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- Elasticsearch version 8.10.4
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- Dependencies and versions
Task management API
editTask management API
editThe task management API is new and should still be considered a beta feature. The API may change in ways that are not backwards compatible. For feature status, see #51628.
Returns information about the tasks currently executing in the cluster.
Prerequisites
edit-
If the Elasticsearch security features are enabled, you must have the
monitor
ormanage
cluster privilege to use this API.
Description
editThe task management API returns information about tasks currently executing on one or more nodes in the cluster.
Path parameters
edit-
<task_id>
-
(Optional, string) ID of the task to return
(
node_id:task_number
).
Query parameters
edit-
actions
-
(Optional, string) Comma-separated list or wildcard expression of actions used to limit the request.
Omit this parameter to return all actions.
-
detailed
-
(Optional, Boolean)
If
true
, the response includes detailed information about shard recoveries. Defaults tofalse
. -
group_by
-
(Optional, string) Key used to group tasks in the response.
Possible values are:
-
nodes
- (Default) Node ID
-
parents
- Parent task ID
-
none
- Do not group tasks.
-
-
nodes
- (Optional, string) Comma-separated list of node IDs or names used to limit returned information.
-
parent_task_id
-
(Optional, string) Parent task ID used to limit returned information.
To return all tasks, omit this parameter or use a value of
-1
. -
master_timeout
-
(Optional, time units)
Period to wait for a connection to the master node. If no response is received
before the timeout expires, the request fails and returns an error. Defaults to
30s
. -
timeout
-
(Optional, time units)
Period to wait for a response. If no response is received before the timeout
expires, the request fails and returns an error. Defaults to
30s
. -
wait_for_completion
-
(Optional, Boolean) If
true
, the request blocks until all found tasks are complete. Defaults tofalse
.
Response codes
edit-
404
(Missing resources) -
If
<task_id>
is specified but not found, this code indicates that there are no resources that match the request.
Examples
editresponse = client.tasks.list puts response response = client.tasks.list( nodes: 'nodeId1,nodeId2' ) puts response response = client.tasks.list( nodes: 'nodeId1,nodeId2', actions: 'cluster:*' ) puts response
Retrieves all tasks currently running on all nodes in the cluster. |
|
Retrieves all tasks running on nodes |
|
Retrieves all cluster-related tasks running on nodes |
The API returns the following result:
{ "nodes" : { "oTUltX4IQMOUUVeiohTt8A" : { "name" : "H5dfFeA", "transport_address" : "127.0.0.1:9300", "host" : "127.0.0.1", "ip" : "127.0.0.1:9300", "tasks" : { "oTUltX4IQMOUUVeiohTt8A:124" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 124, "type" : "direct", "action" : "cluster:monitor/tasks/lists[n]", "start_time_in_millis" : 1458585884904, "running_time_in_nanos" : 47402, "cancellable" : false, "parent_task_id" : "oTUltX4IQMOUUVeiohTt8A:123" }, "oTUltX4IQMOUUVeiohTt8A:123" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 123, "type" : "transport", "action" : "cluster:monitor/tasks/lists", "start_time_in_millis" : 1458585884904, "running_time_in_nanos" : 236042, "cancellable" : false } } } } }
Retrieve information from a particular task
editIt is also possible to retrieve information for a particular task. The following
example retrieves information about task oTUltX4IQMOUUVeiohTt8A:124
:
response = client.tasks.get( task_id: 'oTUltX4IQMOUUVeiohTt8A:124' ) puts response
GET _tasks/oTUltX4IQMOUUVeiohTt8A:124
If the task isn’t found, the API returns a 404.
To retrieve all children of a particular task:
response = client.tasks.list( parent_task_id: 'oTUltX4IQMOUUVeiohTt8A:123' ) puts response
GET _tasks?parent_task_id=oTUltX4IQMOUUVeiohTt8A:123
If the parent isn’t found, the API does not return a 404.
Get more information about tasks
editYou can also use the detailed
request parameter to get more information about
the running tasks. This is useful to distinguish tasks from each other but
is more costly to execute. For example, fetching all searches using the detailed
request parameter:
response = client.tasks.list( actions: '*search', detailed: true ) puts response
GET _tasks?actions=*search&detailed
The API returns the following result:
{ "nodes" : { "oTUltX4IQMOUUVeiohTt8A" : { "name" : "H5dfFeA", "transport_address" : "127.0.0.1:9300", "host" : "127.0.0.1", "ip" : "127.0.0.1:9300", "tasks" : { "oTUltX4IQMOUUVeiohTt8A:464" : { "node" : "oTUltX4IQMOUUVeiohTt8A", "id" : 464, "type" : "transport", "action" : "indices:data/read/search", "description" : "indices[test], types[test], search_type[QUERY_THEN_FETCH], source[{\"query\":...}]", "start_time_in_millis" : 1483478610008, "running_time_in_nanos" : 13991383, "cancellable" : true, "cancelled" : false } } } } }
The new description
field contains human readable text that identifies the
particular request that the task is performing such as identifying the search
request being performed by a search task like the example above. Other kinds of
tasks have different descriptions, like _reindex
which
has the source and the destination, or _bulk
which just has the
number of requests and the destination indices. Many requests will only have an
empty description because more detailed information about the request is not
easily available or particularly helpful in identifying the request.
_tasks
requests with detailed
may also return a status
. This is a report
of the internal status of the task. As such its format varies from task to task.
While we try to keep the status
for a particular task consistent from version
to version this isn’t always possible because we sometimes change the
implementation. In that case we might remove fields from the status
for a
particular request so any parsing you do of the status might break in minor
releases.
Wait for completion
editThe task API can also be used to wait for completion of a particular task. The
following call will block for 10 seconds or until the task with id
oTUltX4IQMOUUVeiohTt8A:12345
is completed.
response = client.tasks.get( task_id: 'oTUltX4IQMOUUVeiohTt8A:12345', wait_for_completion: true, timeout: '10s' ) puts response
GET _tasks/oTUltX4IQMOUUVeiohTt8A:12345?wait_for_completion=true&timeout=10s
You can also wait for all tasks for certain action types to finish. This command
will wait for all reindex
tasks to finish:
response = client.tasks.list( actions: '*reindex', wait_for_completion: true, timeout: '10s' ) puts response
GET _tasks?actions=*reindex&wait_for_completion=true&timeout=10s
Task Cancellation
editIf a long-running task supports cancellation, it can be cancelled with the cancel
tasks API. The following example cancels task oTUltX4IQMOUUVeiohTt8A:12345
:
response = client.tasks.cancel( task_id: 'oTUltX4IQMOUUVeiohTt8A:12345' ) puts response
POST _tasks/oTUltX4IQMOUUVeiohTt8A:12345/_cancel
The task cancellation command supports the same task selection parameters as the
list tasks command, so multiple tasks can be cancelled at the same time. For
example, the following command will cancel all reindex tasks running on the
nodes nodeId1
and nodeId2
.
response = client.tasks.cancel( nodes: 'nodeId1,nodeId2', actions: '*reindex' ) puts response
POST _tasks/_cancel?nodes=nodeId1,nodeId2&actions=*reindex
A task may continue to run for some time after it has been cancelled because it
may not be able to safely stop its current activity straight away, or because
Elasticsearch must complete its work on other tasks before it can process the
cancellation. The list tasks API will continue to list these cancelled tasks
until they complete. The cancelled
flag in the response to the list tasks API
indicates that the cancellation command has been processed and the task will
stop as soon as possible. To troubleshoot why a cancelled task does not
complete promptly, use the list tasks API with the ?detailed
parameter to
identify the other tasks the system is running and also use the
Nodes hot threads API to obtain detailed information about the work
the system is doing instead of completing the cancelled task.
Task Grouping
editThe task lists returned by task API commands can be grouped either by nodes
(default) or by parent tasks using the group_by
parameter. The following
command will change the grouping to parent tasks:
response = client.tasks.list( group_by: 'parents' ) puts response
GET _tasks?group_by=parents
The grouping can be disabled by specifying none
as a group_by
parameter:
response = client.tasks.list( group_by: 'none' ) puts response
GET _tasks?group_by=none
Identifying running tasks
editThe X-Opaque-Id
header, when provided on the HTTP request header, is going to
be returned as a header in the response as well as in the headers
field for in
the task information. This allows to track certain calls, or associate certain
tasks with the client that started them:
curl -i -H "X-Opaque-Id: 123456" "http://localhost:9200/_tasks?group_by=parents"
The API returns the following result:
HTTP/1.1 200 OK X-Opaque-Id: 123456 content-type: application/json; charset=UTF-8 content-length: 831 { "tasks" : { "u5lcZHqcQhu-rUoFaqDphA:45" : { "node" : "u5lcZHqcQhu-rUoFaqDphA", "id" : 45, "type" : "transport", "action" : "cluster:monitor/tasks/lists", "start_time_in_millis" : 1513823752749, "running_time_in_nanos" : 293139, "cancellable" : false, "headers" : { "X-Opaque-Id" : "123456" }, "children" : [ { "node" : "u5lcZHqcQhu-rUoFaqDphA", "id" : 46, "type" : "direct", "action" : "cluster:monitor/tasks/lists[n]", "start_time_in_millis" : 1513823752750, "running_time_in_nanos" : 92133, "cancellable" : false, "parent_task_id" : "u5lcZHqcQhu-rUoFaqDphA:45", "headers" : { "X-Opaque-Id" : "123456" } } ] } } }
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