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| # Data partitioning | ||
|
|
||
| Using a single non-distributed database can become a bottleneck for applications that have high throughput | ||
| requirements. To be able to spread the load over more than one database the event journal, snapshot store and | ||
| durable state can be split up over multiple tables and physical backend databases. | ||
|
|
||
| The data is partitioned by the slices that are used for @ref[`eventsBySlices`](query.md#eventsbyslices) and | ||
| @extref:[Projections](akka-projection:r2dbc.html). You can configure how many data partitions that are needed. | ||
| A data partition corresponds to a separate database table. For example, 4 data partitions means that slice range | ||
| (0 to 255) maps to data partition 0, (256 to 511) to data partition 1, (512 to 767) to data partition 2, | ||
| and (768 to 1023) to data partition 3. | ||
|
|
||
| Number of data partitions must be between 1 and 1024 and a whole number divisor of 1024 (number of slices), e.g. | ||
| 2, 4, 8, 16. The tables will have the data partition as suffix, e.g. event_journal_0, event_journal_1. | ||
|
|
||
| Those tables can be located in physically separate databases. Number of databases must be a whole number divisor | ||
| of number of partitions, and less than or equal to number of partitions. For example, 8 data partitions and 2 databases | ||
| means that there will be a total of 8 tables in 2 databases, i.e. 4 tables in each database. | ||
|
|
||
| ## Example | ||
|
|
||
| If we configure 8 data partitions and 4 databases it will look like this: | ||
|
|
||
|  | ||
|
|
||
| Based on the persistence id an individual entity will map to a specific slice and the entity will read and write to | ||
| the table that covers corresponding slice range. | ||
|
|
||
| If we have 16 projection instances each projection instance will consume events from 64 slices. The query to retrieve | ||
| events from these slices always map to one single table that covers the slice range. There can be more projection | ||
| instances than number of data partitions (tables), but not less. Less projection instances than number of data | ||
| partitions would result in queries that would span over more than one table, which would be inefficient and therefore | ||
| not allowed. | ||
|
|
||
| Each database may host several of the data partition tables. Each database requires a separate connection factory | ||
| and connection pool. | ||
|
|
||
| ## Configuration | ||
|
|
||
| The data partitions are configured with: | ||
|
|
||
| @@snip [reference.conf](/core/src/main/resources/reference.conf) { #data-partition-settings } | ||
|
|
||
| When using more than one database you must define corresponding number of connection factories. The connection-factory | ||
| setting will have the data partition range as suffix, e.g. with 8 data partitions and | ||
| 4 databases the connection factory settings would be: | ||
|
|
||
| ```hcon | ||
| akka.persistence.r2dbc { | ||
| data-partition { | ||
| number-of-partitions = 8 | ||
| number-of-databases = 4 | ||
| } | ||
| connection-factory = ${akka.persistence.r2dbc.postgres} | ||
| connection-factory-0-1 = ${akka.persistence.r2dbc.connection-factory} | ||
| connection-factory-0-1.host = ${?DB_HOST_0} | ||
| connection-factory-2-3 = ${akka.persistence.r2dbc.connection-factory} | ||
| connection-factory-2-3.host = ${?DB_HOST_1} | ||
| connection-factory-4-5 = ${akka.persistence.r2dbc.connection-factory} | ||
| connection-factory-4-5.host = ${?DB_HOST_2} | ||
| connection-factory-6-7 = ${akka.persistence.r2dbc.connection-factory} | ||
| connection-factory-6-7.host = ${?DB_HOST_3} | ||
| } | ||
| ``` | ||
|
|
||
| ## Schema | ||
|
|
||
| Each data partition corresponds to a table. You can copy the DDL statements for the tables and indexes from | ||
| @ref[Creating the schema](getting-started.md#creating-the-schema) but change the table and index names to include | ||
| data partition suffix. For example `event_journal_0`, `event_journal_0_slice_idx`, `event_journal_1`, `event_journal_1_slice_idx`. | ||
| Note that the index must also reference the parent table with same data partition suffix. | ||
|
|
||
| ## Changing data partitions | ||
|
|
||
| The configuration of data partitions and databases **must not** be changed in a rolling update, since the data must | ||
| be moved between the tables and databases if the configuration is changed. The application must be stopped while moving | ||
| the data. | ||
|
|
||
| The data can be copied between tables with SQL such as: | ||
| ```sql | ||
| CREATE TABLE event_journal_0 AS (SELECT * FROM event_journal WHERE slice BETWEEN 0 AND 127); | ||
| CREATE TABLE event_journal_1 AS (SELECT * FROM event_journal WHERE slice BETWEEN 128 AND 255); | ||
| ``` | ||
|
|
||
| Remember to also @ref[create the slice index](#schema). | ||
|
|
||
| Alternatively, @ref[create the tables](#schema) first and insert the data with SQL such as: | ||
| ```sql | ||
| INSERT INTO event_journal_0 SELECT * FROM event_journal WHERE slice BETWEEN 0 AND 127; | ||
| INSERT INTO event_journal_1 SELECT * FROM event_journal WHERE slice BETWEEN 128 AND 255; | ||
| ``` | ||
|
|
||
| There are many other ways to move in an efficient way depending on what database you use, such as backups, sqldump and | ||
| other export/import tools. | ||
|
|
||
| The number of tables and their names don't change by the number of configured databases. If you think you will | ||
| need more than one database in the future it can be good to start with for example 8 data partitions (tables) | ||
| in a single database. That will make it easier to move the full tables to the additional databases later. |
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