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Questions tagged [reliability]

Reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.

Reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time.

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Erlang's 99.9999999% (nine nines) reliability

Erlang was reported to have been used in production systems for over 20 years with an uptime percentage of 99.9999999%. I did the math as the following: 20*365.25*24*60*60*(1 - 0.999999999) == 0.631 s That means the system only has less than one…
Ning
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Are Erlang/OTP messages reliable? Can messages be duplicated?

Long version: I'm new to erlang, and considering using it for a scalable architecture. I've found many proponents of the platform touting its reliability and fault tolerance. However, I'm struggling to understand exactly how fault-tolerance is…
joshng
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Can the unload Event be Used to Reliably fire ajax Request?

I need a method to monitor user edit sessions, and one of the solutions I'm reviewing will have me using an unload event to send an ajax request to inform the server of the end of the edit session. (See: Monitoring User Sessions to Prevent Editing…
Yi Jiang
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Facebook Graph API - get ID for a URL?

This seems like a pretty obvious, basic thing to expect from the Graph API, but I'm having serious difficulty with it. All I want to do is get the ID for any particular URL. They have a method for…
Dusda
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Redis - Better way of cleaning the processing queue(reliable) while using BRPOPLPUSH

Our Current Design Env Redis 2.8.17 We have implemented our reliable queue, using the pattern similar to the one described in redis documentation, under RPOPLPUSH However, we are using BRPOPLPUSH considering its blocking nature, and LPUSH for…
aspdeepak
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Fail Fast vs. Robustness

Our product is a distributed system. The modules I work on are fairly new, quite rigorous, well tested. They were developed with recent best practices in mind. Other modules can be considered as legacy software. While I'm vigilant about everything…
tolak
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Does Windows Azure offer static IP for VMs?

I have been trialling the Bizspark / Azure offer for my company. When we accidentally exceeded our free usage limit by 1c, Microsoft deleted our VMs and handed our IP addresses to other customers. This was done instantly, out of hours and without…
Francesca Goldsmith
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How do I address sudden loss of connection to SQL Azure in my Azure role?

My Azure role grabs stuff to process from a database - it holds an instance of System.Data.SqlClient.SqlConnection and periodically creates an SqlCommand instance and executes an SQL query. Now once in a while (usually once in several days) running…
sharptooth
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What to use ? time() function or $_SERVER['REQUEST_TIME'] ? Which is better?

Which one among these two time functions is better? I have a form on my website which is submitted by thousands of users every microsecond or less , thus , thousands of requests at the same time on my server. So I want to use the one which does not…
sqlchild
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Android timer that works when device is sleeping

I'm writing a sports app that needs to track the elapsed time of quarter/half/period. Elapsed time needs to be accurate to the second. The game clock needs to continue to run even if the user explicitly places the device in sleep mode by pressing…
Rich
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Best Practices of fault toleration and reliability for scheduled tasks or services

I have been working on many applications which run as windows service or scheduled tasks. Now, i want to make sure that these applications will be fault tolerant and reliable. For example; i have a service that runs every hour. if the service…
DarthVader
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Coding for high reliability/availability/security - what standards do I read?

I've heard that the automotive industry has something called MISRA C. What are the relevant standards for other high reliability/availability/security industries, such…
Adam Davis
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S3 high-availability + reliability for backups

I did some research on this, but wasn't able to find any substantial answers, so turning to StackOverflow. How reliable is Amazon's S3 in terms of high-availability and reliability? I realize there are SLAs for it, but what about if a availability…
Suman
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When does ExecuteCodeWithGuaranteedCleanup actually guarantee cleanup?

I have been reading about Reliability Features in .NET and have written the following class to explore ExecuteCodeWithGuaranteedCleanup class Failing { public void Fail() { RuntimeHelpers.PrepareConstrainedRegions(); try …
Richard Ev
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Is a Qt-based UI reliable enough to be used in a medical device?

I work for a small company developing a complex medical device with a rich UI. We are currently at the early stages of design. The application is targeted for Windows (desktop only) and preferably should be written only in C++. After some research…
user1526557
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