[Tomcat source code analysis] build Apache Tomcat source code debugging environment in Eclipse

Many articles on the Internet are recommended to download and compile with Ant, but in local practice, they fail repeatedly and cannot be downloaded. Later, refer to https://blog.csdn.net/xiongyouqiang/article/details/78941077 to finally build the debugging environment. The following article almost completely copies the above website, but sli ...

Posted on Thu, 12 Dec 2019 14:50:22 -0500 by skurai

Use mysql to store metadata for hive installation and configuration

Install and configure mysql Install and configure hive One mysql installation configuration I. Mysql installation 1. Install mysql command: Yum install MySQL server - y (- y parameter is the default yes for all places where you need to enter yes) 2. Open mysql service: service mysqld start 3. Set the mysql service to start a ...

Posted on Thu, 12 Dec 2019 10:31:06 -0500 by Rich464

Spring boot project to track log links

1. Background Depending on the original log4j2 configuration, it is difficult to find all logs of an API call from the miscellaneous logs of a service. In this paper, we print a unique traceId in the log to track every call. 2. Key ideas 2.1.MDC The log tracking target is at each request level, that is, each request of the same interface ...

Posted on Thu, 12 Dec 2019 07:56:41 -0500 by daok

In order to better meet the needs of historical data storage and retrieval, programmers often choose this kind of God operation!

The original is published in the WeChat public address: Tencent cloud storage (attention has surprises) Usage scenarios ElasticSearch is a very popular open-source document index engine, which is favored by large and small companies for log retrieval, analysis and query. However, the data of ElasticSearch relies on the local disk for storage ...

Posted on Thu, 12 Dec 2019 02:36:33 -0500 by frANZi

SpringCloud Distributed Micro Services Cloud Architecture Part 1: Registration and Discovery of Services Eureka(Finchley Edition)

1. Introduction to spring cloudGiven the popularity of the simplest Spring Cloud Tutorial in history, I intentionally upgraded the next version to support version 2.0.3.RELEASE for Spring Boot and Finchley.RELEASE for Spring Cloud. The official documentation for the Finchley version is as followshttp://cloud.spring.io/spring-cloud-static/Finch ...

Posted on Wed, 11 Dec 2019 16:00:22 -0500 by ts2000abc

XIV. Data format conversion of spark log file summarized by Spark SQL

Step 1. Data source Find the log data source of spark. In the directory / root / spark / spark-2.0.2-bin-hadoop 2.7/logs: By reading the file, count the number of data: val masterLog = sc.textFile("file:///root/spark/spark-2.0.2-bin-hadoop2.7/logs/spark-root-org.apache.spark.deploy.master.Master-1-hadoop000.out") val workLog = ...

Posted on Wed, 11 Dec 2019 14:33:55 -0500 by latvaustin

Talk about rocketmq's sendOrderly

order This paper mainly studies the sendOrderly of rocketmq sendOrderly rocketmq-spring-boot/2.0.4/rocketmq-spring-boot-2.0.4-sources.jar!/org/apache/rocketmq/spring/core/RocketMQTemplate.java public class RocketMQTemplate extends AbstractMessageSendingTemplate<String> implements InitializingBean, DisposableBean { //...... public S ...

Posted on Wed, 11 Dec 2019 11:48:30 -0500 by timbuckthree

Export data to Excel using POI

Export data to Excel using POI I. overview Apache POI - Java API for Microsoft documentation Download: http://poi.apache.org/index.html Guide: https://poi.apache.org/spreadsheet/quick-guide.html maven Download: <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId&gt ...

Posted on Tue, 10 Dec 2019 21:02:34 -0500 by freakus_maximus

Appending files to zip package in Java

There is a requirement to add a description file to a zip package downloaded from an interface. After searching, I didn't find a way to add files directly to zip. The final solution is to decompress and then compress. The specific process is as follows: 1. A zip file compression and decompression tool class The compression and decompression ...

Posted on Tue, 10 Dec 2019 17:34:23 -0500 by hame22

Control log4j at different log levels in multiple environments in Spring Boot

I. question raising Only through log4j.properties to control the log level, it is not very convenient for the environment requiring multi environment deployment. Maybe we need to use the DEBUG level for most modules in the development environment, the DEBUG level for a small part in the test environment, and the INFO level for ...

Posted on Tue, 10 Dec 2019 15:51:31 -0500 by 0riole