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docker storage volume Data Volume Why data volumes (storage volumes) are needed The docker image is made up of multiple read-only layers. When the container is started, the docker loads the read-only layer and adds a read-write layer to the mirror layer. If the running container modifies an existing file, the file will be copied from the ...

order This paper mainly studies the Parser of puma Parser puma/puma/src/main/java/com/dianping/puma/parser/Parser.java public interface Parser extends LifeCycle { BinlogEvent parse(ByteBuffer buf, PumaContext context) throws IOException; } The Parser inherits the life cycle interface, which defines the parse method and resolves ByteBuffer ...

Author: ksfzhaohui https://my.oschina.net/OutOfMemory/blog/3117737 Recently, there is a demand to analyze an order file, and the description file can reach tens of millions of data, each data is about 20 fields, each field is separated by commas, and it needs to be stored in half an hour as much as possible. thinking 1. Estimate file size Bec ...

pydbclib It is a general python relational database operation toolkit. It uses a unified interface to operate various relational databases (such as oracle, mysql, postgres, hive, impala, etc.) for addition, deletion, and query. It is a connection driver package for various python databases (such as sqlalchemy, pymysql, CX_ The encapsulation of ...

One: Background 1. Storytelling Recently, looking at the major technical communities, whether they know, the Nuggets, the Blog Garden or csdn, we can hardly see any articles about sqlserver class shared by small partners. It looks like sqlserver has disappeared in recent years and no one has written it since. It is impossible to write sqlserver ...

Purpose: The 192.168.100.20 server backs up the MySQL database on the 192.168.100.10 server. 1. Configure MySQL server 1) 100.10 MySQL server log in to MYSQL to create two databases [root@centos01 ~]# mysql -uroot -ppwd@123 mysql> create database liyanxin; mysql> create database wangzhaojun; 2) liyanxin database creates tables and write ...

1. Compile and install LNMP and wordpress 1.1 install PHP, php mysql, mysql, PHP FPM [root@c1 ~]# yum install php php-mysql ngnix mariadb-server php-fpm -y 1.2 compile and install nginx 1.2.1 installation dependency package [root@c1 nginx]# yum install gcc pcre-devel openssl-devel zlib-devel -y 1.2.2 creating nginx users [root@c1 ~]# useradd ...

​ In this chapter, we started to formally build a big data environment, with the goal of building a stable big data environment that can be operated and monitored. We will use Ambari to build the underlying Hadoop environment, and use the native way to build Flink, Druid, Superset and other real-time computing environments. Use the combinatio ...

Upgrade plan Scope of influence: During the upgrade, the existing system will not be affected, and the system will maintain normal operation. After the upgrade, the availability test will be conducted for a period of time, and the monitoring on production will be replaced after the system is stable. Upgrade method: This upgrade adopts the blue ...

1,const Indicates that the execution step returns at most one row of data. const usually appears in the equivalent query of the primary key or unique index, such as the equivalent query of the primary key id of the t table:It can be considered that it is as fast as a rocket to locate a record by comparing the equivalence between the primary key ...