concurrency - Java concurrently processes a large amount of data in a table, how to set checkpoints so that they can be used for failure recovery instead of repeatedly processing the processed data?

Java concurrently processes a large amount of data in a table. How to set checkpoints for failure recovery instead of repeatedly processing the processed data? For example, if the system crashes during processing, and before kill -9 is used to force the kill, set a checkpoint and resume processing f...

滿天的星座 2017-05-17 10:08:26 0  1  745

How do PHP and MySQL handle concurrent requests?

I must be missing something about how PHP/Symfony handles concurrent requests, or perhaps how potentially concurrent queries on the database are handled... This code seems to be doing the impossible - it does it randomly (about once a month ) creates a copy of the new entity at the bottom. My conclu...

P粉037215587 2023-09-05 12:17:19 0  1  635

Concurrent queue processing system based on Swoole and Redis

Since PHP does not support multi-threading, as a complete system, many operations need to be completed asynchronously. In order to complete these asynchronous operations, we built a Redis queue task system. As we all know, a message queue processing system is mainly divided into two parts: consumers...

PHP中高级教程分享 2018-11-14 11:18:20 1  2  1558

nginx - Are the number of requests per second and concurrency the same concept?

Windows tested the server using apache's ab -c 100 -n 1000 http://www.xxxxx.com and found that the number of requests processed per second was only 20, and the rest were waiting. Doesn't it mean that the default concurrency of nginx is very high? Or the number of requests processed per second and co...

某草草 2017-05-16 17:22:51 0  4  1449

nginx - apaceh concurrency issues

Requirements: Apache, as a web server, receives REST requests. The peak concurrent request volume is 500qps, the average is 50qps, and the time performance requirement is within 50ms. The current problem: The time from request initiation to program execution is about 20ms: the average program proces...

PHP中文网 2017-05-16 16:57:25 0  1  745

Does local win7 TP5 use Redis to implement concurrent processing?

I am a newbie and I am making a purchase function. When there is only one item left but two people purchase it at the same time, how should I handle this situation? I only learned about Redis a few hours ago using the TP5 framework. I really don’t know how to use TP5. Is there any way to deal with t...

葫芦娃平衡盘 2018-03-14 18:34:12 0  4  1584

python - How to deal with the concurrency problem of multiple requests being called at the same time during auction bidding in an auction system made with java? ?

The auction system has a function of bidding on prices. The current situation is that multiple requests are bidding at the same time. How to deal with this concurrency problem in the background, how to roughly analyze the business logic of who succeeds and who fails in this auction, and how to deal ...

阿神 2017-05-16 13:27:48 0  1  975

How Weex handles HTTPS network requests and how Android handles it

How does Weex handle Https network requests and Android handles them? Generally, Http can be accessed successfully.

代言 2017-06-17 09:16:08 0  1  972

Set up Apache2 to handle .html files the way php 8.0 does

I have setup php/apache according to this linode guide: https://www.linode.com/docs/guides/install-php-8-for-apache-and-nginx-on-ubuntu/ This seems to work, I have An apache server that can serve files and process .php files. However, I'm taking the time to figure out how to tell apache to use .php ...

P粉670838735 2024-01-16 11:25:21 0  1  505

redis - How does PHP prevent multiple processes from operating the same resource at the same time?

How does PHP prevent multiple processes from operating the same resource at the same time? For example: flash sale products in the mall? Stock lock? Avoid oversold inventory? What is the principle?

滿天的星座 2017-05-16 13:18:57 0  4  808

javascript - How does axios handle errors of the same type uniformly?

{Code...} My question is: After I handle the validation error in the interceptor, how can I prevent the separate business processing in the page from executing?

巴扎黑 2017-05-19 10:10:54 0  1  611

Create PHP parallel processing from getResult principle request

I want to do some kind of multi-threading in a PHP8/Symfony6 environment, the way it works is as follows: I am making a principle request that serves about a million rows and I want to create multiple parallel processes to process the rows at the same time. My request is made via getResult() which s...

P粉649990163 2023-09-14 19:30:46 0  1  631

Is there any elegant way to handle refreshed/loaded data of the same interface?

Please tell me about your request for list data, pull-down refresh and pull-up loading requests in the same interface. So what is a more appropriate way to process the data when getting the request result? My current approach is to pass the data into the same function, and then judge this request in...

PHP中文网 2017-05-16 13:31:18 0  2  626

python - dateutil.parser handles incomplete time strings

The parse function is powerful and convenient, and it is easy to handle time analysis in various string forms. However, when encountering an incomplete time format, such as '8-9 12:00', it can also be automatically parsed into 2017-8-9 12: 00, the default current year is used to complete the missing...

过去多啦不再A梦 2017-06-12 09:27:04 0  2  874

javascript - How terminal management identifies different devices

It is mainly implemented through php or js. How to identify different devices in terminal management. For example, if two mobile phones are both iPhone 7 at the same time, how to identify their differences?

曾经蜡笔没有小新 2017-05-16 13:01:14 0  1  457

nginx - How to understand the asynchronous non-blocking high-performance web server advertised by openresty?

I understand asynchronous and synchronous, whether it is blocking or not, but I just don’t understand how openresty implements asynchronous non-blocking IO and achieves high concurrency processing capabilities? I usually write Lua interfaces, but I can see considerable QPS when doing stress tests, b...

仅有的幸福 2017-05-16 17:10:59 0  1  859

php - delete...in() delete statement preprocessing and non-preprocessing result are different

When using delete from XXX where id in (XXX) for batch deletion, when using PDO preprocessing, only one record can be deleted at a time. The code is as follows: {code...} It can be used without preprocessing. Normal operation, delete multiple records in batches, the code is as follows: {code...}...

曾经蜡笔没有小新 2017-05-24 11:32:31 0  1  937

node.js - How does nodejs cache requests from mobile apps, process them in batches, and return processing results to the app at the same time?

The current situation is: the Android app sends a registration request to the server built with nodejs, and nodejs is responsible for calling the relevant API to register with Huanxin. However, Huanxin has limited flow for the API, so it wants to do batch processing, such as calling batch registrati...

巴扎黑 2017-05-16 13:45:28 0  1  732

angular.js - There are both angular and jquery plugins to handle keydown events

I downloaded a jq plug-in online, and the input box is bound to the click event, but the angular script I wrote myself also uses ng-keydown on the same input box. . . I thought Angular's keydown processing function would be executed, but it didn't work. . . But I can't put the plug-in's click event ...

漂亮男人 2017-05-15 17:08:07 0  2  675

javascript - js Is there any elegant way to communicate between two tabs that are open at the same time?

Here is an example: I opened two pages a and b at the same time. I focused on a and performed some operations, letting the js on page a process my operations and send the data to page b next to it. At this time, page b can receive these data and give feedback without refreshing or going through the ...

黄舟 2017-05-16 13:39:46 0  4  731