to take a look, I opened the file pool inspector and there were no images in the pool. Then I closed and re-opened the experiment, and the pool was full again. Here is the full message from that incident. Thanks for any advice you have.
Upload a clear, close-up, full-color image of yourself on a neutral background to be printed on your LiVE identification card. Do not upload a photo of your driver's license or other existing ID card. *If the uploaded photo is not useable, it will cause a delay in receiving your card.
Product Managers may also use a product-centric version of this same approach to prevent half-complete product features from being exposed to their end users. For example, the product manager of an ecommerce site might not want to let users see a new Estimated Shipping Date feature which only works for one of the site's shipping partners, preferring to wait until that feature has been implemented for all shipping partners. Product Managers may have other reasons for not wanting to expose features even if they are fully implemented and tested. Feature release might be being coordinated with a marketing campaign, for example. Using Release Toggles in this way is the most common way to implement the Continuous Delivery principle of "separating [feature] release from [code] deployment."
Most Ops Toggles will be relatively short-lived - once confidence is gained in the operational aspects of a new feature the flag should be retired. However it's not uncommon for systems to have a small number of long-lived "Kill Switches" which allow operators of production environments to gracefully degrade non-vital system functionality when the system is enduring unusually high load. For example, when we're under heavy load we might want to disable a Recommendations panel on our home page which is relatively expensive to generate. I consulted with an online retailer that maintained Ops Toggles which could intentionally disable many non-critical features in their website's main purchasing flow just prior to a high-demand product launch. These types of long-lived Ops Toggles could be seen as a manually-managed Circuit Breaker. 781b155fdc