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cat recovery API

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cat recovery API

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cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the index recovery API.

Returns information about ongoing and completed shard recoveries, similar to the index recovery API.

For data streams, the API returns information about the stream’s backing indices.

Request

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GET /_cat/recovery/<target>

GET /_cat/recovery

Prerequisites

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If the Elasticsearch security features are enabled, you must have the monitor or manage cluster privilege to use this API. You must also have the monitor or manage index privilege for any data stream, index, or alias you retrieve.

Description

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The cat recovery API returns information about shard recoveries, both ongoing and completed. It is a more compact view of the JSON index recovery API.

Shard recovery is the process of initializing a shard copy, such as restoring a primary shard from a snapshot or creating a replica shard from a primary shard. When a shard recovery completes, the recovered shard is available for search and indexing.

Recovery automatically occurs during the following processes:

When creating an index for the first time.
When a node rejoins the cluster and starts up any missing primary shard copies using the data that it holds in its data path.
Creation of new replica shard copies from the primary.
Relocation of a shard copy to a different node in the same cluster.
A snapshot restore operation.
A clone, shrink, or split operation.

You can determine the cause of a shard recovery using the recovery or cat recovery APIs.

Path parameters

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<target>: (Optional, string) Comma-separated list of data streams, indices, and aliases used to limit the request. Supports wildcards (*). To target all data streams and indices, omit this parameter or use * or _all.

Query parameters

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active_only: (Optional, Boolean) If true, the response only includes ongoing shard recoveries. Defaults to false.
bytes: (Optional, byte size units) Unit used to display byte values.
detailed: (Optional, Boolean) If true, the response includes detailed information about shard recoveries. Defaults to false.
format: (Optional, string) Short version of the HTTP accept header. Valid values include JSON, YAML, etc.
h: (Optional, string) Comma-separated list of column names to display.
help: (Optional, Boolean) If true, the response includes help information. Defaults to false.
index: (Optional, string) Comma-separated list or wildcard expression of index names used to limit the request.
s: (Optional, string) Comma-separated list of column names or column aliases used to sort the response.
time: (Optional, time units) Unit used to display time values.
v: (Optional, Boolean) If true, the response includes column headings. Defaults to false.

Examples

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Example with no ongoing recoveries

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response = client.cat.recovery(
  v: true
)
puts response

GET _cat/recovery?v=true

The API returns the following response:

index             shard time type  stage source_host source_node target_host target_node repository snapshot files files_recovered files_percent files_total bytes bytes_recovered bytes_percent bytes_total translog_ops translog_ops_recovered translog_ops_percent
my-index-000001   0     13ms store done  n/a         n/a         127.0.0.1   node-0      n/a        n/a      0     0               100%          13          0b    0b              100%          9928b       0            0                      100.0%

In this example response, the source and target nodes are the same because the recovery type is store, meaning they were read from local storage on node start.

Example with a live shard recovery

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By increasing the replica count of an index and bringing another node online to host the replicas, you can retrieve information about an ongoing recovery.

response = client.cat.recovery(
  v: true,
  h: 'i,s,t,ty,st,shost,thost,f,fp,b,bp'
)
puts response

GET _cat/recovery?v=true&h=i,s,t,ty,st,shost,thost,f,fp,b,bp

The API returns the following response:

i               s t      ty   st    shost       thost       f     fp      b  bp
my-index-000001 0 1252ms peer done  192.168.1.1 192.168.1.2 0     100.0%  0b 100.0%

In this example response, the recovery type is peer, meaning the shard recovered from another node. The returned files and bytes are real-time measurements.

Example with a snapshot recovery

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You can restore backups of an index using the snapshot and restore API. You can use the cat recovery API retrieve information about a snapshot recovery.

response = client.cat.recovery(
  v: true,
  h: 'i,s,t,ty,st,rep,snap,f,fp,b,bp'
)
puts response

GET _cat/recovery?v=true&h=i,s,t,ty,st,rep,snap,f,fp,b,bp

The API returns the following response with a recovery type of snapshot:

i               s t      ty       st    rep     snap   f  fp   b     bp
my-index-000001 0 1978ms snapshot done  my-repo snap-1 79 8.0% 12086 9.0%

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