BTW a reminder that this happens on other sites besides Facebook; a member tried to post a link to a video page on xvideos.com and it failed as well. (NSFW warning! That is VERY MUCH an adult site!) I tested it with a handful of other sites and found the same.

Note that the failing video onebox usually indicates that the error is in the site you are trying to embed. In case of Facebook, it was Facebook being too restrictive and allowing video playback for a certain time only.


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Failure is part of engineering any large-scale system. One of Facebook's cultural values is embracing failure. This can be seen in the posters hung around the walls of our Menlo Park headquarters: "What Would You Do If You Weren't Afraid?" and "Fortune Favors the Bold."

To keep Facebook reliable in the face of rapid change we study common patterns in failures and build abstractions to address them. These abstractions ensure that best practices are applied across our entire infrastructure. To guide our work in building reliability abstractions we must understand our failures. We do this by building tools to diagnose issues and by creating a culture of reviewing incidents in a way that pushes us to make improvements that prevent future failures.

Often an individual machine will run into an isolated failure that doesn't affect the rest of the infrastructure. For example, maybe a machine's hard drive has failed, or a service on a particular machine has experienced a bug in code, such as memory corruption or a deadlock.

The key to avoiding individual machine failure is automation. Automation works best by combining known failure patterns (such as a hard drive with S.M.A.R.T. errors) with a search for symptoms of an unknown problem (for example, by swapping out servers with unusually slow response times). When automation finds symptoms of an unknown problem, manual investigation can help develop better tools to detect and fix future problems.

These two data points seem to suggest that when Facebook employees are not actively making changes to infrastructure because they are busy with other things (weekends, holidays, or even performance reviews), the site experiences higher levels of reliability. We believe this is not a result of carelessness on the part of people making changes but rather evidence that our infrastructure is largely self-healing in the face of non-human causes of errors such as machine failure.

While failures have different root causes, we have found three common pathologies that amplify failures and cause them to become widespread. For each pathology, we have developed preventative measures that mitigate widespread failure.

Configuration systems tend to be designed to replicate changes quickly on a global scale. Rapid configuration change is a powerful tool that can let engineers quickly manage the launch of new products or adjust settings. However, rapid configuration change means rapid failure when bad configurations are deployed. We use a number of practices to prevent configuration changes from causing failure.

For reliability purposes, however, A/B tests do not satisfy all of our needs. A change that is deployed to a small number of users, but causes implicated servers to crash or run out of memory, will obviously create impact that goes beyond the limited users in the test. A/B tests are also time consuming. Engineers often wish to push out minor changes without the use of an A/B test. For this reason, Facebook infrastructure automatically tests out new configurations on a small set of servers. For example, if we wish to deploy a new A/B test to 1 percent of users, we will first deploy the test to 1 percent of the users that hit a small number of servers. We monitor these servers for a short amount of time to ensure that they do not crash or have other highly visible problems. This mechanism provides a basic "sanity check" on all changes to ensure that they do not cause widespread failure.

Some failures result in services having increased latency to clients. This increase in latency could be small (for example, think of a human configuration error that results in increased CPU usage that is still within the service's capacity), or it could be nearly infinite (a service where the threads serving responses have deadlocked). While small amounts of additional latency can be easily handled by Facebook's infrastructure, large amounts of latency lead to cascading failures. Almost all services have a limit to the number of outstanding requests. This limit could be due to a limited number of threads in a thread-per-request service, or it could be due to limited memory in an event-based service. If a service experiences large amounts of extra latency, then the services that call it will exhaust their resources. This failure can be propagated through many layers of services, causing widespread failure.

Resource exhaustion is a particularly damaging mode of failure because it allows the failure of a service used by a subset of requests to cause the failure of all requests. For example, imagine that a service calls a new experimental service that is only launched to 1% of users. Normally requests to this experimental service take 1 millisecond, but due to a failure in the new service the requests take 1 second. Requests for the 1% of users using this new service might consume so many threads that requests for the other 99% of users are unable to run.

Since one of the top causes of failure is human error, one of the most effective ways of debugging failures is to look for what humans have changed recently. We collect information about recent changes ranging from configuration changes to deployments of new software in a tool called OpsStream. However, we have found over time that this data source has become extremely noisy. With thousands of engineers making changes, there are often too many to evaluate during an incident.

Facebook's infrastructure provides safety valves: our configuration system protects against rapid deployment of bad configurations; our core services provide clients with hardened APIs to protect against failure; and our core libraries prevent resource exhaustion in the face of latency. To deal with the inevitable issues that slip through the cracks, we build easy-to-use dashboards and tools to help find recent changes that might cause the issues under investigation. Most importantly, after an incident we use lessons learned to make our infrastructure more reliable.

Diptanu Gon Choudhury, Timothy Perrett - Designing Cluster Schedulers for Internet-Scale Services

Engineers looking to build scheduling systems should consider all failure modes of the underlying infrastructure they use and consider how operators of scheduling systems can configure remediation strategies, while aiding in keeping tenant systems as stable as possible during periods of troubleshooting by the owners of the tenant systems.

I am trying to slowly abandon Authy in favor of Bitwarden when it comes to TOTP.

But it all crashed when it came to Facebook.

I tried both methods> QR Code and manual copy paste of the key, but nothing: TOTP for Facebook never works.

Strange enough when I set up TOTP for Instagram (which is done from the same security settings page in facebook) it perfectly works.

I think you guys need to improve compatibility.

Facebook has been the central social network that connects people from all over the world and all parts of your life. There are a lot of great things Facebook offers: the chance to reconnect with old friends, share your photos, list your likes, join interest groups, and more. Despite the many wonders the social network offers, we felt that Facebook, boasting approximately 800 million active users and an estimated $4.27 billion in annual revenue, was overdue for a critique. When Facebook released their iPad social utility app in October, which many considered a disappointing failure of an application, we decided it was time to file a list of Facebook failure grievances.

After reviewing HAR files we can see in our internal logs, that the Login was successful both times. In the failed traces, it stopped just before the token exchange. But the authentication code was issued.

When you login for the second time, since the session already exists in Auth0, we will redirect to the defined callback URL right after you reach the /authorize endpoint.

On the first attempt, the /authorize endpoint will redirect to the login, then to Facebook. After the authentication on Facebook, it redirects back to Auth0, where we exchange the Facebook auth code against their token, and finally redirect back to application callback URL.

In practice, the problem is as the support engineers told you, but looking a bit deeper into the problem, it seems that the state parameter is not missing, but changed by FB. FB adds a #_=_ suffix to it and causes the state validation to fail.

Others have this problem as well and the suggested workaround is to remove the suffix before the validation.

Facebook Ads has become one of the most effective social media marketing tools for businesses today. It maximizes brand exposure, brings targeted leads, and generates revenues. But even it could fail.

Facebook Ads may also fail because it lacks focus. The business may try to accomplish too many objectives with a single ad. The message becomes diluted and the target market confused. This situation may result in ignored or, even worse, disliked ads.

When creating Facebook Ads, businesses often forget to check the destination link. A broken link will result in a failed ad and a wasted budget. After all, you are paying to drive traffic to your website or landing page.

Many businesses often skip A/B or split testing because it takes time and effort. But without it, you would not know which ad performs better and what needs to be improved. As a result, your Facebook Ads may fail to meet your expectations.

Another reason Facebook Ads fail is due to poor budget allocation. This usually happens when businesses are too stingy with their ad spending or do not properly track their results. In turn, they cannot scale up their campaigns and reach their desired return on investment (ROI). e24fc04721

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