Summary of the problem: After I completed the data warehouse modeling, one day I opened my dbeaver again and all the data was gone. I found many solutions but could not solve my problem. In a fit of anger, I deleted hive and all tables. Start over 1. Hive data warehouse environment construction Hive installation […]
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CentOS7 Hadoop3.X pseudo-distributed environment construction
Build environment: windows10, VMware16.2.3, centOS7.9, jdk-8u162-linux-x64.tar.gz, hadoop3.1.0 Links to Hadoop for various versions of Hadoop jdk8 download link jdk 1. Basic configuration preparations 1.1 Static IP address and other configurations Note: If you are prompted for insufficient permissions, you need to use root permissions. 1.1.1 Non-clone machine configuration static IP address ####1.1.2 Configure a static […]
Local construction of Elastic Stack (Elasticsearch + kibana + Logstash + FileBeat + APM) 7.17.14 version
Local construction of Elastic Stack (Elasticsearch + kibana + Logstash + FileBeat + APM) 7.17.14 version 1. Foreword: 1. This article is a non-cluster environment configuration description for the installation of Elastic Stack version 7.17.14. If you are using the 8.x version of the Elastic Stack product, this article does not apply. 2. The example […]
Zookeeper cluster construction and deployment
1.Zookeeper introduction Zookeeper is a distributed coordination component developed by Yahoo based on Chubby’s ideas and later donated to Apache. It is mainly used to solve distributed data consistency problems. Distributed applications can implement functions such as data publishing/subscription, load balancing, naming service, distributed coordination/notification, cluster management, Master election, configuration management, distributed locks and distributed […]
Construct an array object using a sequence of bytes
“How are arrays in .NET laid out in memory? 》Introduces a memory layout for array objects under .NET. Now that we know the memory layout, we can naturally create a byte sequence to represent an array object according to this layout rule, just like “Draw an object in memory in pure binary form” to construct […]
[RSYSLOG Series] rsyslog remote server construction
Foreword In Linux systems, rsyslog is often used as a logging tool. The full name of Rsyslog is rocket-fast system for log. It provides high performance, high security functions and modular design. It can accept logs from various sources and output them to different destinations. At the same time, rsyslog can pass a variety of […]
STL–vector container (construction, traversal, insertion and deletion, capacity size, data access, dynamic expansion, etc.)
vector Foreword In the past few days, I have used STL a lot when writing code, and I have also felt the power of STL, so I reviewed the content of STL again, and summarized and extracted some basic things and important content. This is a vector article . C++’s STL provides us with many […]
Hadoop fully distributed construction
Foreword There are always various problems encountered when configuring a Hadoop cluster. Here is a complete summary of the complete Hadoop fully distributed configuration process, hoping to help more people. Virtual machine preparation A distributed cluster requires three virtual machines. I won’t explain too much here, just clone them directly. 1. Modify the host name […]
Modern C++ conversion constructors and type conversion functions
In C/C++, different data types can be converted to each other. The type that does not require the user to specify how to convert is called automatic type conversion (implicit type conversion), and the type that requires the user to explicitly specify how to convert is called forced type conversion. Whether it is automatic type […]
Spring dependency injection methods: set injection and constructor injection
Spring Spring6 enables Log4j2 logging framework dependency injection set injection set injects simple types Classic case: injecting values into attributes of the data source: Inject into array Inject into List collection Inject Set collection Inject into Map collection constructor injection Spring6 enables Log4j2 logging framework Starting from Spring 5, the integrated logging framework supported by […]