The number of Explorer in the same domain concurrent load is limited, such as IE6 and IE7 are two, IE8 is 6, chrome versions is not the same, usually 4 to 6. Taobao home need to load 126 resources, then such a small number of concurrent connections will naturally be loaded for a long time. So front-end developers are often distributed at multiple domain names, disguised to circumvent this limitation browsers, but also to prepare for the CDN will work these resource files.
With the rapid rise in traffic and the amount of data, problems soon came out, the first question appears in the database. MySQL was the fourth edition, we use the default storage engine MyISAM, this storage engine will lock the table when writing data. When the Master to Slave sync data when the cause Slave write, so must wait Slave reads. Another point of conflict is the primary key on the Slave will occur, often cause the synchronization to stop, so obviously something you posted has been successful, but they can not find. In addition, MySQL year than today's MySQL, the capacity and security of the database, there are many inherent deficiencies (and compared to Oracle)
MySQL now there is such a problem?
unknown
Why use MyISAM, instead of using InnoDB?
MyISAM does not support the type of advanced processing transaction processing, while InnoDB type support. MyISAM table type performance is emphasized, which performs several times faster than InnoDB type
specific reference: MyISAM InnoDB difference
Load balancing: LVS (Linux Virtual Server)
CDN: Content Delivery Network, the content distribution network, mainly to store JS, CSS, images, etc.
Hadoop: a distributed system architecture, developed by the Apache Foundation. Users can distributed without knowing the underlying details of the development of distributed applications. Full use of the cluster of high-speed computing power and storage. Reference: Baidu Encyclopedia