Programmer Think

Links to the original text: http://ju.outofmemory.cn/entry/356304 mybatis application program, because it is semi-automated sql, a large number of SQL is configurated in XML files, and in the process of developing programs, it is usually ...

Said ahead Message Pull Processor Source code analysis Enter this method and find the mapping file according to offset, as described above at org. apache. rocketmq. store. MappedFileQueue # find MappedFileByOffset (long, boolean). Return to this method and find the next mapping file based on offset, org ...

morgan // Introducing morgan package var morgan = require('morgan') Usage method morgan(format,options) The format: (string/function) printing mode can be the name of the predefined printing method, or the formatted string, or the callback method of the formatted entry. Use predefined printing ...

Ribbon Load Balancing Ribbon is a load balancer released by Netflix. Spring Cloud Ribbon is a load balancing solution. It is based on Netflix Ribbon and is a load balancing client for controlling HTTP requests. After registering Ribbon in the registry, Ribbon can automatically help service consumers c ...

Actual operations: 1. Start nameser and broker 2. Adding packages <properties> <!--rocketmq Edition--> <rocketmq.version>4.1.0-incubating</rocketmq.version> </properties> <!--Add to RocketMQ package --> <dependency> ...

#set directive # The set instruction is used to assign values to a variable or object. Format: # set($var = value) LHS is a variable. Do not use special characters such as English periods. The test found that # set ($user. name ='zhangsan') and # set (${age} = 18) failed in assignment. RHS can be variables, string literals, numeric literals ...

I've learned one template rendering technology before, Thymleaf. Today I'm going to talk about another template rendering technology, Velocity! Knowledge Point Preview: Encapsulating various properties of Velocity with Properties Velocity Engine instantiates template engine objects based on Prope ...

Some related tests were carried out for spark: wordcount test for spark, feasible test for spark streaming, and test for Kafka message production. 6.1 spark word count test The spark test case is used to test whether spark can be operated or not. import org.apache.spark.{SparkConf, SparkContext} object ...

Copy the company's project code from colleagues and try to run it. Because the project's architecture is springmvc, I mainly look at the file springmvc.xml, and see that the configuration file needs to connect to the local redis, so I learn by the way: 1. Download: github downloads files is really d ...

Note: This method is for quick experience or small data volume, not suitable for large data volume production environment. Environmental preparation: Centos7 Nutch2.2.1 JAVA1.8 ant1.9.14 HBase 0.90.4 (stand-alone version) solr7.7 Relevant download address: Links: https://pan.baidu.com/s/1Tut2CcKoJ9-G-HBq8zexMQ Extraction code: v75v Start inst ...