Database|Binlog troubleshooting: drainer strikes periodically

Table of Contents 1. Background 2. Fault phenomenon 3. Analysis process 4. Solution 5. Thinking 6. Summary 1. Background Recently, users have reported that the drainer of our production environment TiDB cluster frequently fails. Failures manifest as service crashes and failure to start, or data being lost during operation, which brings great trouble to our […]

Rotation animation, requestAnimationFrame periodic rendering

The development of online games, product displays, and indoor roaming based on WebGL technology often involves animation. 1. Periodic rendering In order to achieve periodic rendering, you can use a method setInterval() of the browser global object window object. You can call this method window.setInterval(), you can also call setInterval() directly in function form. setInterval() […]

Istio Practical Practice (12)-Istio Extends the Validity Period of Self-Issued Certificates

For historical reasons, Istio’s self-signed certificates are only valid for one year. If you choose to use Istio’s self-signed certificates, you’ll need to plan to replace your root certificates before they expire. Expired root certificates can cause unexpected cluster-wide outages. We believe that replacing root certificates and keys every year is a security best practice, […]

springboot+mybatis3.5.2 dynamically queries the statistical information of a certain field within a certain period of time (line chart)

need: Dynamically query the statistical line chart information of a certain statistical field within a period of time controller layer @ApiOperation(value = “getStatisticDetail”, notes = “Statistical Line Chart”) @GetMapping(“/detail”) @ResponseStatus(HttpStatus.OK) @AccessLogAnnotation(ignoreRequestArgs = “loginUser”) @ApiImplicitParams({ @ApiImplicitParam(name = “startTime”, value = “StartTime”, dataTypeClass = String.class), @ApiImplicitParam(name = “endTime”, value = “End Time”, dataTypeClass = String.class), @ApiImplicitParam(name = […]

Use the HAL library to implement periodic flashing and interrupt mode programming of the running water lamp.

Use the HAL library to implement periodic flashing and interrupt mode programming of the running water lamp. Building development environment 1. Install jdk (you don’t need this step if you have a java environment) jdk official website download link: https://www.oracle.com/java/technologies/javase-downloads.html 2. Install STM32CubeMX download link: https://www.st.com/en/development-tools/stm32cubemx.html Installation process Run SetupSTM32CubeMX-4.27.0.exe as administrator and click Next […]

Image processing: Others – Periodic noise removal filter OpenCV v4.8.0

Previous tutorial: Anisotropic image segmentation using gradient structure tensors Original author Karpushin Vladislav Compatibility OpenCV >= 3.0 Goals In this tutorial you will learn How to remove periodic noise in Fourier domain Theory Comments This tutorial is based on the book [98]. The images on this page are real world images. Periodic noise produces spikes […]

Javascript implements query condition switching of year, quarter, month and time period

Effect: Page code <div align=”left”> <input name=”stage” type=”radio” value=”year” onClick=”changeDisplay(this)”> \t\t\t Year <input name=”stage” type=”radio” value=”stage” onClick=”changeDisplay(this)”> season <input name=”stage” type=”radio” value=”month” onClick=”changeDisplay(this)”> \t\t moon <input name=”stage” type=”radio” value=”time” onClick=”changeDisplay(this)” checked> \t\t period </div></th> <td width=”439″ id=”tdObj”> <input name=”startDate” type=”text” class=”Wdate” id=”startDate” onFocus=”WdatePicker({dateFmt:’yyyy-MM-dd’,skin :’whyGreen’})” /> to <input name=”endDate” type=”text” class=”Wdate” id=”endDate” onFocus=”WdatePicker({ dateFmt:’yyyy-MM-dd’,skin:’whyGreen’})” /> </td> […]

2251. Number of flowers during flowering period

Source: LeetCode Description: Give you a two-dimensional integer array flowers whose subscript starts from 0, where flowers[i] = [starti, endi] represents the i The flowering period of a flower is from starti to endi (both inclusive). At the same time, you are given an integer array people with the index starting from 0 and size […]