Shadow DB

Background

Please refer to the following configuration in order to use the ShardingSphere shadow DB feature in ShardingSphere-Proxy.

Parameters

  1. rules:
  2. - !SHADOW
  3.   dataSources:
  4.     shadowDataSource:
  5.       productionDataSourceName: # production data source name
  6.       shadowDataSourceName: # shadow data source name
  7.   tables:
  8.     <table_name>:
  9.       dataSourceNames: # shadow table associates shadow data source name list
  10.         - <shadow_data_source>
  11.       shadowAlgorithmNames: # shadow table associates shadow algorithm name list
  12.         - <shadow_algorithm_name>
  13.   defaultShadowAlgorithmName: # default shadow algorithm name (option)
  14.   shadowAlgorithms:
  15.     <shadow_algorithm_name> (+): # shadow algorithm name
  16.       type: # shadow algorithm type
  17.       props: # shadow algorithm attribute configuration

Please refer to Built-in shadow algorithm list for more details.

Procedure

  1. Configure shadow DB rules in the YAML file, including data sources, shadow library rules, global properties and other configuration items;
  2. Call the createDataSource() method of the YamlShardingSphereDataSourceFactory object to create a ShardingSphereDataSource based on the configuration information in the YAML file.

Sample

The YAML configuration sample of shadow DB is as follows:

  1. dataSources:
  2.    ds:
  3.       url: jdbc:mysql://127.0.0.1:3306/ds?serverTimezone=UTC&useSSL=false
  4.       username: root
  5.       password:
  6.       connectionTimeoutMilliseconds: 30000
  7.       idleTimeoutMilliseconds: 60000
  8.       maxLifetimeMilliseconds: 1800000
  9.       maxPoolSize: 50
  10.       minPoolSize: 1
  11.    shadow_ds:
  12.       url: jdbc:mysql://127.0.0.1:3306/shadow_ds?serverTimezone=UTC&useSSL=false
  13.       username: root
  14.       password:
  15.       connectionTimeoutMilliseconds: 30000
  16.       idleTimeoutMilliseconds: 60000
  17.       maxLifetimeMilliseconds: 1800000
  18.       maxPoolSize: 50
  19.       minPoolSize: 1
  21. rules:
  22. - !SHADOW
  23.   dataSources:
  24.     shadowDataSource:
  25.       productionDataSourceName: ds
  26.       shadowDataSourceName: shadow_ds
  27.   tables:
  28.     t_order:
  29.       dataSourceNames: 
  30.         - shadowDataSource
  31.       shadowAlgorithmNames: 
  32.         - user_id_insert_match_algorithm
  33.         - simple_hint_algorithm
  34.   shadowAlgorithms:
  35.     user_id_insert_match_algorithm:
  36.       type: REGEX_MATCH
  37.       props:
  38.         operation: insert
  39.         column: user_id
  40.         regex: "[1]"
  41.     simple_hint_algorithm:
  42.       type: SIMPLE_HINT
  43.       props:
  44.         foo: bar