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Task schedule fail event

  • Άρθρο

This event is emitted when a task failed to be scheduled and will be retried later. This is a temporary failure at task scheduling time due to resource limitation, for example not enough slots available on nodes to run a task with requiredSlots specified.

The following example shows the body of a task schedule fail event.

{
    "jobId": "job-01",
    "id": "task-01",
    "taskType": "User",
    "systemTaskVersion": 665378862,
    "requiredSlots": 1,
    "nodeInfo": {
        "poolId": "pool-01",
        "nodeId": " "
    },
    "multiInstanceSettings": {
        "numberOfInstances": 1
    },
    "constraints": {
        "maxTaskRetryCount": 0
    },
    "schedulingError": {
        "category": "UserError",
        "code": "JobPreparationTaskFailed",
        "message": "Task cannot run because the job preparation task failed on node"
    }
}
Element name Type Notes
jobId String The ID of the job containing the task.
id String The ID of the task.
taskType String The type of the task. This can either be 'JobManager' indicating it is a job manager task or 'User' indicating it is not a job manager task. This event is not emitted for job preparation tasks, job release tasks or start tasks.
systemTaskVersion Int32 This is the internal retry counter on a task. Internally the Batch service can retry a task to account for transient issues. These issues can include internal scheduling errors or attempts to recover from compute nodes in a bad state.
requiredSlots Int32 The required slots to run the task.
nodeInfo Complex Type Contains information about the compute node on which the task ran.
multiInstanceSettings Complex Type Specifies that the task is a Multi-Instance Task requiring multiple compute nodes. See multiInstanceSettings for details.
constraints Complex Type The execution constraints that apply to this task.
schedulingError Complex Type Contains information about the scheduling error of the task.

nodeInfo

Element name Type Notes
poolId String The ID of the pool on which the task ran.
nodeId String The ID of the node on which the task ran.

multiInstanceSettings

Element name Type Notes
numberOfInstances Int32 The number of compute nodes required by the task.

constraints

Element name Type Notes
maxTaskRetryCount Int32 The maximum number of times the task may be retried. The Batch service retries a task if its exit code is nonzero.

Note that this value specifically controls the number of retries. The Batch service will try the task once, and may then retry up to this limit. For example, if the maximum retry count is 3, Batch tries a task up to 4 times (one initial try and 3 retries).

If the maximum retry count is 0, the Batch service does not retry tasks.

If the maximum retry count is -1, the Batch service retries tasks without limit.

The default value is 0 (no retries).

schedulingError

Element name Type Notes
category String The category of the error.
code String An identifier for the task scheduling error. Codes are invariant and are intended to be consumed programmatically.
message String A message describing the task scheduling error, intended to be suitable for display in a user interface.