RocketMQ Architecture NameServer Cluster Name Servers provide lightweight service discovery and routing. Each Name Server records full routing information, provides corresponding reading and writing service, and supports fast storage expansion, there…

1 Download RockeMQ Package: You need to download it and put it to the OS Image. wget http://apache.claz.org/rocketmq/4.3.2/rocketmq-all-4.3.2-bin-release.zip and unzip the package to /opt/rocketmq 2 Prerequsite JDK installed. 3 Create service account…

目录 1.什么是ACL? 2.ACL基本流程图 3.如何配置ACL 3.1 acl配置文件 3.2 RocketMQ ACL权限可选值 3.3.权限验证流程 4.使用示例 4.1 Broker端安装 4.2 消息发送端示例 4.3 消息消费端示例 @(本节目录) 1.什么是ACL? ACL是access control list的简称,俗称访问控制列表.访问控制,基本上会涉及到用户.资源.权限.角色等概念,那在RocketMQ中上述会对应哪些对象呢? 用户 用户是访问控制的基础要素,也不难理解,…

cncf landscape CNCF Cloud Native Interactive Landscape 1. App Definition and Development 1. Database Vitess:itess is a database clustering system for horizontal scaling of MySQL. Apache CarbonData:Apache CarbonData is an indexed columnar data format…

CNCF Cloud Native Interactive Landscape 1. App Definition and Development 1. Database Vitess:itess is a database clustering system for horizontal scaling of MySQL. Apache CarbonData:Apache CarbonData is an indexed columnar data format for fast analyt…

自从数据库服务器从redhat4.6升级到redhat5.5之后,在使用TSM备份的时候偶尔会出现SQL2043N  查看错误: [db2inst1@limt ~]$ db2 ? SQL2043N SQL2043N Unable to start a child process or thread. Explanation: Unable to start up the child processes or threads required during the processing of a…

方式1 原因:namenode元数据被破坏,需要修复解决:恢复一下namenode hadoop namenode -recover 一路选择Y,一般就OK了 方式2 Need to copy the edits file to the journal node (I have 3 journal node s101 s102 s103) [centos@s100 /home/centos/hadoop/ha/dfs/name1/current]$scp edits_00000000000000…

NetScaler Best Practice With VMAC In A High Availability Configuration https://www.citrix.com/blogs/2015/01/05/netscaler-best-practice-with-vmac-in-a-high-availability-configuration/ The NetScaler appliance is an extremely flexible application delive…

Hadoop常用操作 1.Hadoop安装 略 2.Hadoop配置 略 3.Hadoop多目录配置 namenode和datanode节点下都可以进行多个目录的配置,但是意义不同.namenode的多目录配置是副本策略,保证数据可靠性,datanode多目录配置是对容量进行扩容,由于datanode已经有副本机制了. [hdfs-site.xml] <!-- namenode多目录配置 --> <property> <name>dfs.namenode.name.di…

ls命令概述 ls命令用于显示文件目录列表,和Windows系统下DOS命令dir类似.当执行ls命令时,默认显示的只有非隐藏文件的文件名.以文件名进行排序及文件名代表的颜色显示.当不加参数时,默认列出当前目录的列表信息.ls命令使用频率非常高,参数也非常多,多达四五十个,本文只介绍一部分常用的参数,其他参数可以通过man命令查看帮助手册. 说明:在linux下,文件名以点.开头表示该文件为隐藏文件,如.bashrc. ls命令语法 ls [选项] [目录或文件名] 参数: -a:--all的缩…