master-slave | 易学教程

Master / Slave switch in the Zend Framework application layer

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问题 I am writing an application which requires the Master/Slave switch to happen inside the application layer. As it is right now, I instantiate a Zend_Db_Table object on creation of the mapper, and then setDefaultAdapter to the slave. Now inside of the base mapper classe, I have the following method: public function useWriteAdapter() { if(Zend_Db_Table_Abstract::getDefaultAdapter() != $this->_writeDb) { Zend_Db_Table_Abstract::setDefaultAdapter($this->_writeDb); $this->_tableGateway = new Zend

Hudson — Step by step guide to set up master and slave machines

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问题 As you can see, the link to that on the hudson website is dead. So, I was hoping for a little step by step for setting up a windows slave with a linux master. I managed to setup hudson on the windows machine, but how do i link the slave to report back to the master and initiate build from the master to run on the windows slave. Basically how is the flow of data between the master/slave achieved, I know this can be done but there is no documentation online that explicitly says do this. I would

Rails: How to split write/read query across master/slave database

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问题 My website has a very heavy read traffic. A lot heavier than write traffic. To improve the performance of my website I have thought of going with master/slave database configuration. The octupus gem seems to provide what I want, but since my app is huge I can't go though a millions of source code line to change the query distribution(sending read query to slave server and write query to master server). MySQL Proxy seems to be a great way to resolve this issue but since it is in alpha version

Hadoop master cannot start slave with different $HADOOP_HOME

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问题 In master, the $HADOOP_HOME is /home/a/hadoop , the slave's $HADOOP_HOME is /home/b/hadoop In master, when I try to using start-all.sh , then the master name node start successfuly, but fails to start slave's data node with following message: b@192.068.0.2: bash: line 0: cd: /home/b/hadoop/libexec/..: No such file or directory b@192.068.0.2: bash: /home/b/hadoop/bin/hadoop-daemon.sh: No such file or directory any idea on how to specify the $HADOOP_HOME for slave in master configuration? 回答1:

How to make Hadoop servers listening on all IPs

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问题 I'm learning to deploy Hadoop Cluster on 2 machines, one master and one slave. However, after deployment the web app server(i.e. port 8088 on master) is not reachable. I use netstat -ant to check it says like below: proto Recv-Q Send-Q LocalAddress ForeignAddress State ... tcp 0 0 127.0.0.1:8088 *:* LISTEN tcp 0 0 0.0.0.0:56666 *:* LISTEN ... Other servers established by myself, like the one listening on port 56666 , are reachable. I think it maybe the problem that Hadoop web app server is

Is it always the case that Driver must be on a Master node (Yes/No) ? Apache-Spark

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问题 Is it always the case that the Driver (as a program that runs the master node) must be on a master node ? For example, if I setup the ec2 with one master and two workers, does my code that has the main must be executed from the master EC2 instance ? If answer is NO, what would be the best way to set-up the system where the driver is outside the ec2's master node (lets say, Driver is ran from my computer, while Master and Workers are on EC2)? Do I always have to use the spark-submit, or can I

mysql replication - master to slave

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问题 I have successfully set up a master to slave environment and it is definitely working fine. The only problem I have is that selecting count from a table, they are not the same BUT selecting after 5 mins from master, 50 rows are created while on the slave, also 50 rows are created (that's why I said i'm sure that is working fine) Master: +----------+ | COUNT(*) | +----------+ | 77634 | +----------+ 1 row in set (0.00 sec) Slave: +----------+ | COUNT(*) | +----------+ | 76932 | +----------+ 1

CodeIgniter configure different IP for READ and WRITE MySQL data

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问题 My company has been setting up a different server for read and write access of mysql DB. Previously, we use custom php script. However, I was recently given task to create tools by leveraging CI. I've done it on test server. Now, I'm confused, how to implement it on live server. 回答1: Setup multiple 'connection groups' for each server in your database.php config file, then in the Model: $DB1 = $this->load->database('group_one', TRUE); $DB2 = $this->load->database('group_two', TRUE); //read

Slave cannot connect to Master

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问题 I'm trying to configure my laptop as a slave, my master would be a server where Jenkins is installed. I've followed these instructions. However, when it comes to access http://master:8080/ from my slave's browser, internet cannot display the webpage. So I tried the second way, by writing javaws http://master:8080/computer/Slave/slave-agent.jnlp in the cmd prompt and this time I have this error: Could not load file/URL specified: http://master:8080/computer/Slave/slave-agent.jnlp I am new to

MySQL主从（Master-Slave）复制

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本文内容主要来源：官方文档中文版第6章“ MySQL中的复制 ”。本文只记录配置要点。 1. 主数据库配置（通常在 /etc/my.cnf ）：在 [mysqld] 中加入以下几条配置： server-id=1（为任意值） log-bin=mysql-bin binlog_do_db=你要复制的数据库（实际上是要做二进制日志的数据库） binlog_ignore_db=mysql（要忽略的数据库）重启MySQL服务器后进入client，创建数据库用户以便“从数据库”连接： GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%.mydomain.com' IDENTIFIED BY 'slavepass'; （用户名、密码以及从服务器主机地址可自定义）然后刷新读写缓冲区并锁定表读写操作： FLUSH TABLES WITH READ LOCK; 这个时候再另外连接到主机shell（不要关闭当前MySQL连接，否则锁定会解除），开始复制数据库到从数据库（事先要创建同名数据库，也可以使用“ mysqladmin -h 从服务器地址 create 数据库名 ”进行创建）： mysqldump --opt 要复制的数据库 -p主数据库root密码 -R -B | mysql -h从服务器地址要复制的数据库名 -p从数据库root密码复制完后