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转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/51785118Xtrabackup主要包含两个工具xtrabackup：是用于热备份innodb, xtradb表中数据的工具，不能备份其他类型的表，也不能备份数据表结构；innobackupex：是将xtrabackup进行封装的perl脚本，可以备份和恢复MyISAM表以及数据表结构。1.下载Xtrabackup备份工具，选source code安装包https://www.percona.com/downloads/XtraBackup/LATEST/2.在线安装文档https://www.percona.com/doc/percona-xtrabackup/2.2/index.html3.解压tar -xzvf percona-xtrabackup-2.1.7.tar.gz 4.安装perl环境(DBI/DBD) yum install perl-DBIx-Simple.noarchyum install perl-DBD-MySQL.x86_64yum install perl*5.Prerequisites$ yum install cmake gcc gcc-c++ libaio libaio-devel automake autoconf ...继续阅读 (38)

转载请声明出处：http://blog.csdn.net/guoyjoe/article/details/51589704一、去MySQL官方网站下载源码http://dev.mysql.com/downloads/mysql/二、安装Mysql源码程序编辑器三、导入Mysql源码在Source Insight开发工具中：Projecet--->New，操作如下：四、Mysql源码入口   Mysqld.cc---> Mysqld_main五、如果找不到   Mysqld.cc，解决如下（Source Insight3.5中如何加入.cc文件）：    1.在Project菜单下，如下图所示，取消"Show only known document types"，然后手工在文件列表中选取：   2.先在Options菜单下，打开Document Options设置对话框并按下图所示设置添加.cc文件类型到C++ Source File中：3.关闭SI，然后重新运行SI，新建包含.cc文件的工程，此时你刚刚添加进配置的.cc文件已经可以自动加入到SI工程中了。六、找到mysqld.cc七、开启Mysql源码编辑和浏览模式，这是深入研究Mysql数据库的第一步！！！ ...继续阅读 (114)

http://www.jdon.com/artichect/paxos.html       这是一个有关Paxos算法非常形象的讲解与示范。Paxos是能够基于一大堆完全不可靠的网络条件下却能可靠确定地实现共识一致性的算法。也就是说：它允许一组不一定可靠的处理器（服务器）在某些条件得到满足情况下就能达成确定的安全的共识，如果条件不能满足也确保这组处理器（服务器）保持一致。什么是共识？具体来说是这样：分布式系统中由于网络之间通讯可能会中断，虽然概率很低，但是没有100%完美的网络因此，依靠网络通讯的计算机之间要达成共识就比较困难，假设有X, Y和Z三台计算机谋划在周一攻击人类世界，它们的攻击计划是只要所有计算机可用于战斗时就一起进行攻击，不落下任何一台机器，但是当他们决定具体什么时间开始攻击时，在这个关键问题上往往会出错。一个基本问题是，每台机器都有自己的攻击时间建议，计算机X可以建议在08:00时间，因为这个时间正是周一早晨，而人们刚刚过完狂欢的周末休息天，但是计算机Z认为13:00比较好，理由当然也有一大堆，让这三台计算机基于某个时刻达成共识是非常困难的，因此，也给人类反击留下了机会。另外一个情况是，这三台计算机是位于世界不同的位置，之间通讯或许通过电缆或者其他不太可靠的网络设备通讯，如果X建议在08:00，它必须确认它的这个建议能够到达 ...继续阅读 (76)

转载：http://www.cnblogs.com/haippy/archive/2011/12/10/2282943.html一致性Hash算法背景一致性哈希算法在1997年由麻省理工学院的Karger等人在解决分布式Cache中提出的，设计目标是为了解决因特网中的热点(Hot spot)问题，初衷和CARP十分类似。一致性哈希修正了CARP使用的简单哈希算法带来的问题，使得DHT可以在P2P环境中真正得到应用。但现在一致性hash算法在分布式系统中也得到了广泛应用，研究过memcached缓存数据库的人都知道，memcached服务器端本身不提供分布式cache的一致性，而是由客户端来提供，具体在计算一致性hash时采用如下步骤：首先求出memcached服务器（节点）的哈希值，并将其配置到0～232的圆（continuum）上。然后采用同样的方法求出存储数据的键的哈希值，并映射到相同的圆上。然后从数据映射到的位置开始顺时针查找，将数据保存到找到的第一个服务器上。如果超过232仍然找不到服务器，就会保存到第一台memcached服务器上。          从上图的状态中添加一台memcached服务器。余数分布式算法由于保存键的服务器会发生巨大变化而影响缓存的命中率，但Consistent Hashing中，只有在园（cont ...继续阅读 (10)

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/51447005一、用sys用户登录创建视图：show_hidden_parameter  sys@ZJEDU>conn / as sysdbasys@ZJEDU>create or replace view show_hidden_parameter                                                                                       (inst_id,NUM , NAME , TYPE , VALUE , DISPLAY_VALUE, ISDEFAULT , ISSES_MODIFIABLE , ISSYS_MODIFIABLE , ISPDB_ ...继续阅读 (31)

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/51376930一、下载Sublime Text 31、登录Sublime官网http://www.sublimetext.com/2、点Download下载最新版本Windows 64 bit - also available as a portable version二、安装Sublime Text 3  很简单（略）三、Sublime Text 3 TAB中文乱码解决1、备份：sublime text 3 -->Preference -->Settings-User{ "font_size": 16, "ignored_packages": [ "Vintage" ] }2、在sublime text 3中，Preference, Settings-User，添加：写道"dpi_scale": 1.0, 我的Settings-User配置：写道{ "dpi_scale": 1.0, "font_face": "Consolas", "font_size": 17, &qu ...继续阅读 (39)

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/49924557一、邮箱收到一堆监控，报警内空大致如下，很明显是CPU不够用了，IO也有点问题：主机： bwebser2__10.253.5.198 时间： 2015.11.15 15:25:17状态： PROBLEM 级别： Warning报警原因： Processor load is too high on bwebser2内容： Processor load (1 min average per core)：value=52.53原始事件ID: 30605主机： bwebser2__10.253.5.198时间： 2015.11.18 15:42:23 状态： PROBLEM级别： Warning 报警原因： Disk I/O is overloaded on bwebser2 内容： CPU iowait time：value=68.7 %原始事件ID: 30812二、用top查看进程，发现有近2000个进程[root@bwebser2 ~]# top top - 10:00:32 up 184 days, 19:55, 2 users, load average: 49.39, 52.06, 53.04 Tasks ...继续阅读 (37)

一、官方文档：http://www.cloudera.com/content/www/en-us/documentation/enterprise/latest/topics/cdh_ig_hdfs_cluster_deploy.html二、下载包:archive.cloudera.com/cdh5 #Index of /cdh5/redhat/6/x86_64/cdh/cloudera-cdh5.repo/复制链接地址1、下载yum源 #cd /etc/yum.repos.d/wgethttp://archive.cloudera.com/cdh5/redhat/6/x86_64/cdh/cloudera-cdh5.repo2、查看yum包yum list |grep cdh3、安装hdfsyum -y install hadoop-hdfs-namenode hadoop-hdfs-datanode hadoop-hdfs-journalnode #节点1，主节点yum -y install hadoop-hdfs-datanode hadoop-hdfs-journalnode hadoop-client hadoop-yarn-nodemanager hadoop-yarn #节点2，从节点yum -y install hadoop-hdfs-datanode had ...继续阅读 (69)

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/48805847**********************************          MySQL锁的管理机制**********************************MySQL server层面的一些锁• table-level locking（表级锁）• page-level locking（页级锁）• row-level locking（行级锁）————————————————————————————————————————————————————————————————————一、表级锁：直接锁定整张表，在你锁定期间，其它进程无法对该表进行写操作。如果你是写锁，则其它进程则读也不允许.  对MyISAM表进行表级锁定MyISAM表的锁 • 读锁，LOCK TABLE GYJ_T1 READ，自身只读，不能写；其他线程仍可读，不能写。多个线程都可提交read lock。 • 写锁，LOCK TABLE GYJ_T1 [LOW_PRIORITY] WRITE ，自身可读写；其他线程完全不可读写。 • 释放锁，UNLOCK TABLES • SELEC ...继续阅读 (39)