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Get follower info API

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Get follower info API

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Retrieves information about all follower indices.

Request

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GET /<index>/_ccr/info

Prerequisites

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If the Elasticsearch security features are enabled, you must have monitor cluster privileges. For more information, see Security privileges.

Description

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This API lists the parameters and the status for each follower index. For example, the results include follower index names, leader index names, replication options and whether the follower indices are active or paused.

Path parameters

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<index>: (Required, string) A comma-delimited list of follower index patterns.

Query parameters

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master_timeout: (Optional, time units) Period to wait for the master node. If the master node is not available before the timeout expires, the request fails and returns an error. Defaults to 30s. Can also be set to -1 to indicate that the request should never timeout.

Response body

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follower_indices

(array) An array of follower index statistics.

Properties of objects in follower_indices

follower_index: (string) The name of the follower index.
leader_index: (string) The name of the index in the leader cluster that is followed.

parameters

(object) An object that encapsulates cross-cluster replication parameters. If the follower index’s status is paused, this object is omitted.

Properties of parameters

max_outstanding_read_requests: (long) The maximum number of outstanding read requests from the remote cluster.
max_outstanding_write_requests: (integer) The maximum number of outstanding write requests on the follower.
max_read_request_operation_count: (integer) The maximum number of operations to pull per read from the remote cluster.
max_read_request_size: (byte value) The maximum size in bytes of per read of a batch of operations pulled from the remote cluster.
max_retry_delay: (time value) The maximum time to wait before retrying an operation that failed exceptionally. An exponential backoff strategy is employed when retrying.
max_write_buffer_count: (integer) The maximum number of operations that can be queued for writing. When this limit is reached, reads from the remote cluster are deferred until the number of queued operations goes below the limit.
max_write_buffer_size: (byte value) The maximum total bytes of operations that can be queued for writing. When this limit is reached, reads from the remote cluster are deferred until the total bytes of queued operations goes below the limit.
max_write_request_operation_count: (integer) The maximum number of operations per bulk write request executed on the follower.
max_write_request_size: (byte value) The maximum total bytes of operations per bulk write request executed on the follower.
read_poll_timeout: (time value) The maximum time to wait for new operations on the remote cluster when the follower index is synchronized with the leader index. When the timeout has elapsed, the poll for operations returns to the follower so that it can update some statistics, then the follower immediately attempts to read from the leader again.

remote_cluster

(string) The remote cluster that contains the leader index.

status

(string) Whether index following is active or paused.

Examples

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This example retrieves follower info:

response = client.ccr.follow_info(
  index: 'follower_index'
)
puts response

GET /follower_index/_ccr/info

If the follower index is active, the API returns the following results:

{
  "follower_indices": [
    {
      "follower_index": "follower_index",
      "remote_cluster": "remote_cluster",
      "leader_index": "leader_index",
      "status": "active",
      "parameters": {
        "max_read_request_operation_count": 5120,
        "max_read_request_size": "32mb",
        "max_outstanding_read_requests": 12,
        "max_write_request_operation_count": 5120,
        "max_write_request_size": "9223372036854775807b",
        "max_outstanding_write_requests": 9,
        "max_write_buffer_count": 2147483647,
        "max_write_buffer_size": "512mb",
        "max_retry_delay": "500ms",
        "read_poll_timeout": "1m"
      }
    }
  ]
}

If the follower index is paused, the API returns the following results:

{
  "follower_indices": [
    {
      "follower_index": "follower_index",
      "remote_cluster": "remote_cluster",
      "leader_index": "leader_index",
      "status": "paused"
    }
  ]
}

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