Distributed design - Copy

effect

• For data backup, high availability
• Improved throughput, high-performance

classification

• Master-slave architecture
  • performance
    • A master from multiple, separate read and write, to improve throughput
  • Availability
    • Main library a single point, once hung, can not be written
    • Availability from the library
  • consistency
    • Data synchronization there is a delay, when read back from the library may be old data
      • solution
        • Simply ignored, there is a delay is normal
        • For real-time required by interface, read directly from the primary database
    • In the case of separate read and write, to snatch a problem occur concurrently resources
      • Interface consistency requirement, not separate read and write, only the operation of the master library
• Multi-master architecture (back up each other)
  • performance
    • Load Balancing
  • Availability
    • High Availability
  • consistency
    • And a master-slave architecture as
• Master-slave from master
  • high performance
  • High Availability
  • consistency
    • And from the same master
• Standby
  • Main library provides literacy services, prepared by the library to do with failover
  • General performance
    • Set the cache to improve performance
  • High Availability
  • No consistency
  • Ali cloud and widespread use 58

Principle mysql master-slave synchronization