CopyOnWriteArrayList special points, compare ArrayList

CopyOnWriteArrayList special points, compare ArrayList ArrayList can use the iterator's remove method to delete elements, CopyOnWriteArrayList can't use the iterator's remove method to delete elements, but can only use the collection's remove method to delete elements public class Demo15 { publi ...

Posted on Thu, 25 Jun 2020 07:03:39 -0400 by [L3]sPARTAN

26 - how does the production environment exclude and optimize the JVM?

I believe you have a general impression on the theory and practice of the JVM through the previous several lessons. This lesson will focus on the troubleshooting and optimization of the JVM, so as to have a complete understanding of the knowledge points of the JVM, so that it can be better applied to th ...

Posted on Tue, 23 Jun 2020 04:31:08 -0400 by Jewbilee

. NET Core Options

ASP.NET The core introduces the Options mode, which uses classes to represent related setting groups. To put it simply, a strongly typed class is used to express configuration items, which brings many benefits. The dependency injection of the system is utilized, and the configuration system can also be utilized. It allows us to directly use a ...

Posted on Sun, 21 Jun 2020 04:55:16 -0400 by urb

A brief analysis of the starting process of Deno source code

start Here we start from the start of Deno to analyze: how the TS code is loaded and running, what has been done in each step; hope to give you some inspiration. Deno start Go straight to cli/main.rs Main method of: pub fn main() { ... log::set_logger(&LOGGER).unwrap(); //Set log level let args: Vec<String> = env::args().collec ...

Posted on Thu, 18 Jun 2020 04:14:48 -0400 by FirePhoenix

EmguCv learning_ Camera, video reading_ write in

Camera, video reading_ write in Open video VideoCapture class The new VideoCapture class in opencv2.x and above provides an interface to capture video from a camera or video file Four constructor methods of VideoCapture class public VideoCapture(); public VideoCapture(CaptureType capture Type); ...

Posted on Tue, 16 Jun 2020 00:44:02 -0400 by sharugan

State change of PV and PVC in K8s

We should be familiar with several states of PV and PVC, but there may be some questions in the use process, such as why PVC has become Lost state, how the newly created PVC can bind the previous PV, and can I restore the previous PV? Here we will explain several state changes in PV and PVC again. In d ...

Posted on Mon, 15 Jun 2020 00:34:40 -0400 by waseembari1985

Building analysis data lake with Apache Spark and Apache Hudi

Welcome to WeChat official account: ApacheHudi 1. Introduction Most modern data lakes are built on some kind of distributed file system (DFS), such as HDFS or cloud based storage, such as AWS S3. One of the basic principles to follow is the "write once read many" access model for files. This ...

Posted on Sun, 14 Jun 2020 22:39:40 -0400 by tozanni

Some useful SQL statements in MySQL

When writing SQL, we often flexibly use some skills of SQL statement writing, which can greatly simplify the program logic. Reduce the number of interaction between the program and the database, which is conducive to the high availability of the database. At the same time, it can also appear that your SQL is very good, so that colleagues can se ...

Posted on Sun, 14 Jun 2020 04:44:28 -0400 by Hagbard

MySQL clone plugin (for 8.0.17 +)

MySQL Clone Plugin(8.0.17 +) 1, What is a clone plug-in? Allow copying data from a local or remote MySQL server instance It can take a physical snapshot of InnoDB's schemas, tables, tablespaces, and data dictionary metadata Supports replication, such as for MGR 2, Using the clone plug-in 2.1 installing the clone plug-in # Mode 1: ...

Posted on Fri, 12 Jun 2020 02:23:59 -0400 by douga

EMQ X - EmqxBroker CoAP protocol data access test and questions

Don't say anything. Let's take a picture first. Wait... There's also a snapshot;   Let's see how we use CoAP protocol to connect EMQX; 1, Start the coap plug-in and use the code test; 1. Open the emqx COAP plug-in; you can directly click the enable button on the dashboard; (recommended by Win e ...

Posted on Wed, 10 Jun 2020 02:26:39 -0400 by olm475