Task - List Subtasks

Reference

Service:: Batch Service

API Version:: 2024-07-01.20.0

Lists all of the subtasks that are associated with the specified multi-instance Task.
If the Task is not a multi-instance Task then this returns an empty collection.

GET {batchUrl}/jobs/{jobId}/tasks/{taskId}/subtasksinfo?api-version=2024-07-01.20.0

With optional parameters:

GET {batchUrl}/jobs/{jobId}/tasks/{taskId}/subtasksinfo?$select={$select}&timeout={timeout}&api-version=2024-07-01.20.0

URI Parameters

Name	In	Required	Type	Description
batchUrl	path	True	string	The base URL for all Azure Batch service requests.
jobId	path	True	string	The ID of the Job.
taskId	path	True	string	The ID of the Task.
api-version	query	True	string	Client API Version.
$select	query		string	An OData $select clause.
timeout	query		integer int32	The maximum time that the server can spend processing the request, in seconds. The default is 30 seconds. If the value is larger than 30, the default will be used instead.

Request Header

Media Types: "application/json; odata=minimalmetadata"

Name	Required	Type	Description
client-request-id		string uuid	The caller-generated request identity, in the form of a GUID with no decoration such as curly braces, e.g. 9C4D50EE-2D56-4CD3-8152-34347DC9F2B0.
return-client-request-id		boolean	Whether the server should return the client-request-id in the response.
ocp-date		string date-time-rfc1123	The time the request was issued. Client libraries typically set this to the current system clock time; set it explicitly if you are calling the REST API directly.

Responses

Name

Type

Description

200 OK

CloudTaskListSubtasksResult

A response containing the list of subtasks.

Headers

client-request-id: string
request-id: string
ETag: string
Last-Modified: string

Other Status Codes

The error from the Batch service.

Security

azure_auth

Microsoft Entra OAuth 2.0 auth code flow

Type: oauth2
Flow: implicit
Authorization URL: https://login.microsoftonline.com/common/oauth2/authorize

Scopes

Name	Description
user_impersonation	Impersonate your user account

Authorization

Type: apiKey
In: header

Examples

Task list subtasks

Sample request

HTTP

GET account.region.batch.azure.com/jobs/jobId/tasks/taskId/subtasksinfo?api-version=2024-07-01.20.0

Sample response

Status code:: 200

{
  "value": [
    {
      "id": 1,
      "startTime": "2016-09-06T06:59:16.3139271Z",
      "endTime": "2016-09-06T06:59:20.0242024Z",
      "state": "completed",
      "stateTransitionTime": "2016-09-06T06:59:20.0242024Z",
      "previousState": "running",
      "previousStateTransitionTime": "2016-09-06T06:59:16.3139271Z",
      "exitCode": 0,
      "nodeInfo": {
        "affinityId": "TVM:tvm-2544493925_3-20160905t051718z",
        "nodeUrl": "https://account.region.batch.azure.com/pools/poolId/nodes/tvm-2544493925_3-20160905t051718z",
        "poolId": "mpiPool",
        "nodeId": "tvm-2544493925_3-20160905t051718z",
        "taskRootDirectory": "\\workitems\\jobId\\job-1\\taskId\\1",
        "taskRootDirectoryUrl": "https://account.region.batch.azure.com/pools/poolId/nodes/tvm-2544493925_3-20160905t051718z/files//workitems/jobId/job-1/taskId/1"
      }
    },
    {
      "id": 2,
      "startTime": "2016-09-06T06:59:16.9702844Z",
      "state": "running",
      "stateTransitionTime": "2016-09-06T06:59:16.9702844Z",
      "nodeInfo": {
        "affinityId": "TVM:tvm-2544493925_2-20160905t051718z",
        "nodeUrl": "https://account.region.batch.azure.com/pools/poolId/nodes/tvm-2544493925_2-20160905t051718z",
        "poolId": "mpiPool",
        "nodeId": "tvm-2544493925_2-20160905t051718z",
        "taskRootDirectory": "\\workitems\\jobId\\job-1\\taskId\\2",
        "taskRootDirectoryUrl": "https://account.region.batch.azure.com/pools/poolId/nodes/tvm-2544493925_2-20160905t051718z/files//workitems/jobId/job-1/taskId/2"
      }
    }
  ]
}

Definitions

Name	Description
BatchError	An error response received from the Azure Batch service.
BatchErrorDetail	An item of additional information included in an Azure Batch error response.
CloudTaskListSubtasksResult	The result of listing the subtasks of a Task.
ComputeNodeInformation	Information about the Compute Node on which a Task ran.
ErrorCategory	The category of the error.
ErrorMessage	An error message received in an Azure Batch error response.
NameValuePair	Represents a name-value pair.
SubtaskInformation	Information about an Azure Batch subtask.
SubtaskState	The state of the subtask.
TaskContainerExecutionInformation	Contains information about the container which a Task is executing.
TaskExecutionResult	The result of Task execution.
TaskFailureInformation	Information about a Task failure.

BatchError

An error response received from the Azure Batch service.

Name	Type	Description
code	string	An identifier for the error. Codes are invariant and are intended to be consumed programmatically.
message	ErrorMessage	A message describing the error, intended to be suitable for display in a user interface.
values	BatchErrorDetail[]	A collection of key-value pairs containing additional details about the error.

BatchErrorDetail

An item of additional information included in an Azure Batch error response.

Name	Type	Description
key	string	An identifier specifying the meaning of the Value property.
value	string	The additional information included with the error response.

CloudTaskListSubtasksResult

The result of listing the subtasks of a Task.

Name	Type	Description
value	SubtaskInformation[]	The list of subtasks.

ComputeNodeInformation

Information about the Compute Node on which a Task ran.

Name	Type	Description
affinityId	string	An identifier for the Node on which the Task ran, which can be passed when adding a Task to request that the Task be scheduled on this Compute Node.
nodeId	string	The ID of the Compute Node on which the Task ran.
nodeUrl	string	The URL of the Compute Node on which the Task ran.
poolId	string	The ID of the Pool on which the Task ran.
taskRootDirectory	string	The root directory of the Task on the Compute Node.
taskRootDirectoryUrl	string	The URL to the root directory of the Task on the Compute Node.

ErrorCategory

The category of the error.

Name	Type	Description
servererror	string	The error is due to an internal server issue.
usererror	string	The error is due to a user issue, such as misconfiguration.

ErrorMessage

An error message received in an Azure Batch error response.

Name	Type	Description
lang	string	The language code of the error message
value	string	The text of the message.

NameValuePair

Represents a name-value pair.

Name	Type	Description
name	string	The name in the name-value pair.
value	string	The value in the name-value pair.

SubtaskInformation

Information about an Azure Batch subtask.

Name	Type	Description
containerInfo	TaskContainerExecutionInformation	Information about the container under which the Task is executing. This property is set only if the Task runs in a container context.
endTime	string	The time at which the subtask completed. This property is set only if the subtask is in the Completed state.
exitCode	integer	The exit code of the program specified on the subtask command line. This property is set only if the subtask is in the completed state. In general, the exit code for a process reflects the specific convention implemented by the application developer for that process. If you use the exit code value to make decisions in your code, be sure that you know the exit code convention used by the application process. However, if the Batch service terminates the subtask (due to timeout, or user termination via the API) you may see an operating system-defined exit code.
failureInfo	TaskFailureInformation	Information describing the Task failure, if any. This property is set only if the Task is in the completed state and encountered a failure.
id	integer	The ID of the subtask.
nodeInfo	ComputeNodeInformation	Information about the Compute Node on which the subtask ran.
previousState	SubtaskState	The previous state of the subtask. This property is not set if the subtask is in its initial running state.
previousStateTransitionTime	string	The time at which the subtask entered its previous state. This property is not set if the subtask is in its initial running state.
result	TaskExecutionResult	The result of the Task execution. If the value is 'failed', then the details of the failure can be found in the failureInfo property.
startTime	string	The time at which the subtask started running. If the subtask has been restarted or retried, this is the most recent time at which the subtask started running.
state	SubtaskState	The current state of the subtask.
stateTransitionTime	string	The time at which the subtask entered its current state.

SubtaskState

The state of the subtask.

Name	Type	Description
completed	string	The Task is no longer eligible to run, usually because the Task has finished successfully, or the Task has finished unsuccessfully and has exhausted its retry limit. A Task is also marked as completed if an error occurred launching the Task, or when the Task has been terminated.
preparing	string	The Task has been assigned to a Compute Node, but is waiting for a required Job Preparation Task to complete on the Compute Node. If the Job Preparation Task succeeds, the Task will move to running. If the Job Preparation Task fails, the Task will return to active and will be eligible to be assigned to a different Compute Node.
running	string	The Task is running on a Compute Node. This includes task-level preparation such as downloading resource files or deploying Packages specified on the Task - it does not necessarily mean that the Task command line has started executing.

TaskContainerExecutionInformation

Contains information about the container which a Task is executing.

Name	Type	Description
containerId	string	The ID of the container.
error	string	Detailed error information about the container. This is the detailed error string from the Docker service, if available. It is equivalent to the error field returned by "docker inspect".
state	string	The state of the container. This is the state of the container according to the Docker service. It is equivalent to the status field returned by "docker inspect".

TaskExecutionResult

The result of Task execution.

Name	Type	Description
failure	string	There was an error during processing of the Task. The failure may have occurred before the Task process was launched, while the Task process was executing, or after the Task process exited.
success	string	The Task ran successfully.

TaskFailureInformation

Information about a Task failure.

Name	Type	Description
category	ErrorCategory	The category of the Task error.
code	string	An identifier for the Task error. Codes are invariant and are intended to be consumed programmatically.
details	NameValuePair[]	A list of additional details related to the error.
message	string	A message describing the Task error, intended to be suitable for display in a user interface.