392 lines
10 KiB
Markdown
392 lines
10 KiB
Markdown
---
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layout: default
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title: API
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nav_order: 50
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---
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# Cross-cluster replication API
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Use these replication operations to programmatically manage cross-cluster replication.
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#### Table of contents
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- TOC
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{:toc}
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## Start replication
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Introduced 1.1
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{: .label .label-purple }
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Initiate replication of an index from the leader cluster to the follower cluster. Send this request to the follower cluster.
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#### Request
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```json
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PUT /_plugins/_replication/<follower-index>/_start
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{
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"leader_alias":"<connection-alias-name>",
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"leader_index":"<index-name>",
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"use_roles":{
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"leader_cluster_role":"<role-name>",
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"follower_cluster_role":"<role-name>"
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}
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}
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```
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Specify the following options:
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Options | Description | Type | Required
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:--- | :--- |:--- |:--- |
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`leader_alias` | The name of the cross-cluster connection. You define this alias when you [set up a cross-cluster connection]({{site.url}}{{site.baseurl}}/replication-plugin/get-started/#set-up-a-cross-cluster-connection). | `string` | Yes
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`leader_index` | The index on the leader cluster that you want to replicate. | `string` | Yes
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`use_roles` | The roles to use for all subsequent backend replication tasks between the indices. Specify a `leader_cluster_role` and `follower_cluster_role`. See [Map the leader and follower cluster roles]({{site.url}}{{site.baseurl}}/replication-plugin/permissions/#map-the-leader-and-follower-cluster-roles). | `string` | If security plugin is enabled
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Stop replication
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Introduced 1.1
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{: .label .label-purple }
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Terminates replication and converts the follower index to a standard index. Send this request to the follower cluster.
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#### Request
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```json
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POST /_plugins/_replication/<follower-index>/_stop
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{}
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```
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Pause replication
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Introduced 1.1
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{: .label .label-purple }
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Pauses replication of the leader index. Send this request to the follower cluster.
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#### Request
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```json
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POST /_plugins/_replication/<follower-index>/_pause
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{}
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```
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You can't resume replication after it's been paused for more than 12 hours. You must [stop replication]({{site.url}}{{site.baseurl}}/replication-plugin/api/#stop-replication), delete the follower index, and restart replication of the leader.
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Resume replication
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Introduced 1.1
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{: .label .label-purple }
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Resumes replication of the leader index. Send this request to the follower cluster.
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#### Request
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```json
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POST /_plugins/_replication/<follower-index>/_resume
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{}
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```
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Get replication status
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Introduced 1.1
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{: .label .label-purple }
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Gets the status of index replication. Possible statuses are `SYNCING`, `BOOTSTRAPING`, `PAUSED`, and `REPLICATION NOT IN PROGRESS`. Use the syncing details to measure replication lag. Send this request to the follower cluster.
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#### Request
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```json
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GET /_plugins/_replication/<follower-index>/_status
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```
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#### Sample response
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```json
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{
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"status" : "SYNCING",
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"reason" : "User initiated",
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"leader_alias" : "my-connection-name",
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"leader_index" : "leader-01",
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"follower_index" : "follower-01",
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"syncing_details" : {
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"leader_checkpoint" : 19,
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"follower_checkpoint" : 19,
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"seq_no" : 0
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}
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}
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```
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To include shard replication details in the response, add the `&verbose=true` parameter.
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The leader and follower checkpoint values begin as negative integers and reflect the shard count (-1 for one shard, -5 for five shards, and so on). The values increment toward positive integers with each change that you make. For example, when you make a change on the leader index, the `leader_checkpoint` becomes `0`. The `follower_checkpoint` is initially still `-1` until the follower index pulls the change from the leader, at which point it increments to `0`. If the values are the same, it means the indices are fully synced.
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## Get leader cluster stats
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Introduced 1.1
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{: .label .label-purple }
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Gets information about replicated leader indices on a specified cluster.
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#### Request
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```json
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GET /_plugins/_replication/leader_stats
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```
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#### Sample response
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```json
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{
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"num_replicated_indices": 2,
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"operations_read": 15,
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"translog_size_bytes": 1355,
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"operations_read_lucene": 0,
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"operations_read_translog": 15,
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"total_read_time_lucene_millis": 0,
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"total_read_time_translog_millis": 659,
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"bytes_read": 1000,
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"index_stats":{
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"leader-index-1":{
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"operations_read": 7,
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"translog_size_bytes": 639,
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"operations_read_lucene": 0,
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"operations_read_translog": 7,
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"total_read_time_lucene_millis": 0,
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"total_read_time_translog_millis": 353,
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"bytes_read":466
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},
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"leader-index-2":{
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"operations_read": 8,
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"translog_size_bytes": 716,
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"operations_read_lucene": 0,
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"operations_read_translog": 8,
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"total_read_time_lucene_millis": 0,
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"total_read_time_translog_millis": 306,
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"bytes_read": 534
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}
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}
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}
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```
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## Get follower cluster stats
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Introduced 1.1
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{: .label .label-purple }
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Gets information about follower (syncing) indices on a specified cluster.
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#### Request
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```json
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GET /_plugins/_replication/follower_stats
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```
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#### Sample response
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```json
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{
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"num_syncing_indices": 2,
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"num_bootstrapping_indices": 0,
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"num_paused_indices": 0,
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"num_failed_indices": 0,
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"num_shard_tasks": 2,
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"num_index_tasks": 2,
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"operations_written": 3,
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"operations_read": 3,
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"failed_read_requests": 0,
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"throttled_read_requests": 0,
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"failed_write_requests": 0,
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"throttled_write_requests": 0,
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"follower_checkpoint": 1,
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"leader_checkpoint": 1,
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"total_write_time_millis": 2290,
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"index_stats":{
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"follower-index-1":{
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"operations_written": 2,
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"operations_read": 2,
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"failed_read_requests": 0,
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"throttled_read_requests": 0,
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"failed_write_requests": 0,
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"throttled_write_requests": 0,
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"follower_checkpoint": 1,
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"leader_checkpoint": 1,
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"total_write_time_millis": 1355
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},
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"follower-index-2":{
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"operations_written": 1,
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"operations_read": 1,
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"failed_read_requests": 0,
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"throttled_read_requests": 0,
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"failed_write_requests": 0,
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"throttled_write_requests": 0,
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"follower_checkpoint": 0,
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"leader_checkpoint": 0,
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"total_write_time_millis": 935
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}
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}
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}
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```
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## Get auto-follow stats
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Introduced 1.1
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{: .label .label-purple }
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Gets information about auto-follow activity and any replication rules configured on the specified cluster.
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#### Request
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```json
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GET /_plugins/_replication/autofollow_stats
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```
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#### Sample response
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```json
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{
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"num_success_start_replication": 2,
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"num_failed_start_replication": 0,
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"num_failed_leader_calls": 0,
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"failed_indices":[
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],
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"autofollow_stats":[
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{
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"name":"my-replication-rule",
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"pattern":"movies*",
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"num_success_start_replication": 2,
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"num_failed_start_replication": 0,
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"num_failed_leader_calls": 0,
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"failed_indices":[
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]
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}
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]
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}
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```
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## Update settings
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Introduced 1.1
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{: .label .label-purple }
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Updates settings on the follower index.
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#### Request
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```json
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PUT /_plugins/_replication/<follower-index>/_update
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{
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"settings":{
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"index.number_of_shards": 4,
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"index.number_of_replicas": 2
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}
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}
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```
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Create replication rule
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Introduced 1.1
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{: .label .label-purple }
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Automatically starts replication on indices matching a specified pattern. If a new index on the leader cluster matches the pattern, OpenSearch automatically creates a follower index and begins replication. You can also use this API to update existing replication rules.
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Send this request to the follower cluster.
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Make sure to note the names of all auto-follow patterns after you create them. The replication plugin currently does not include an API operation to retrieve a list of existing patterns.
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{: .tip }
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#### Request
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```json
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POST /_plugins/_replication/_autofollow
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{
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"leader_alias" : "<connection-alias-name>",
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"name": "<auto-follow-pattern-name>",
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"pattern": "<pattern>",
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"use_roles":{
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"leader_cluster_role": "<role-name>",
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"follower_cluster_role": "<role-name>"
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}
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}
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```
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Specify the following options:
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Options | Description | Type | Required
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:--- | :--- |:--- |:--- |
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`leader_alias` | The name of the cross-cluster connection. You define this alias when you [set up a cross-cluster connection]({{site.url}}{{site.baseurl}}/replication-plugin/get-started/#set-up-a-cross-cluster-connection). | `string` | Yes
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`name` | A name for the auto-follow pattern. | `string` | Yes
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`pattern` | An array of index patterns to match against indices in the specified leader cluster. Supports wildcard characters. For example, `leader-*`. | `string` | Yes
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`use_roles` | The roles to use for all subsequent backend replication tasks between the indices. Specify a `leader_cluster_role` and `follower_cluster_role`. See [Map the leader and follower cluster roles]({{site.url}}{{site.baseurl}}/replication-plugin/permissions/#map-the-leader-and-follower-cluster-roles). | `string` | If security plugin is enabled
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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## Delete replication rule
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Introduced 1.1
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{: .label .label-purple }
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Deletes the specified replication rule. This operation prevents any new indices from being replicated but does not stop existing replication that the rule has already initiated. Replicated indices remain read-only until you stop replication.
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Send this request to the follower cluster.
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#### Request
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```json
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DELETE /_plugins/_replication/_autofollow
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{
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"leader_alias" : "<connection-alias-name>",
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"name": "<auto-follow-pattern-name>",
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}
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```
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Specify the following options:
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Options | Description | Type | Required
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:--- | :--- |:--- |:--- |
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`leader_alias` | The name of the cross-cluster connection. You define this alias when you [set up a cross-cluster connection]({{site.url}}{{site.baseurl}}/replication-plugin/get-started/#set-up-a-cross-cluster-connection). | `string` | Yes
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`name` | The name of the pattern. | `string` | Yes
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#### Sample response
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```json
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{
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"acknowledged": true
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}
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```
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