what is the difference between the blocking message queue implemented with jedis s BRPOP and BLPOP and the publish subscribe system implemented using jedis s subscribe and publish , and how to choose? ...
< H1 > problem description < H1 > I use the hash table to represent the people on the seat (key represents the seat position, value is the specific uid), and then use hsetnx to process the concurrent seat. but there is a problem that, after the seat ...
MQTT (: Message Queuing Telemetry Transport (message queuing Telemetry Transport Protocol) message queuing (MQ): is used for asynchronous processing, application decoupling, traffic trimming, and so on. so I have the following questions: 1:mqtt "me...
there are currently thousands of messages stored in mq. Integrated into the project, after each startup, only 2 pieces of consume can be dropped, and it will not be consumed automatically. But to bring out the consumer alone and become a pure to the pro...
when using the Rocketmq queue service, the server sees that the log has been started successfully, but the above error is thrown when the code called by the official client is executed. I use version 4.3.0 of Rocketmq. The following is the code called b...
use PHP multiprocess to listen on multiple rabbitmq queues (php-amqplib used) 2 30 2 0sleep 1 1sleep 2 2 it seems that you have to wait for the main process to generate three child processes and let three child processes execute at the same ...
I want to link to rabbitmq in workman! When a message is received, it is forwarded to the websocket client I don t know whether it will work or not! ...
I set up a kafka service in the virtual machine of my computer and use the Java client to access it locally. Now if the service on the virtual machine is turned off by me, my local code will not be able to push messages to kafka and will report a timeou...
would you like to know if rabbitmq supports distributed transaction messages? rocketmq4.3 begins to support distributed transaction messages. what is the general mechanism if rabbitmq does not support transaction messages? ...
this article https: blog.csdn.net chunlon.: failed to send a message to the message middleware. Does the sender not know that the message middleware really did not receive the message? Or has the message been received, but failed to return response?...
compared with mq, redis subscription publication has many disadvantages, such as no guarantee that messages must be reached. however, redis subscription publications can certainly have their own advantages. For example, redis publish subscriptions can ...
because it seems that messages will be consumed according to priority only when consumers have unack. I feel that message priority is a very chicken-rib function. I don t know where it can be applied? ...
when using php-amqplib to operate rabbitmq, it is found that basic_qos has three parameters prefetch_size prefetch_count global global and prefetch_count roughly understand the meaning of these two parameters but the meaning of the first parameter,...
recently, I was learning to use create-react-app scaffolding in antd,. According to the configuration of less, on the Internet, but after start, ant reported an error. webpack.configi.dev configuration Code { test: .(css|less)$ , ...
the following code opens the yahoo.com home page and outputs all the text in the p tag import urllib.request import lxml.html chaper_url="https: www.yahoo.com " headers = { User-Agent : Mozilla 5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko 2...
modify the maximum number of files on the server add vi etc scurity limits.conf * soft nofile 65536 * hard nofile 65536 etc sysctl.conf file has been added fs.file-max=65535 enter a command sysctl -p exit restart xftp link and ...
platform: windows10 after I use the start function of QProcess to execute the local (current directory) python file, I can t get standard output from readAllStandardOutput. Code of python file: print "hello,world " Qt Code: -sharpinclude <QP...
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