Apache Kafka Study Notes

quick get start install Docker installation single Kafka docker pull wurstmeister/zookeeper docker pull wurstmeister/kafka docker run -d --name zookeeper -p 2181:2181 wurstmeister/zookeeper docker run -d --name kafka -p 9092:9092 -e KAFKA_BROKER_ID=0 -e KAFKA_ZOOKEEPER_CONNECT=Host computer IP:2181 -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://127 ...

Posted by ghost007 on Fri, 24 Apr 2020 00:00:49 -0700

Recommendation Engine for SparkML (2) - Evaluation of Recommendation Model

The content and code for this article follow Last article To write, we recommend that you take a look at Ha~.We wrote the implementation of the movie recommendation in the last article, but is the recommendation reasonable? This requires us to evaluate the model.For the recommended models, the models are evaluated based on the mean square devia ...

Posted by chiprivers on Thu, 23 Apr 2020 10:52:57 -0700

The implementation of Servlet file upload

1. Three common file upload components: Apache commons upload, Orialiy – COS – 2008(); smart upload2. Use commons upload to develop file upload function1) . download the jar package and dependent package of Commons upload and add them to the project project2) . modify the html form, and set the content code type of the form to multi ...

Posted by predator on Wed, 22 Apr 2020 10:42:33 -0700

oom caused by Java Tomcat Max HTTP header size configuration

Max HTTP header size settings server.max-http-header-size=999999999 //953m JVM parameter configuration -Xms800m -Xmx800m Write a rest api @RestController("action") public class HttpHandler { @PostMapping("/get") public String get() { return "get"; } } post access   Server OOM java.lang.OutOfMemoryError: Java heap spa ...

Posted by dellwoodbu on Tue, 21 Apr 2020 08:21:49 -0700

The Java ftp compressed file is packaged into zip and downloaded to the local user through the browser download function

1. Import jar dependency package: ant-1.9.7.jar commons-net-3.3.jar Baidu online: https://pan.baidu.com/s/1u7m5NYans-UK_h8VSEPfbA Extraction code: qy12 2. Create a tool class DownloadFileUtil.java and write the following code: package com.zghky.utils; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStrea ...

Posted by bdee1 on Tue, 21 Apr 2020 07:08:52 -0700

Mavenx learn to find the right way, get started quickly!

1,Maven Why should I learn this technology? In Java Web development, we need to use a large number of jar packages. We need to import them manually; How to make a thing automatically help me import and configure this jar package. So Maven was born! 1.1 Maven project architecture management tool At present, it is convenient for us to impor ...

Posted by PupChow on Tue, 21 Apr 2020 04:49:17 -0700

Four common running modes in php

This article introduces four common ways of running php: CGI, FastCGI, Apache 2 handler and CLI. There is a certain reference value, friends in need can refer to it, hope to help you. There are four common running modes of PHP: CGI, FastCGI, Apache 2 handler and CLI. 1,CGI CGI is the common gateway interface, which is a program. Generally speak ...

Posted by ElectricRain on Mon, 20 Apr 2020 23:57:19 -0700

Shell notes: if and case condition judgment

1, if statement Single branch if statement Syntax (spaces at the beginning and end of brackets cannot be omitted): if [conditional judgment]; then program fi #Or if [conditional judgment] then program fi   Example: #!/bin/bash #If the usage rate of the root partition reaches 80, a warning will be issued and a prompt messag ...

Posted by steviemac on Mon, 20 Apr 2020 08:23:46 -0700

[java framework] Struts2 -- result view and parameter receiving of struts2

1. Results view of struts 2 Each atcion of Struts2 can have different result return methods. There are 11 ways to return the result type attribute in result. The main and most commonly used jump modes are redirect, redirectAction and pather. The type of the specific jump method can be found in struts-default.xml, as follows: <package name=" ...

Posted by budz on Sat, 18 Apr 2020 02:10:09 -0700

HBase operation: Spark read HBase snapshot demo share

**Before * * I shared with you a small demo of Spark reading HBase directly through the interface: HBase-Spark-Read-Demo However, if the amount of data is very large, Spark's direct scanning of HBase table will inevitably cause a lot of pressure on HBase cluster. Based on this, today I'd like to share with you the way spark directly reads HBas ...

Posted by vapokerpro on Fri, 17 Apr 2020 08:28:05 -0700