Tasks - List Sub Tasks

Service:: Batch Service

API Version:: 2025-06-01

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 {endpoint}/jobs/{jobId}/tasks/{taskId}/subtasksinfo?api-version=2025-06-01

With optional parameters:

GET {endpoint}/jobs/{jobId}/tasks/{taskId}/subtasksinfo?api-version=2025-06-01&timeOut={timeOut}&$select={$select}

URI Parameters

Name	In	Required	Type	Description
endpoint	path	True	string (uri)	Batch account endpoint (for example: https://batchaccount.eastus2.batch.azure.com).
jobId	path	True	string	The ID of the Job.
taskId	path	True	string	The ID of the Task.
api-version	query	True	string minLength: 1	The API version to use for this operation.
$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

Name	Type	Description
client-request-id	string	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-rfc7231)	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	BatchTaskListSubtasksResult	The request has succeeded. Headers ETag: string Last-Modified: string client-request-id: string request-id: string
Other Status Codes	BatchError	An unexpected error response.

Name

Type

Description

200 OK

BatchTaskListSubtasksResult

The request has succeeded.

Headers

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

Other Status Codes

BatchError

An unexpected error response.

Security

OAuth2Auth

Type: oauth2
Flow: implicit
Authorization URL: https://login.microsoftonline.com/common/oauth2/v2.0/authorize

Scopes

Name	Description
https://batch.core.windows.net//.default

Examples

Task list subtasks

Sample request

HTTP

GET {endpoint}/jobs/jobId/tasks/taskId/subtasksinfo?api-version=2025-06-01

Sample response

Status code:: 200

{
  "value": [
    {
      "id": 1,
      "startTime": "2025-09-06T06:59:16.3139271Z",
      "endTime": "2025-09-06T06:59:20.0242024Z",
      "state": "completed",
      "stateTransitionTime": "2025-09-06T06:59:20.0242024Z",
      "previousState": "running",
      "previousStateTransitionTime": "2025-09-06T06:59:16.3139271Z",
      "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": "2025-09-06T06:59:16.9702844Z",
      "state": "running",
      "stateTransitionTime": "2025-09-06T06:59:16.9702844Z",
      "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.
BatchErrorMessage	An error message received in an Azure Batch error response.
BatchErrorSourceCategory	BatchErrorSourceCategory enums
BatchNodeInfo	Information about the Compute Node on which a Task ran.
BatchSubtask	Information about an Azure Batch subtask.
BatchSubtaskState	BatchSubtaskState enums
BatchTaskContainerExecutionInfo	Contains information about the container which a Task is executing.
BatchTaskExecutionResult	BatchTaskExecutionResult enums
BatchTaskFailureInfo	Information about a Task failure.
BatchTaskListSubtasksResult	The result of listing the subtasks of a Task.
NameValuePair	Represents a name-value pair.

BatchError

Object

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	BatchErrorMessage	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

Object

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.

BatchErrorMessage

Object

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.

BatchErrorSourceCategory

Enumeration

BatchErrorSourceCategory enums

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

BatchNodeInfo

Object

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 (uri)	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 (uri)	The URL to the root directory of the Task on the Compute Node.

BatchSubtask

Object

Information about an Azure Batch subtask.

Name	Type	Description
containerInfo	BatchTaskContainerExecutionInfo	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 (date-time)	The time at which the subtask completed. This property is set only if the subtask is in the Completed state.
exitCode	integer (int32)	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	BatchTaskFailureInfo	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 (int32)	The ID of the subtask.
nodeInfo	BatchNodeInfo	Information about the Compute Node on which the subtask ran.
previousState	BatchSubtaskState	The previous state of the subtask. This property is not set if the subtask is in its initial running state.
previousStateTransitionTime	string (date-time)	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	BatchTaskExecutionResult	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 (date-time)	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	BatchSubtaskState	The current state of the subtask.
stateTransitionTime	string (date-time)	The time at which the subtask entered its current state.

BatchSubtaskState

Enumeration

BatchSubtaskState enums

Value	Description
preparing	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	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.
completed	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.

BatchTaskContainerExecutionInfo

Object

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".

BatchTaskExecutionResult

Enumeration

BatchTaskExecutionResult enums

Value	Description
success	The Task ran successfully.
failure	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.

BatchTaskFailureInfo

Object

Information about a Task failure.

Name	Type	Description
category	BatchErrorSourceCategory	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.

BatchTaskListSubtasksResult

Object

The result of listing the subtasks of a Task.

Name	Type	Description
odata.nextLink	string (uri)	The URL to get the next set of results.
value	BatchSubtask[]	The list of subtasks.

NameValuePair

Object

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.

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Tasks - List Sub Tasks

URI Parameters

Request Header

Responses

Security

OAuth2Auth

Scopes

Examples

Task list subtasks

Sample request

Sample response

Definitions

BatchError

BatchErrorDetail

BatchErrorMessage

BatchErrorSourceCategory

BatchNodeInfo

BatchSubtask

BatchSubtaskState

BatchTaskContainerExecutionInfo

BatchTaskExecutionResult

BatchTaskFailureInfo

BatchTaskListSubtasksResult

NameValuePair