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Configure the programming environment on Hadoop and test sample run Pre-preparation: Hadoop runs successfully"Hadoop" Installation of the Sixth Bullet from Zero - Brief Bookhttp://www.jianshu.com/p/96ed8b7886d2 Install the Linux version of eclipseeclipse-jee-mars-2-linux-gtk-x86_64.tar.gzUse tar command to decompress under Linux, ...

Background: After the completion of the new function development test, we are ready to launch. When the third machine is released, the monitoring shows that CPU of one machine suddenly soars to 300%, the number of active threads of Dubbo directly soars to 1000+, so we have to stop publishing, immediately roll back the problem machine, and retur ...

In our projects, we usually use slf4j to log in this way:org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(Test.class);Start with this log Logger creation to see the source code:org.slf4j.LoggerFactory.getLogger(String name){ ILoggerFactory iLoggerFactory = getILoggerFactory(); //1 places return iLoggerFactory.getLogger(name); ...

log4j collation in production environment There are many improvements in the log of the company's java underlying code. This article mainly records the difficulties encountered in the process of improvement and records them in order to avoid forgetting (here I use log4j.propertes, not log4j.xml). How to configure log paths in non-web projec ...

Link to the original text: http://www.dubby.cn/detail.html?id=9024 This brief introduction This article is intended for beginners of ZooKeeper, introducing simple installation, configuration, and commands to try to run ZooKeeper. Also mentioned are some slightly responsible installations - replicated deployments, log optimization. Of course, ...

spark version 1.6.0, Scala version 2.12, jdk version 1.8. spark has been used recently and is recorded here. One master and three workers, together with Hadoop-2.7.7 cluster, namdenode on master and two datanode s on worker 1 and worker 2.     List-1 192.168.33.30 worker1 master 192.168.33.31 worker2 192.168.33.32 worker3 Modify the h ...

Common application scenarios for form duplicate submission1. When the network is delayed, the user clicks the submit button several times, which leads to the delay.2. After submitting the form, the user clicks the refresh button to cause the form to be submitted repeatedly.3. After submitting the user's form, click the browser Back button to re ...

Address of this article http://blog.csdn.net/makefriend7/article/details/60323717 First put the official address https://www.elastic.co/guide/en/elasticsearch/plugins/5.2/index.html 1. Introduction to Plug-ins Plug-in, as you know by name, is to insert something on ES to enhance ES's ability. Here's a brief introduction to th ...

This paper is based on: Spring Boot 2.1.3, which supports all versions of Spring Boot 2.x theoretically. As a programmed ape, positioning is our daily work, and log is a very important basis for positioning. When locating problems in traditional ways, the following steps are often taken: Set the log level low, such as DEBUG; Restart the appl ...

Article directory demand Trial process pom.xml file Configuration of log4j2 in web.xml log4j2 file path Test whether the log4j2.xml modification takes effect during project operation Solve the problem Successful retest demand Want to use Log4j2's dynamic loading configuration file feature, build a spring MVC project ca ...