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Sharding Algorithm

Auto Sharding Algorithm

Modulo Sharding Algorithm

Type: MOD

Attributes:

Name DataType Description
sharding-count int Sharding count

Hash Modulo Sharding Algorithm

Type: HASH_MOD

Attributes:

Name DataType Description
sharding-count int Sharding count

Volume Based Range Sharding Algorithm

Type: VOLUME_RANGE

Attributes:

Name DataType Description
range-lower long Range lower bound, throw exception if lower than bound
range-upper long Range upper bound, throw exception if upper than bound
sharding-volume long Sharding volume

Boundary Based Range Sharding Algorithm

Type: BOUNDARY_RANGE

Attributes:

Name DataType Description
sharding-ranges String Range of sharding border, multiple boundaries separated by commas

Auto Interval Sharding Algorithm

Type: AUTO_INTERVAL

Attributes:

Name DataType Description
datetime-lower String Shard datetime begin boundary, pattern: yyyy-MM-dd HH:mm:ss
datetime-upper String Shard datetime end boundary, pattern: yyyy-MM-dd HH:mm:ss
sharding-seconds long Max seconds for the data in one shard, allows sharding key timestamp format seconds with time precision, but time precision after seconds is automatically erased

Standard Sharding Algorithm

Apache ShardingSphere built-in standard sharding algorithm are:

Inline Sharding Algorithm

With Groovy expressions, InlineShardingStrategy provides single-key support for the sharding operation of = and IN in SQL. Simple sharding algorithms can be used through a simple configuration to avoid laborious Java code developments. For example, t_user_$->{u_id % 8} means table t_user is divided into 8 tables according to u_id, with table names from t_user_0 to t_user_7. Please refer to Inline Expression for more details.

Type: INLINE

Attributes:

Name DataType Description Default Value
algorithm-expression String Inline expression sharding algorithm -
allow-range-query-with-inline-sharding (?) boolean Whether range query is allowed. Note: range query will ignore sharding strategy and conduct full routing false

Interval Sharding Algorithm

Type: INTERVAL

Attributes:

Name DataType Description Default Value
datetime-pattern String Timestamp pattern of sharding value, must can be transformed to Java LocalDateTime. For example: yyyy-MM-dd HH:mm:ss, yyyy-MM-dd or HH:mm:ss etc. But Gy-MM etc. related to java.time.chrono.JapaneseDate are not supported -
datetime-lower String Datetime sharding lower boundary, pattern is defined datetime-pattern -
datetime-upper (?) String Datetime sharding upper boundary, pattern is defined datetime-pattern Now
sharding-suffix-pattern String Suffix pattern of sharding data sources or tables, must can be transformed to Java LocalDateTime, must be consistent with datetime-interval-unit. For example: yyyyMM -
datetime-interval-amount (?) int Interval of sharding value 1
datetime-interval-unit (?) String Unit of sharding value interval, must can be transformed to Java ChronoUnit’s Enum value. For example: MONTHS DAYS

Complex Sharding Algorithm

Complex Inline Sharding Algorithm

Please refer to Inline Expression for more details.

Type: COMPLEX_INLINE

Name DataType Description Default Value
sharding-columns (?) String sharing column names -
algorithm-expression String Inline expression sharding algorithm -
allow-range-query-with-inline-sharding (?) boolean Whether range query is allowed. Note: range query will ignore sharding strategy and conduct full routing false

Hint Sharding Algorithm

Hint Inline Sharding Algorithm

Please refer to Inline Expression for more details.

Type: COMPLEX_INLINE

Name DataType Description Default Value
algorithm-expression String Inline expression sharding algorithm ${value}

Class Based Sharding Algorithm

Realize custom extension by configuring the sharding strategy type and algorithm class name.

Type：CLASS_BASED

Attributes：

Name DataType Description
strategy String Sharding strategy type, support STANDARD, COMPLEX or HINT (case insensitive)
algorithmClassName String Fully qualified name of sharding algorithm