Cluster decommission
Introduced 0.1.0
The cluster decommission operation adds support decommissioning based on awareness. It greatly benefits multi-zone deployments, where awareness attributes, such as zones, can aid in applying new upgrades to a cluster in a controlled fashion. This is especially useful during outages, in which case, you can decommission the unhealthy zone to prevent replication requests from stalling and prevent your request backlog from becoming too large.
For more information about allocation awareness, see Shard allocation awareness.
HTTP and Path methods
PUT /_cluster/decommission/awareness/{awareness_attribute_name}/{awareness_attribute_value}
GET /_cluster/decommission/awareness/{awareness_attribute_name}/_status
DELETE /_cluster/decommission/awareness
URL parameters
| Parameter | Type | Description |
|---|---|---|
| awareness_attribute_name | String | The name of awareness attribute, usually zone. |
| awareness_attribute_value | String | The value of the awareness attribute. For example, if you have shards allocated in two different zones, you can give each zone a value of zone-a or zoneb. The cluster decommission operation decommissions the zone listed in the method. |
Example: Decommissioning and recommissioning a zone
You can use the following example requests to decommission and recommission a zone:
Request
The following example request decommissions zone-a:
PUT /_cluster/decommission/awareness/<zone>/<zone-a>
If you want to recommission a decommissioned zone, you can use the DELETE method:
DELETE /_cluster/decommission/awareness
Response
{
"acknowledged": true
}
Example: Getting zone decommission status
The following example requests returns the decommission status of all zones.
Request
GET /_cluster/decommission/awareness/zone/_status
Response
{
"zone-1": "INIT | DRAINING | IN_PROGRESS | SUCCESSFUL | FAILED"
}
Next steps
- For more information about zone awareness and weight, see Cluster awareness.
- For more information about allocation awareness, see Cluster formation.