Hi all, I am evaluating online storage and for me, that means either Amazon S3 or Google Docs. Amazon very clearly posts there reliability and SLA: http://aws.amazon.com/s3/#protecting Their rates are obviously higher than Google's, but it is really hard to compare without having an SLA. Does anyone know what Google's commitment is f...
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 crashes while its operating or running, i d like the application to run again for the same peri...
Hello, We need to write software that would continuously (i.e. new data is sent as it becomes available) send very large files (several Tb) to several destinations simultaneously. Some destinations have a dedicated fiber connection to the source, while some do not. Several questions arise: We plan to use TCP sockets for this task. Wh...
I am looking for a comparison of django and flask for a project that will live for a long time, and will need to be maintained, built upon and grow as the months progress. I am considering Flask + SQLAlchemy or django. I do not need batteries, as I usually end up having to modify them, so it is fine if I have to re-implement a couple o...
I need to create a WCF service (duplex, because it's also about Silverlight and a lot of localhost - stuff, it's a very complicated, legacy - bound situation here...) which will accept multiple sessions, is able to send notifications to multiple clients, and nothing must be blocking. So my first attempt was to create a class that employ...
Consider the following (simplified) code: enum eTestMode { TM_BASIC = 1, // 1 << 0 TM_ADV_1 = 1 << 1, TM_ADV_2 = 1 << 2 }; ... int m_iTestMode; // a "bit field" bool isSet( eTestMode tsm ) { return ( (m_iTestMode & tsm) == tsm ); } void setTestMode( eTestMode tsm ) { m_iTestMode |= tsm...
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 achieved in this system where messages are queued in transient memory. I understand that a ...
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: http://stackoverflow.com/questions/3530165/monitoring-user-sessions-to-prevent-editing-conflict) My (rather limited) reading on the un...
More and more of the noSQL databases that are in the spotlight uses the master/slave pattern to provide "availability", but what it does (at least from my perspective) is creating the weak link in a chain that will break anytime. - Master goes down, slaves stops to function. It's a great way to handle big amounts of data and to even out...
InterBase had an architecture that caused disk-writes to leave the database in an always-consistent state -- 97 things every software architect should know, p87 Is this property finally common in 2010 ? Is there a study about database stability/reliability in presence of disk errors ? ...
How can using something like MSMQ help with scalability and reliability? In the scenario of one web server to one database server does it help at all? Any comments or links would be greatly appreciated. Thanks EDIT: The web server will be running WCF exposing SOAP style web methods. There is also a possibility, looking to the future, ...
Hi, I know that pretty much every programming language has a method to check the existence of a file or directory. However, in my case, a file is made which stores program settings. If it does not exist (ie !File.Exists or Directory.Count == 0 where Directory is the containing directory of the file), then prompt for some settings to be...
The netTcpBidning has a reliable property, but the documentation doesn't state what it does. For instance: Do it send keep-alives over the connection? Do it reconnect if connection is lost? ...