Get follower stats

Auth

Get cross-cluster replication follower stats. The API returns shard-level stats about the "following tasks" associated with each shard for the specified indices.

About cross-cluster replication

Required authorization

Cluster privileges monitor

Path parameters

index union string | string[] required

A comma-delimited list of index patterns.

Query parameters

timeout string · default: 30s

The period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error.

Response

application/json
indices object[] required

An array of follower index statistics.

index string required

The name of the follower index.

shards object[] required

An array of shard-level following task statistics.

bytes_read number required

The total of transferred bytes read from the leader. This is only an estimate and does not account for compression if enabled.

failed_read_requests number required

The number of failed reads.

failed_write_requests number required

The number of failed bulk write requests on the follower.

fatal_exception object
type string required

The type of error

reason union string nullable

A human-readable explanation of the error, in English.

One of: string
stack_trace string

The server stack trace. Present only if the error_trace=true parameter was sent with the request.

caused_by object
Same fields as fatal_exception in shards
root_cause object[]
Same fields as fatal_exception in shards
suppressed object[]
Same fields as fatal_exception in shards
follower_aliases_version number required

The index aliases version the follower is synced up to.

follower_global_checkpoint number required

The current global checkpoint on the follower. The difference between the leader_global_checkpoint and the follower_global_checkpoint is an indication of how much the follower is lagging the leader.

follower_index string required

The name of the follower index.

follower_mapping_version number required

The mapping version the follower is synced up to.

follower_max_seq_no number required

The current maximum sequence number on the follower.

follower_settings_version number required

The index settings version the follower is synced up to.

last_requested_seq_no number required

The starting sequence number of the last batch of operations requested from the leader.

leader_global_checkpoint number required

The current global checkpoint on the leader known to the follower task.

leader_index string required

The name of the index in the leader cluster being followed.

leader_max_seq_no number required

The current maximum sequence number on the leader known to the follower task.

operations_read number required

The total number of operations read from the leader.

operations_written number required

The number of operations written on the follower.

outstanding_read_requests number required

The number of active read requests from the follower.

outstanding_write_requests number required

The number of active bulk write requests on the follower.

read_exceptions object[] required

An array of objects representing failed reads.

exception object required

The exception that caused the read to fail.

type string required

The type of error

reason union string nullable

A human-readable explanation of the error, in English.

One of: string
stack_trace string

The server stack trace. Present only if the error_trace=true parameter was sent with the request.

caused_by object
Same fields as exception in read_exceptions
root_cause object[]
Same fields as exception in read_exceptions
suppressed object[]
Same fields as exception in read_exceptions
from_seq_no number required

The starting sequence number of the batch requested from the leader.

retries number required

The number of times the batch has been retried.

remote_cluster string required

The remote cluster containing the leader index.

shard_id number required

The numerical shard ID, with values from 0 to one less than the number of replicas.

successful_read_requests number required

The number of successful fetches.

successful_write_requests number required

The number of bulk write requests run on the follower.

time_since_last_read string
time_since_last_read_millis number required

The number of milliseconds since a read request was sent to the leader. When the follower is caught up to the leader, this number will increase up to the configured read_poll_timeout at which point another read request will be sent to the leader.

total_read_remote_exec_time string
total_read_remote_exec_time_millis number required

The total time reads spent running on the remote cluster.

total_read_time string
total_read_time_millis number required

The total time reads were outstanding, measured from the time a read was sent to the leader to the time a reply was returned to the follower.

total_write_time string
total_write_time_millis number required

The total time spent writing on the follower.

write_buffer_operation_count number required

The number of write operations queued on the follower.

write_buffer_size_in_bytes number | string required

The total number of bytes of operations currently queued for writing.