OpenSearch/docs/reference/cluster/pending.asciidoc

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[[cluster-pending]]
=== Pending cluster tasks API
++++
<titleabbrev>Pending cluster tasks</titleabbrev>
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Returns cluster-level changes that have not yet been executed.
[[cluster-pending-api-request]]
==== {api-request-title}
`GET /_cluster/pending_tasks`
[[cluster-pending-api-desc]]
==== {api-description-title}
The pending cluster tasks API returns a list of any cluster-level changes (e.g.
create index, update mapping, allocate or fail shard) which have not yet been
executed.
NOTE: This API returns a list of any pending updates to the cluster state. These are distinct from the tasks reported by the
<<tasks,Task Management API>> which include periodic tasks and tasks initiated by the user, such as node stats, search queries, or create
index requests. However, if a user-initiated task such as a create index command causes a cluster state update, the activity of this task
might be reported by both task api and pending cluster tasks API.
[[cluster-pending-api-path-params]]
==== {api-path-parms-title}
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=local]
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=master-timeout]
[[cluster-pending-api-response-body]]
==== {api-response-body-title}
`tasks`::
(object) A list of pending tasks.
`insert_order`::
(integer) The number that represents when the task has been inserted into
the task queue.
`priority`::
(string) The priority of the pending task.
`source`::
(string) A general description of the cluster task that may include a reason
and origin.
`time_in_queue_millis`::
(integer) The time expressed in milliseconds since the task is waiting for
being performed.
`time_in_queue`::
(string) The time since the task is waiting for being performed.
[[cluster-pending-api-example]]
==== {api-examples-title}
Usually the request will return an empty list as cluster-level changes are fast.
However, if there are tasks queued up, the response will look similar like this:
[source,js]
--------------------------------------------------
{
"tasks": [
{
"insert_order": 101,
"priority": "URGENT",
"source": "create-index [foo_9], cause [api]",
"time_in_queue_millis": 86,
"time_in_queue": "86ms"
},
{
"insert_order": 46,
"priority": "HIGH",
"source": "shard-started ([foo_2][1], node[tMTocMvQQgGCkj7QDHl3OA], [P], s[INITIALIZING]), reason [after recovery from shard_store]",
"time_in_queue_millis": 842,
"time_in_queue": "842ms"
},
{
"insert_order": 45,
"priority": "HIGH",
"source": "shard-started ([foo_2][0], node[tMTocMvQQgGCkj7QDHl3OA], [P], s[INITIALIZING]), reason [after recovery from shard_store]",
"time_in_queue_millis": 858,
"time_in_queue": "858ms"
}
]
}
--------------------------------------------------
// NOTCONSOLE
// We can't test tasks output