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This patch adds documentation for the distributed tables used for service_level feature and their meaning and usage. Message-Id: <5b7d2be166c2381ed33094b4545fafe0f142583f.1609170862.git.sarna@scylladb.com>
39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
## Service Level Distributed Data
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There are two system tables that are used to facilitate the service level feature.
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### Service Level Attachment Table
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```CREATE TABLE system_auth.role_attributes (
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role text,
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attribute_name text,
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attribute_value text,
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PRIMARY KEY (role, attribute_name))
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```
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The table was created with generality in mind, but its purpose is to record
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information about roles. The table columns meaning are:
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*role* - the name of the role that the attribute belongs to.
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*attribute_name* - the name of the attribute for the role.
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*attribute_value* - the value of the specified attribute.
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For the service level, the relevant attribute name is `service_level`.
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So for example in order to find out which `service_level` is attached to role `r`
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one can run the following query:
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```SELECT * FROM system_auth.role_attributes WHERE role='r' and attribute_name='service_level'
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```
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### Service Level Configuration Table
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```CREATE TABLE system_distributed.service_levels (
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service_level text PRIMARY KEY);
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```
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The table is used to store and distribute the service levels configuration.
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The table column names meanings are:
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*service_level* - the name of the service level.
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This table is currently a stub and does not hold any parameters yet.
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```
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