Reader's Letter|If you have too many Region s in your HBase cluster, take a look at this problem, which you may encounter

Preface: Reader's Letter is a question and answer column opened by the old HBase store, which aims to solve HBase-related problems frequently encountered in the work for more small partners.The store will try its best to help you solve these problems or give you a help. The store hopes this will be a small platform to help each other.If you hav ...

Posted by chatmaster on Mon, 06 Apr 2020 20:35:23 -0700

Do you know four scenarios for Http requests and responses in web projects

[Four cases]: HttpRequest,HttpResponse,HttpServletRequest,HttpServletResponse[What is HTTP?]HyperText Transfer Protocol (HTTP) is a protocol designed to allow clients and servers to communicate smoothly.HTTP works as a request-response protocol between the client and the server.[Two commonly used methods of Http]get - get data from the specifi ...

Posted by only one on Mon, 06 Apr 2020 10:09:36 -0700

The realization principle of window function in spark and hive

Window function is often used in work and often asked in interview. Do you know the implementation principle behind it? Starting from the problems encountered in a business, this paper discusses the data flow principle of window function in hsql, and gives a solution to this problem at the end of the article. ​   1, Business background Fi ...

Posted by moiseszaragoza on Mon, 06 Apr 2020 04:05:56 -0700

concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 3

Today's project, because of the use of spring asynchronous concurrent execution, this error occurred. And occasionally, especially when the project is just started, such problems may occur java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 3 at java.util.concurrent.FutureTask.report(FutureTask.java:122) ...

Posted by blacklotus on Sun, 05 Apr 2020 19:58:19 -0700

Gradle this article is enough for 08 wrapper

Use of wrapper Gradle Wrapper is the recommended usage of gradle. This article will illustrate how to use it with specific examples. Gradle Wrapper The Gradle Wrapper is actually a script, which can be used to download and use the specified version of gradle. It can be downloaded before use as required, effectively avoiding environment consiste ...

Posted by jfontein on Sun, 05 Apr 2020 18:29:11 -0700

Talk about canal's ApplicationConfigMonitor

order This article mainly studies canal's ApplicationConfigMonitor ApplicationConfigMonitor canal-1.1.4/client-adapter/launcher/src/main/java/com/alibaba/otter/canal/adapter/launcher/monitor/ApplicationConfigMonitor.java @Component public class ApplicationConfigMonitor { private static final Logger logger = LoggerFactory.getLogger(Applic ...

Posted by elkidogz on Sat, 04 Apr 2020 22:44:58 -0700

Create Maven private warehouse with Nexus

Go to http://www.sonatype.org/nexus/go/ Download nexus-2.14.5-02-bundle.tar.gz Create the nexus directory in the server and download the Nexus (upload it to the oss first and then download it in the form of wget) [root@iZm5e0c5bxd15k4yfdiirsZ opt]# mkdir nexus [root@iZm5e0c5bxd15k4yfdiirsZ opt]# ls apache-tomcat-8.0.30 jdk1.8.0_11 nexus r ...

Posted by rupertbj on Sat, 04 Apr 2020 09:42:49 -0700

(6) Build dubbo distributed platform maven build config configuration project

In the previous article, we introduced build dubbo distributed platform maven build ant parent project. The framework uses maven to build. According to our plan, we need to build all subprojects. Today, we focus on the construction process of ant config configuration file project. Introduction: The purpose of independent ant config project is ...

Posted by adaykin on Fri, 03 Apr 2020 21:35:27 -0700

Mybatis: how to use mybatis

1, Create a project (this article takes the project that Idea builds based on Maven as an example) New->Project                   I choose my local Maven and configuration here       Finally, click Finish       2, Add dependency package in configuration file Add package dependency of Mybatis, JDBC driver and log4j log management ...

Posted by piyushsharmajec on Fri, 03 Apr 2020 18:46:29 -0700

java RSA asymmetric encryption decryption (concise)

Last article: Generation of RSA asymmetric encryption certificate (concise and clear) See my last article for the generation of Java asymmetric encryption certificate. The lower part is mainly the Java decryption part. Use the certificate pkcs8 ﹣ private ﹣ key.der (that is: Generation of RSA asymmetric encryption cer ...

Posted by dwu on Fri, 03 Apr 2020 13:45:11 -0700