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  • <p>This PR implements a scheme where we try to acquire locks one-by-one, and if any fail (quickly), let go of all currently held locks in that group. The overall timeout still applies, but it applies ...
  • s try to get this repo into the Discussions beta <p>I just learned that GitHub has introduced <a href="https://github.com/zeit/next.js/discussions">Discussions in beta</a>. <p>Let's get rid of ...
  • When you let go of the controls, the ship rotates back to the steering setting it had when kOS module was still on. There appears to be NO way to undo this. <code>lock steering</code> and <code>...
  • ve decided to try seafile i've installed both server and the client. After some hours of unsuccessful attempts to get it working with ssl and windows server i notice that once i put the url of the...
  • It was all about trying to pass additional info into the <code>Capture*</code> methods. Unfortunately, the way I chose to do it (variadics pulled apart by type switches) wasn't type safe, which ...
  • I highly approve of this approach, and it means users can get new fixes and features when they want them (rather than relying on me to release them first).</li><li>We <em>will NOT</em> try to avoid ...
  • Let it crash philosophy part II Designing fault tolerant systems is extremely difficult. You can try to anticipate and reason about all of the things that can go wrong with...

    Designing fault tolerant systems is extremely difficult.  You can try to anticipate and reason about all of the things that can go wrong with your software and code defensively for these situations, but in a complex system it is very likely that some combination of events or inputs will eventually conspire against you to cause a failure or bug in the system.

    In certain areas of the software community such as Erlang and Akka, there’s a philosophy that rather than trying to handle and recover from all possible exceptional and failure states, you should instead simply fail early and let your processes crash, but then recycle them back into the pool to serve the next request.  This gives the system a kind of self healing property where it recovers from failure without ceremony, whilst freeing up the developer from overly defensive error handling.

    I believe that implementing let it crash semantics and working within this mindset will improve almost any application – not just real time Telecoms system where Erlang was born.  By adopting let it crash, redundancy and defence against errors will be baked into the architecture rather than trying to defensively anticipate scenarios right down in the guts of the code.  It will also encourage you to implement more redundancy throughout your system.

    Also ask yourself, if the components or services in your application did crash, how well would your system recover with or without human intervention?  Very few applications will have a full automatic recoverability property, and yet implementing this feels like relatively low hanging fruit compared to writing 100% fault tolerant code.

    So how do we start to put this into practice?

    At the hardware level, you can obviously look towards the ‘Google model’ of commodity servers, whereby the failure of any given server supporting the system does not lead to a fatal degradation of service.  This is easier in the cloud world where the economics encourage us to use a larger number of small virtualised servers.   Just let them crash  and design for the fact that servers can die at a moments notice.

    Your application might be comprised of different logical services. Think a user authentication service or a shopping cart system. Design the system to let entire services crash . Where appropriate, your application should be able to proceed and degrade gracefully whilst the service is not available, or to fall back onto another instance of the service whilst the first one is recycling.  Nothing should be in the critical code path because it might crash!

    Ideally, your distributed system will be organised to scale horizontally across different server nodes.  The system should load balance or intelligently route between processes in the pool, and different nodes should be able to join or leave the pool without too much ceremony or impact to the application.  When you have this style of horizontal scalability, let nodes within your application crash and rejoin the pool when they’re ready.

    What if we go further and implement let it crash semantics for our infrastructure?

    For instance, say we have some messaging system or message broker that transports messages between the components of your application.  What if we let that crash and come back online later.  Could you design the application so that this is not as fatal as it sounds, perhaps by allowing application components to write to or dynamically switch between two message brokers?

    Distributed NoSQL data stores gives us let it crash capability at the data persistence level.  Data will be stored in some distributed grid of nodes and replicated to at least 2 different hardware nodes.  At this point, it’s easier to let database nodes crash than try to achieve 100% uptime.

    At the network level, we can design topologies such that we do not care if routers or  network links crash because there’s always some alternate route through the network.   Let them crash and when they come back the optimal routes will be there ready for our application to make use of again in future.

    Let it crash is more than simple redundancy.  It’s about implementing self recoverability of the application.  It’s about putting your site reliability efforts into your architecture rather than low level defensive coding.  It’s about decoupling your application and introducing asynchronicity in recognition that things go wrong in surprising ways.  Ironically, sitting back and cooly letting your software crash can lead to better software! 

    posted on 2015-12-30 18:07 Len3d 阅读(...) 评论(...) 编辑 收藏

    转载于:https://www.cnblogs.com/len3d/p/5089668.html

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  • s not, it listens to the <a href="https://developer.mozilla.org/en-US/docs/Web/API/NavigatorOnLine/Online_and_offline_events">online event</a> and once the player is back online, it will try to reload...
  • <div><h1>Changes proposed in this pull ... it for the night in a building.</li><li>Or at least, will try to.</li></ul> <p>Review please</p><p>该提问来源于开源项目:ldtteam/minecolonies</p></div>
  • But this seems fine --- it lets us have exact control over which files go in the package. But maybe <code>vsce</code> pays attention to the <code>"files"</code> section in <code>package.json,...
  • <p>The problem is that if you use the Search ui field to try to find an Entry, for example, the Search field goes blank but Search remains in force, should you go on to look at other categories of the...
  • <p>Never mind, it seems that the keybinding <em>is</em> go-to-defintion, but it is not working correctly. <p>From <code>parser.ts</code></p> <pre><code> TypeScript module ts { var nodeConstructors &#...
  • Any plan to go reactive

    2020-11-28 07:39:04
    If JDBI starts moving towards supporting reactive paradigm (or atleast support RxJava), it would be awesome, and will lead to better adoption of JDBI to the market. I am a java dev/architect with some...
  • <p>If I try to build that via <code>go install</code> I get a compile error in the generated code: <pre><code> $ go install github.com/ereyes01/gqlgen-interface-bug/shapes/server # github....
  • <p>But I am wondering is it possible to do the following: <ol><li>make the layout horizontally symmetric</li><li>reserve the order of edge labels <code>One, <code>Two</code> & <code>Three</code>....
  • ll let the test run for a couple of hours and report whether it runs fine. - <a href="https://github.com/drdanz"><img border="0" src="https://avatars.githubusercontent.com/u/1100056?v=3" height=...
  • Let them try. Auto assign for everything just to start. </li><li></li><li></li><li>... Profit</li></ol> <p>SIDENOTE: At the moment, since I know you guy sare probably really busy on this, (thank you ...
  • <div><p>I have created the persistent volume , persistent volume clame , deployment and service and in deployment when i include the persistentVolumeClaim tag in the volumes tag it is struck in the &#...
  • <h2>What did we try to solve in the spike? <ul><li>Stacktrace</li><li>Performance</li></ul> <h2>What approaches did we see? <ul><li>Using a monadic model instead of async/await</li><li>Implemenent ...
  • <ul><li>start playing a video</li><li>double click (or double tap) on the container</li><li>it should just go fullscreen without affecting playback, but it pauses and resumes instead</li></ul> ...
  • file (using gomobile bind) and include it in my android project and try to run. i get following error log <p>I/GoLog: "unable to open database file: no such file or directory": create ...
  • If needed I can try it with other quads i have, let me know if you need that or any other info to resolve this problem. I would really like to be able to fly all my quads using the xlite and I have ...
  • 3. go to the use of <code>toColor</code> (l.135) and try to go to definition: it works 4. go to the use of <code>fromColor</code> (l.140) and try to go to definition: it does not work <h2>Context <p>...
  • <div><p>Upon long pressing on the toolbar--it will display an <code>EditText</code> field that lets ... Give it a try, let me know what you think.</p><p>该提问来源于开源项目:ccrama/Slide</p></div>
  • Please try to reconnect} <h4>Issue type <ul><li>[ X] bug</li><li>[ ] missing functionality</li><li>[ ] performance</li><li>[ ] feature request</li></ul> <h4>Brief description <p>once the websocket ...
  • # Try to detect WM windows (a non-override-redirect window with no # child that has 'WM_STATE') and mark them as active. # # mark-wmwin-focused = false mark-wmwin-focused = true; # ...
  • So I would really appreciate it if <code>cargo watch</code> could wait like 100ms to let <code>cargo check</code> go first :)</p><p>该提问来源于开源项目:passcod/cargo-watch</p></div>
  • <div><p>As a personal study project, I try to implement (in next weeks) a motorcycle + driver, driving over a bridge .. <p>One way would be taking <strong>mixamo</strong> stuff .. <p>But I found ...
  • <ul><li>No surprises (apart from the complexity) - it behaves just as one would expect.</li><li>Very flexible - allows a lot of freedom in choosing how to react to channel events.</li></ul> ...
  • t move when releasing it and you can watch it jump when you let it go. It is now impossible to drag it back on top of the second item that was never moved, because they are now locked to different 50 ...

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