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Connection oriented concurrent server def main(): # 1. Create socket socket tcp_server = socket(AF_INET, SOCK_STREAM) # 2. Bind IP address and port tcp_server.bind(("", 8888)) # 3. Change the active mode to the passive mode, and only receive and not send data tcp_server.listen(5) while True: # 4. ...

order This paper mainly studies the pullFromWhichNodeTable of rocketmq pullFromWhichNodeTable rocketmq-all-4.6.0-source-release/client/src/main/java/org/apache/rocketmq/client/impl/consumer/PullAPIWrapper.java public class PullAPIWrapper { private final InternalLogger log = ClientLogger.getLog(); private final MQClientInstance mQClientF ...

Preface: Basic regular expression Extended regular expression How to use sed tool How to use awk tools One: regular expression I have learned the basic usage of Shell script before, and I can edit Shell script with conditional judgment, loop and other statements. Next, we will introduce a very important concept - regular expression (RE). Reg ...

original text Today, the production environment found that some containers stopped responding, but the containers did not die. Docker exec - it < container name > / bin / bash can also be used normally. Use jstack < PID > inside the container to find that the Console Appender of log4j2 is always running: "AsyncAppender-asyncConsole" ...

When the project uses request.getInputStream to read the request in the way of stream, but in the actual project, some interceptors are usually used to do some verification. It is found that the request can only be read once, and it can't be used in the Controller. For example, when the front-end request is submitted in json mode, the back-end ...

Summary Alicloud Streaming Data processing platform DataHub is a Streaming Data processing platform. It provides the publishing, subscription and distribution functions of Streaming Data, so that you can easily build analysis and application based on Streaming Data. At present, the official SDK of Java and Python is provided, and users can easi ...

Environmental Science CentOS 6.10 JDK1.8 192.168.1.120 The software installation package is uniformly placed in / usr/local/src/ The software installation directory is uniformly placed in / usr/local/ 1. Install JDK and configure environment variables (omitted) 2. Download ActiveMQ apache-activemq-5.11.1-bin.tar.gz you can f ...

Import the required coordinates. Note that it conflicts with the lower version of HTTP client <dependency> <groupId>org.apache.solr</groupId> <artifactId>solr-solrj</artifactId> <version>7.3.1</version> </dependency> //Connect to server HttpSolrClient solrClient = new HttpSolrClie ...

1. Host planning Host name IP address operating system Deployment Software Operation process Remarks mini01 172.16.1.11 [intranet] 10.0.0.11 [Internet] CentOS 7.5 Jdk-8, zookeeper-3.4.5, Hadoop 2.7.6, hbase-2.0.2, Kafka ou 2.11-2.0.0, spark-2.4.0-hadoop 2.7 [main] QuorumPeerMain,   mini02 172.16.1.12 [intranet] ...

According to the requirements of leaders, two kinds of pressure measurement modes are distinguished: fixed number of pressure measurement and fixed time pressure measurement. Before that, the fixed number of times has always been used, so the second version of this release has stripped the fixed number of times mode and increased the fixed time ...