polly poll

The API gateway Ocelot uses Polly to handle some failures. In the process of implementing the API Gateway, another issue that needs to be considered is part of failure. This problem occurs in distributed systems when one service calls another service and times out or is unavailable. API Gateway should not be blocked and wait for downstream services indefinitely. However, how to handle such failures depends on specific scenarios and specific services.

LindDotNetCore ~ The value of Polly components in microservice scenarios, Back to directory Polly is an open-source framework that can be found on github. It has been indexed by hoyou and is also a member of. App vNext! App vNext: https://github.com/App-vNext GitHub: https://github.com/App-vNext/Polly NanoFabric is an open source microservice architecture, is als

Back to CatalogPolly is an open-source framework that can be found on GitHub, and is also a good friend of the Big Brother. A member of APP Vnext!APP Vnext:https://github.com/app-vnextGithub:https://github.com/app-vnext/pollyNanofabric is an open source micro-service architecture, also recommended by good friend Brother: Https://github.com/geffzhang/NanoFabricFor Nanofabric, it integrates a number of. NET core open source projects, including Consul +. NET core +

Preface Speak Up AOP, in fact, we should do mvc/api when there should be no less contact, for example, all kinds of fitter is a typical AOP.originally in use Polly I was originally intended to use the filter to achieve, and later found to be quite difficult to achieve, the use of netcore in the middle and filter to achieve an AOP independent application services It's just, I'm a little helpless, quite difficult to write.And then it was used, AUTOFAC i

Another problem that needs to be considered in implementing the API gateway is partial failure. This problem occurs in distributed systems where a service invokes another service timeout or is not available. API gateway should not be blocked and wait indefinitely for downstream service status. However, how to handle this failure depends on the specific scenario and the specific service. If the product information service is unresponsive, then API Gateway should return an error to the client.

Linux select and poll implementation mechanism and instance analysis, poll instance analysisWe can implement blocking operations until the upper layer combines select and poll for file operations. How exactly is this implemented?Select Interface:Int select (int nfds, fd_set * readset, fd_set * writeset,Fd_set * effectset, struct timeval * timeout );Where:NfdsNumb

Poll for linux drivers and poll for linux driversPOLL operations 1. POLL execution process: Poll is a system call. Its kernel entry function is sys_poll. sys_poll calls do_sys_poll directly without any processing. The execution process of do_sys_poll can be divided into three parts: 1. Copy the input pollfd array to th

Linux Kernel 3.11 socket busy poll mechanism to avoid sleep switching, 3.11 pollThe network protocol stack of Linux is very independent. The upstream and downstream interfaces are connected to the user State and devices respectively. They can also be seen as North and South interfaces... the north direction uses the socket interface and the south direction uses the qdisc interface (you can think of it as the upper-layer netdev queue. For the receiving

/* Echo server implemented by poll. author: thinkmay */# include

With the full support of the 2.6 kernel to epoll, many articles and sample code on the network provide a message that using Epoll instead of the traditional poll can bring a performance boost to Web service applications. But most of the reasons for performance improvements are less explained here, I'll try to analyze how poll and epoll work in the kernel (2.6.21.1) code, and then compare the results with so

The following article in this period of time to study the implementation of the kernel of Select/poll/epoll experience: Select,poll,epoll are multiplexing IO functions, simply in a thread, you can handle multiple file descriptors at the same time read and write. The implementation of the Select/poll is similar, Epoll is extended from Select/

wait_entry;wait_entry.task= Current_task;wait_entry.callback = func1;if (something_not_ Ready); Then # into the clogging path add_entry_to_list (Wait_entry, sleep_list); go on: schedule (); if (Something_not_ready); Then goto go_on; endif del_entry_from_list (Wait_entry, sleep_list); EndIf ...Wake-up mechanismSomething_ready;for_each (sleep_list) as Wait_entry; Do wait_entry.callback (...); if (wait_entry.exclusion); Then break ; EndifdoneWe just need

SelectThe essence is to use 32-bit 32-bit integer, that is, 32*32 = 1024, And the FD value is 1-1024. When the FD value exceeds the 1024 limit, you must modify the fd_setsize. In this case, you can identify the FD in the 32 * max value range. Select is not suitable for scenarios where a single process is multi-threaded and each thread processes multiple FD operations. 1. All threads scan from 1-32 * max, and each thread processes a FD value, which is a waste. 2.1024 upper limit. For a proc

;wait_entry.callback = func1;if (something_not_Ready);Then # Enter the blocking path Add_entry_to_list (Wait_entry, sleep_list); go On:schedule ();if (Something_not_ready);Then Goto go_on; endif del_entry_from_list (Wait_entry, sleep_list); EndIf ...Wake-up mechanismSomething_ready;for_each (sleep_list) as Wait_entry;Do Wait_entry.callback (...);if (wait_entry.exclusion);Then break; EndifdoneWe only need to seriously pay attention to this callback mechanism, it can do things really more than Sel

1. Basic knowledge　　The poll mechanism is similar to select in that there is no significant difference in nature with Select, that managing multiple descriptors is also polling and processing according to the state of the descriptor, but poll has no limit on the maximum number of file descriptors. The disadvantage of poll and select is that an array containing a

Transferred from: http://www.cnblogs.com/lanyuliuyun/p/5011526.htmlRecently a simple look at a handful of linux-3.10.25 kernel in Select/poll/epoll this several IO event detection API implementation. Make some records here.The basic principle is the same, the process is as follows Call the FD corresponding struct File.f_op->poll () method (if available) to try to check if each FD that provides the

I recently read the implementation of the Linux poll mechanism and the analysis documents of instructor Wei, which are summarized as follows: Int poll (struct pollfd * FDS, nfds_t NFDs, int timeout ); In general, the poll mechanism will determine whether the files in FDS are readable. If the files are readable, the system will return immediately. The returned val

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Recently, I have seen a simple implementation of the IO event detection API Select/poll/epoll in Linux linux-3.10.25 kernel. Make some records here.The basic principle is the same, the process is as follows Call the FD corresponding struct File.f_op->poll () method (if available) to try to check if each FD that provides the IO to be detected has an IO event ready If an IO event is already ready

Poll Mechanism analysisVedon 2009.12.10All system calls, based on the "Sys_" prefix in front of its name, are the corresponding functions in the kernel. For example, the system calls open, read, write, poll, and the corresponding kernel functions are: Sys_open, Sys_read, Sys_write, Sys_poll.First, the kernel framework:For system calls poll or select, their corres