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Sharding

Syntax

Sharding Table Rule

CREATE SHARDING TABLE RULE shardingTableRuleDefinition [, shardingTableRuleDefinition] ...

ALTER SHARDING TABLE RULE shardingTableRuleDefinition [, shardingTableRuleDefinition] ...

DROP SHARDING TABLE RULE tableName [, tableName] ...

CREATE DEFAULT SHARDING shardingScope STRATEGY (shardingStrategy)

ALTER DEFAULT SHARDING shardingScope STRATEGY (shardingStrategy)

DROP DEFAULT SHARDING shardingScope STRATEGY;

CREATE SHARDING ALGORITHM shardingAlgorithmDefinition [, shardingAlgorithmDefinition] ...

ALTER SHARDING ALGORITHM shardingAlgorithmDefinition [, shardingAlgorithmDefinition] ...

DROP SHARDING ALGORITHM algorithmName [, algorithmName] ...

CREATE SHARDING KEY GENERATOR keyGeneratorDefinition [, keyGeneratorDefinition] ...

ALTER SHARDING KEY GENERATOR keyGeneratorDefinition [, keyGeneratorDefinition] ...

DROP SHARDING KEY GENERATOR keyGeneratorName [, keyGeneratorName] ...

shardingTableRuleDefinition:
    shardingAutoTableRule | shardingTableRule

shardingAutoTableRule:
    tableName(resources, shardingColumn, algorithmDefinition [, keyGenerateDeclaration])

shardingTableRule:
    tableName(dataNodes [, databaseStrategy] [, tableStrategy] [, keyGenerateDeclaration])

resources:
    RESOURCES(resource [, resource] ...)

dataNodes:
    DATANODES(dataNode [, dataNode] ...)

resource:
    resourceName | inlineExpression

dataNode:
    resourceName | inlineExpression

shardingColumn:
    SHARDING_COLUMN=columnName

algorithmDefinition:
    TYPE(NAME=shardingAlgorithmType [, PROPERTIES([algorithmProperties])])

keyGenerateDeclaration:
    keyGenerateDefinition | keyGenerateConstruction

keyGenerateDefinition:
    KEY_GENERATE_STRATEGY(COLUMN=columnName, strategyDefinition)

shardingScope:
    DATABASE | TABLE

databaseStrategy:
    DATABASE_STRATEGY(shardingStrategy)

tableStrategy:
    TABLE_STRATEGY(shardingStrategy)

keyGenerateConstruction
    KEY_GENERATE_STRATEGY(COLUMN=columnName, KEY_GENERATOR=keyGenerateAlgorithmName)

shardingStrategy:
    TYPE=strategyType, shardingColumn, shardingAlgorithm

shardingAlgorithm:
    existingAlgorithm | autoCreativeAlgorithm

existingAlgorithm:
    SHARDING_ALGORITHM=shardingAlgorithmName

autoCreativeAlgorithm:
    SHARDING_ALGORITHM(algorithmDefinition)

strategyDefinition:
    TYPE(NAME=keyGenerateStrategyType [, PROPERTIES([algorithmProperties])])

shardingAlgorithmDefinition:
    shardingAlgorithmName(algorithmDefinition)

algorithmProperties:
    algorithmProperty [, algorithmProperty] ...

algorithmProperty:
    key=value   

keyGeneratorDefinition: 
    keyGeneratorName (algorithmDefinition)
  • RESOURCES needs to use data source resources managed by RDL
  • shardingAlgorithmType specifies the type of automatic sharding algorithm, please refer to Auto Sharding Algorithm
  • keyGenerateStrategyType specifies the distributed primary key generation strategy, please refer to Key Generate Algorithm
  • Duplicate tableName will not be created
  • shardingAlgorithm can be reused by different Sharding Table Rule, so when executing DROP SHARDING TABLE RULE, the corresponding shardingAlgorithm will not be removed
  • To remove shardingAlgorithm, please execute DROP SHARDING ALGORITHM
  • strategyType specifies the sharding strategy, please refer toSharding Strategy
  • Sharding Table Rule supports both Auto Table and Table at the same time. The two types are different in syntax. For the corresponding configuration file, please refer to Sharding
  • When using the autoCreativeAlgorithm way to specify shardingStrategy, a new sharding algorithm will be created automatically. The algorithm naming rule is tableName_strategyType_shardingAlgorithmType, such as t_order_database_inline

Sharding Binding Table Rule

CREATE SHARDING BINDING TABLE RULES bindTableRulesDefinition [, bindTableRulesDefinition] ...

ALTER SHARDING BINDING TABLE RULES bindTableRulesDefinition [, bindTableRulesDefinition] ...

DROP SHARDING BINDING TABLE RULES bindTableRulesDefinition [, bindTableRulesDefinition] ...

bindTableRulesDefinition:
    (tableName [, tableName] ... )
  • ALTER will overwrite the binding table configuration in the database with the new configuration

Sharding Broadcast Table Rule

CREATE SHARDING BROADCAST TABLE RULES (tableName [, tableName] ... )

ALTER SHARDING BROADCAST TABLE RULES (tableName [, tableName] ... )

DROP SHARDING BROADCAST TABLE RULES
  • ALTER will overwrite the broadcast table configuration in the database with the new configuration

Sharding Scaling Rule

CREATE SHARDING SCALING RULE scalingName [scalingRuleDefinition]

DROP SHARDING SCALING RULE scalingName

ENABLE SHARDING SCALING RULE scalingName

DISABLE SHARDING SCALING RULE scalingName

scalingRuleDefinition:
    [inputDefinition] [, outputDefinition] [, streamChannel] [, completionDetector] [, dataConsistencyChecker]

inputDefinition:
    INPUT ([workerThread] [, batchSize] [, rateLimiter])

outputDefinition:
    OUTPUT ([workerThread] [, batchSize] [, rateLimiter])

completionDetector:
    COMPLETION_DETECTOR (algorithmDefinition)

dataConsistencyChecker:
    DATA_CONSISTENCY_CHECKER (algorithmDefinition)

rateLimiter:
    RATE_LIMITER (algorithmDefinition)

streamChannel:
    STREAM_CHANNEL (algorithmDefinition)

workerThread:
    WORKER_THREAD=intValue

batchSize:
    BATCH_SIZE=intValue

intValue:
    INT
  • ENABLE is used to set which sharding scaling rule is enabled
  • DISABLE will disable the sharding scaling rule currently in use
  • Enabled by default when creating the first sharding scaling rule in a schema

Example

Sharding Table Rule

Key Generator

CREATE SHARDING KEY GENERATOR snowflake_key_generator (
TYPE(NAME=SNOWFLAKE)
);

ALTER SHARDING KEY GENERATOR snowflake_key_generator (
TYPE(NAME=SNOWFLAKE))
);

DROP SHARDING KEY GENERATOR snowflake_key_generator;

Auto Table

CREATE SHARDING TABLE RULE t_order (
RESOURCES(resource_0,resource_1),
SHARDING_COLUMN=order_id,TYPE(NAME=hash_mod,PROPERTIES("sharding-count"=4)),
KEY_GENERATE_STRATEGY(COLUMN=another_id,TYPE(NAME=snowflake))
);

ALTER SHARDING TABLE RULE t_order (
RESOURCES(resource_0,resource_1,resource_2,resource_3),
SHARDING_COLUMN=order_id,TYPE(NAME=hash_mod,PROPERTIES("sharding-count"=16)),
KEY_GENERATE_STRATEGY(COLUMN=another_id,TYPE(NAME=snowflake))
);

DROP SHARDING TABLE RULE t_order;

DROP SHARDING ALGORITHM t_order_hash_mod;

Table

CREATE SHARDING ALGORITHM table_inline (
TYPE(NAME=inline,PROPERTIES("algorithm-expression"="t_order_item_${order_id % 2}"))
);

CREATE SHARDING TABLE RULE t_order_item (
DATANODES("resource_${0..1}.t_order_item_${0..1}"),
DATABASE_STRATEGY(TYPE=standard,SHARDING_COLUMN=user_id,SHARDING_ALGORITHM(TYPE(NAME=inline,PROPERTIES("algorithm-expression"="resource_${user_id % 2}")))),
TABLE_STRATEGY(TYPE=standard,SHARDING_COLUMN=order_id,SHARDING_ALGORITHM=table_inline),
KEY_GENERATE_STRATEGY(COLUMN=another_id,KEY_GENERATOR=snowflake_key_generator)
);

ALTER SHARDING ALGORITHM database_inline (
TYPE(NAME=inline,PROPERTIES("algorithm-expression"="resource_${user_id % 4}"))
),table_inline (
TYPE(NAME=inline,PROPERTIES("algorithm-expression"="t_order_item_${order_id % 4}"))
);

ALTER SHARDING TABLE RULE t_order_item (
DATANODES("resource_${0..3}.t_order_item${0..3}"),
DATABASE_STRATEGY(TYPE=standard,SHARDING_COLUMN=user_id,SHARDING_ALGORITHM=database_inline),
TABLE_STRATEGY(TYPE=standard,SHARDING_COLUMN=order_id,SHARDING_ALGORITHM=table_inline),
KEY_GENERATE_STRATEGY(COLUMN=another_id,KEY_GENERATOR=snowflake_key_generator)
);

DROP SHARDING TABLE RULE t_order_item;

DROP SHARDING ALGORITHM database_inline;

CREATE DEFAULT SHARDING DATABASE STRATEGY (
TYPE = standard,SHARDING_COLUMN=order_id,SHARDING_ALGORITHM=database_inline
);

ALTER DEFAULT SHARDING DATABASE STRATEGY (
TYPE = standard,SHARDING_COLUMN=another_id,SHARDING_ALGORITHM=database_inline
);

DROP DEFAULT SHARDING DATABASE STRATEGY;

Sharding Binding Table Rule

CREATE SHARDING BINDING TABLE RULES (t_order,t_order_item),(t_1,t_2);

ALTER SHARDING BINDING TABLE RULES (t_order,t_order_item);

DROP SHARDING BINDING TABLE RULES;

DROP SHARDING BINDING TABLE RULES (t_order,t_order_item);

Sharding Broadcast Table Rule

CREATE SHARDING BROADCAST TABLE RULES (t_b,t_a);

ALTER SHARDING BROADCAST TABLE RULES (t_b,t_a,t_3);

DROP SHARDING BROADCAST TABLE RULES;

Sharding Scaling Rule

CREATE SHARDING SCALING RULE sharding_scaling(
INPUT(
  WORKER_THREAD=40,
  BATCH_SIZE=1000
),
OUTPUT(
  WORKER_THREAD=40,
  BATCH_SIZE=1000
),
STREAM_CHANNEL(TYPE(NAME=MEMORY, PROPERTIES("block-queue-size"=10000))),
COMPLETION_DETECTOR(TYPE(NAME=IDLE, PROPERTIES("incremental-task-idle-seconds-threshold"=1800))),
DATA_CONSISTENCY_CHECKER(TYPE(NAME=DATA_MATCH, PROPERTIES("chunk-size"=1000)))
);

ENABLE SHARDING SCALING RULE sharding_scaling;

DISABLE SHARDING SCALING RULE sharding_scaling;

DROP SHARDING SCALING RULE sharding_scaling;