Voting configuration exclusions API

Voting configuration exclusions API

Adds or removes master-eligible nodes from the voting configuration exclusion list.

Request

POST /_cluster/voting_config_exclusions?node_names=<node_names>

POST /_cluster/voting_config_exclusions?node_ids=<node_ids>

DELETE /_cluster/voting_config_exclusions

Prerequisites

Description

By default, if there are more than three master-eligible nodes in the cluster and you remove fewer than half of the master-eligible nodes in the cluster at once, the voting configuration automatically shrinks.

If you want to shrink the voting configuration to contain fewer than three nodes or to remove half or more of the master-eligible nodes in the cluster at once, use this API to remove departing nodes from the voting configuration manually. The API adds an entry for each specified node to the cluster’s voting configuration exclusions list. It then waits until the cluster has reconfigured its voting configuration to exclude the specified nodes.

Clusters should have no voting configuration exclusions in normal operation. Once the excluded nodes have stopped, clear the voting configuration exclusions with DELETE /_cluster/voting_config_exclusions. This API waits for the nodes to be fully removed from the cluster before it returns. If your cluster has voting configuration exclusions for nodes that you no longer intend to remove, use DELETE /_cluster/voting_config_exclusions?wait_for_removal=false to clear the voting configuration exclusions without waiting for the nodes to leave the cluster.

If the API fails, you can safely retry it. Only a successful response guarantees that the node has been removed from the voting configuration and will not be reinstated.

Voting exclusions are required only when you remove at least half of the master-eligible nodes from a cluster in a short time period. They are not required when removing master-ineligible nodes or fewer than half of the master-eligible nodes.

For more information, see Removing master-eligible nodes.

Query parameters

node_names

A comma-separated list of the names of the nodes to exclude from the voting configuration. If specified, you may not also specify ?node_ids.

node_ids

A comma-separated list of the persistent ids of the nodes to exclude from the voting configuration. If specified, you may not also specify ?node_names.

timeout

(Optional, time units) When adding a voting configuration exclusion, the API waits for the specified nodes to be excluded from the voting configuration before returning. The period of time to wait is specified by the ?timeout query parameter. If the timeout expires before the appropriate condition is satisfied, the request fails and returns an error. Defaults to 30s.

wait_for_removal

(Optional, Boolean) Specifies whether to wait for all excluded nodes to be removed from the cluster before clearing the voting configuration exclusions list. Defaults to true, meaning that all excluded nodes must be removed from the cluster before this API takes any action. If set to false then the voting configuration exclusions list is cleared even if some excluded nodes are still in the cluster.

Examples

Adds nodes named nodeName1 and nodeName2 to the voting configuration exclusions list:

  1. POST /_cluster/voting_config_exclusions?node_names=nodeName1,nodeName2

Remove all exclusions from the list:

  1. DELETE /_cluster/voting_config_exclusions