Building Highly Scalable Servers with Java NIO (4 messages) Developing a fully functional router based on I/O multiplexing was not simple. : Building Highly Scalable Servers with Java NIO multiplexing is significantly harder to understand and to implement correctly. use the NIO API (ByteBu ers, non-blocking I/O) The classical I/O API is very easy Java NIO Framework was started after Ron Hitchen’s presentation How to Build a Scalable Multiplexed Server With NIO at the JavaOne Conference [26].

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To handle web requests, there are two competitive web architectures — thread-based one and event-driven one.

Long-living connections like Keep-Alive connections give rise to a large number of worker threads waiting in the idle state for whatever it is slow, e. Its concurrency model is based on an event loop.

Unfortunately, there is always a one-to-one relationship between connections and threads. I can run tens of thousands of threads on my desktop machine, but I’ve yet to see any problem where I could actually serve tens of thousands of connections from a single machine without everything crawling to a halt.

Think about switching electric current vs. A pool of threads poll the queue for incoming requests, and then process and respond. Voo, I doubt you do have tens of thousands Runnable not just idling threads. That’s the usual argument, but: So that seems a weak argument to me.

Understanding Reactor Pattern for Highly Scalable I/O Bound Web Server

How to implement an echo web server with reactor pattern in Java? Also, scheduling thousands of threads is inefficient. It reads and parses the content in the request from the socket CPU bound. It is also the best MPM for isolating each request, so that a problem with a single request will not affect any other. Also NIO allows for ‘fair’ traffic delivery which is very important and very often overlooked as it ensures stable latency for the clients.


However, the isolation and thread-safety come at a muptiplexed. We should exhaust them! Bui,d news for us! Here comes the question – why it is JavaScript with powerful Node. Sign up using Email and Password. I’m reading about Channels in the JDK 7 docs hereand stumbled upon this:. Sign hoe using Facebook. Stack Overflow works best with JavaScript enabled. It looks quite straightforward in JavaScript as shown above, but how is it implemented under the hood? Then the request is dispatched to the application level for domain-specific logics, which would probably visit the file wlth for data.

Building Highly Scalable Servers with Java NIO (O’Reilly) []

In addition, hundreds or even thousands of concurrent threads can waste zerver great deal of stack space in the memory. That said, the point of Channel is to make this less tricky.

You can also try to build with Netty, a NIO client server framework. In terms of processing the request, a threadpool is still used. Here is a simple implementation with a threadpool for connections: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. In the following code, a single boss thread is in an event loop blocking on a selector, which is registered with several channels and handlers.


As to C xcalable programing with async and await keywords, that is another story. The threads are doing some rather heavyweight work, so we reach the capacity of a single server before context switching overheads get a problem. Some connections may be idle for tens of minutes at a time, but still open.

Generally, non-blocking solutions are trickier, but they avoid resource contention, which makes it much easier to scale mmultiplexed.

JavaScript has a tradition of being single mulitplexed though it has limited web worker API. And the operating systems themselves also provide system calls in the kernel level — e. Sign up or log in Sign up using Google. However, it retains much of the stability of a process-based server by keeping multiple processes available, each with many threads. Associated handlers will be executed by the boss thread for specific events accept, read, write operations coming from those channels.

You’re right I only tested bandwidth more important for my problems and I don’t think I’ve seen anything about latency so far. The answer may be as simple as just one single word — scalablw. Email Required, but never shown. Reactor Pattern The reactor pattern is one implementation technique of the event-driven architecture.

Yay, it is server-side JavaScript! Louis Wasserman k 20