/alter/tier

URL: http://<db.host>:<db.port>/alter/tier

Alters properties of an exisiting tier to facilitate resource management.

To disable watermark-based eviction, set both high_watermark and low_watermark to 100.

Input Parameter Description

Name

Type

Description

name

string

Name of the tier to be altered. Must be an existing tier group name.

options

map of string to strings

Optional parameters. The default value is an empty map ( {} ).

Supported Parameters (keys)	Parameter Description
capacity	Maximum size in bytes this tier may hold at once.
high_watermark	Threshold of usage of this tier's resource that once exceeded, will trigger watermark-based eviction from this tier. The minimum allowed value is 0. The maximum allowed value is 100.
low_watermark	Threshold of resource usage that once fallen below after crossing the high_watermark, will cease watermark-based eviction from this tier. The minimum allowed value is 0. The maximum allowed value is 100.
wait_timeout	Timeout in seconds for reading from or writing to this resource. Applies to cold storage tiers only.
persist	If true the system configuration will be written to disk upon successful application of this request. This will commit the changes from this request and any additional in-memory modifications. The default value is true. The supported values are: true false
rank	Apply the requested change only to a specific rank. The minimum allowed value is 0. The maximum allowed value is 10000.

Output Parameter Description

The GPUdb server embeds the endpoint response inside a standard response structure which contains status information and the actual response to the query. Here is a description of the various fields of the wrapper:

Name

Type

Description

status

String

'OK' or 'ERROR'

message

String

Empty if success or an error message

data_type

String

'alter_tier_response' or 'none' in case of an error

data

String

Empty string

data_str

JSON or String

This embedded JSON represents the result of the /alter/tier endpoint:

Name	Type	Description
name	string	Value of input parameter name.
info	map of string to strings	Additional information.

Empty string in case of an error.