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Source code for dagster_k8s.ops.k8s_job_op

import time
from typing import Any, Dict, List, Optional

import kubernetes.config
import kubernetes.watch
from dagster import Field, In, Noneable, Nothing, OpExecutionContext, Permissive, StringSource, op
from dagster._annotations import experimental
from dagster._utils.merger import merge_dicts

from ..client import DEFAULT_JOB_POD_COUNT, DagsterKubernetesClient
from ..container_context import K8sContainerContext
from ..job import DagsterK8sJobConfig, construct_dagster_k8s_job, get_k8s_job_name
from ..launcher import K8sRunLauncher

K8S_JOB_OP_CONFIG = merge_dicts(
    DagsterK8sJobConfig.config_type_container(),
    {
        "image": Field(
            StringSource,
            is_required=True,
            description="The image in which to launch the k8s job.",
        ),
        "command": Field(
            [str],
            is_required=False,
            description="The command to run in the container within the launched k8s job.",
        ),
        "args": Field(
            [str],
            is_required=False,
            description="The args for the command for the container.",
        ),
        "namespace": Field(StringSource, is_required=False),
        "load_incluster_config": Field(
            bool,
            is_required=False,
            default_value=True,
            description="""Set this value if you are running the launcher
            within a k8s cluster. If ``True``, we assume the launcher is running within the target
            cluster and load config using ``kubernetes.config.load_incluster_config``. Otherwise,
            we will use the k8s config specified in ``kubeconfig_file`` (using
            ``kubernetes.config.load_kube_config``) or fall back to the default kubeconfig.""",
        ),
        "kubeconfig_file": Field(
            Noneable(str),
            is_required=False,
            default_value=None,
            description=(
                "The kubeconfig file from which to load config. Defaults to using the default"
                " kubeconfig."
            ),
        ),
        "timeout": Field(
            int,
            is_required=False,
            description="How long to wait for the job to succeed before raising an exception",
        ),
        "container_config": Field(
            Permissive(),
            is_required=False,
            description=(
                "Raw k8s config for the k8s pod's main container"
                " (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#container-v1-core)."
                " Keys can either snake_case or camelCase."
            ),
        ),
        "pod_template_spec_metadata": Field(
            Permissive(),
            is_required=False,
            description=(
                "Raw k8s config for the k8s pod's metadata"
                " (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#objectmeta-v1-meta)."
                " Keys can either snake_case or camelCase."
            ),
        ),
        "pod_spec_config": Field(
            Permissive(),
            is_required=False,
            description=(
                "Raw k8s config for the k8s pod's pod spec"
                " (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#podspec-v1-core)."
                " Keys can either snake_case or camelCase."
            ),
        ),
        "job_metadata": Field(
            Permissive(),
            is_required=False,
            description=(
                "Raw k8s config for the k8s job's metadata"
                " (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#objectmeta-v1-meta)."
                " Keys can either snake_case or camelCase."
            ),
        ),
        "job_spec_config": Field(
            Permissive(),
            is_required=False,
            description=(
                "Raw k8s config for the k8s job's job spec"
                " (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#jobspec-v1-batch)."
                " Keys can either snake_case or camelCase."
            ),
        ),
    },
)


[docs]@experimental def execute_k8s_job( context: OpExecutionContext, image: str, command: Optional[List[str]] = None, args: Optional[List[str]] = None, namespace: Optional[str] = None, image_pull_policy: Optional[str] = None, image_pull_secrets: Optional[List[Dict[str, str]]] = None, service_account_name: Optional[str] = None, env_config_maps: Optional[List[str]] = None, env_secrets: Optional[List[str]] = None, env_vars: Optional[List[str]] = None, volume_mounts: Optional[List[Dict[str, Any]]] = None, volumes: Optional[List[Dict[str, Any]]] = None, labels: Optional[Dict[str, str]] = None, resources: Optional[Dict[str, Any]] = None, scheduler_name: Optional[str] = None, load_incluster_config: bool = True, kubeconfig_file: Optional[str] = None, timeout: Optional[int] = None, container_config: Optional[Dict[str, Any]] = None, pod_template_spec_metadata: Optional[Dict[str, Any]] = None, pod_spec_config: Optional[Dict[str, Any]] = None, job_metadata: Optional[Dict[str, Any]] = None, job_spec_config: Optional[Dict[str, Any]] = None, ): """This function is a utility for executing a Kubernetes job from within a Dagster op. Args: image (str): The image in which to launch the k8s job. command (Optional[List[str]]): The command to run in the container within the launched k8s job. Default: None. args (Optional[List[str]]): The args for the command for the container. Default: None. namespace (Optional[str]): Override the kubernetes namespace in which to run the k8s job. Default: None. image_pull_policy (Optional[str]): Allows the image pull policy to be overridden, e.g. to facilitate local testing with `kind <https://kind.sigs.k8s.io/>`_. Default: ``"Always"``. See: https://kubernetes.io/docs/concepts/containers/images/#updating-images. image_pull_secrets (Optional[List[Dict[str, str]]]): Optionally, a list of dicts, each of which corresponds to a Kubernetes ``LocalObjectReference`` (e.g., ``{'name': 'myRegistryName'}``). This allows you to specify the ```imagePullSecrets`` on a pod basis. Typically, these will be provided through the service account, when needed, and you will not need to pass this argument. See: https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod and https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#podspec-v1-core service_account_name (Optional[str]): The name of the Kubernetes service account under which to run the Job. Defaults to "default" env_config_maps (Optional[List[str]]): A list of custom ConfigMapEnvSource names from which to draw environment variables (using ``envFrom``) for the Job. Default: ``[]``. See: https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/#define-an-environment-variable-for-a-container env_secrets (Optional[List[str]]): A list of custom Secret names from which to draw environment variables (using ``envFrom``) for the Job. Default: ``[]``. See: https://kubernetes.io/docs/tasks/inject-data-application/distribute-credentials-secure/#configure-all-key-value-pairs-in-a-secret-as-container-environment-variables env_vars (Optional[List[str]]): A list of environment variables to inject into the Job. Default: ``[]``. See: https://kubernetes.io/docs/tasks/inject-data-application/distribute-credentials-secure/#configure-all-key-value-pairs-in-a-secret-as-container-environment-variables volume_mounts (Optional[List[Permissive]]): A list of volume mounts to include in the job's container. Default: ``[]``. See: https://v1-18.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#volumemount-v1-core volumes (Optional[List[Permissive]]): A list of volumes to include in the Job's Pod. Default: ``[]``. See: https://v1-18.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#volume-v1-core labels (Optional[Dict[str, str]]): Additional labels that should be included in the Job's Pod. See: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels resources (Optional[Dict[str, Any]]) Compute resource requirements for the container. See: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ scheduler_name (Optional[str]): Use a custom Kubernetes scheduler for launched Pods. See: https://kubernetes.io/docs/tasks/extend-kubernetes/configure-multiple-schedulers/ load_incluster_config (bool): Whether the op is running within a k8s cluster. If ``True``, we assume the launcher is running within the target cluster and load config using ``kubernetes.config.load_incluster_config``. Otherwise, we will use the k8s config specified in ``kubeconfig_file`` (using ``kubernetes.config.load_kube_config``) or fall back to the default kubeconfig. Default: True, kubeconfig_file (Optional[str]): The kubeconfig file from which to load config. Defaults to using the default kubeconfig. Default: None. timeout (Optional[int]): Raise an exception if the op takes longer than this timeout in seconds to execute. Default: None. container_config (Optional[Dict[str, Any]]): Raw k8s config for the k8s pod's main container (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#container-v1-core). Keys can either snake_case or camelCase.Default: None. pod_template_spec_metadata (Optional[Dict[str, Any]]): Raw k8s config for the k8s pod's metadata (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#objectmeta-v1-meta). Keys can either snake_case or camelCase. Default: None. pod_spec_config (Optional[Dict[str, Any]]): Raw k8s config for the k8s pod's pod spec (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#podspec-v1-core). Keys can either snake_case or camelCase. Default: None. job_metadata (Optional[Dict[str, Any]]): aw k8s config for the k8s job's metadata (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#objectmeta-v1-meta). Keys can either snake_case or camelCase. Default: None. job_spec_config (Optional[Dict[str, Any]]): Raw k8s config for the k8s job's job spec (https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.20/#jobspec-v1-batch). Keys can either snake_case or camelCase.Default: None. """ run_container_context = K8sContainerContext.create_for_run( context.dagster_run, ( context.instance.run_launcher if isinstance(context.instance.run_launcher, K8sRunLauncher) else None ), include_run_tags=False, ) container_config = container_config.copy() if container_config else {} if command: container_config["command"] = command op_container_context = K8sContainerContext( image_pull_policy=image_pull_policy, image_pull_secrets=image_pull_secrets, service_account_name=service_account_name, env_config_maps=env_config_maps, env_secrets=env_secrets, env_vars=env_vars, volume_mounts=volume_mounts, volumes=volumes, labels=labels, namespace=namespace, resources=resources, scheduler_name=scheduler_name, run_k8s_config={ "container_config": container_config, "pod_template_spec_metadata": pod_template_spec_metadata, "pod_spec_config": pod_spec_config, "job_metadata": job_metadata, "job_spec_config": job_spec_config, }, ) container_context = run_container_context.merge(op_container_context) namespace = container_context.namespace user_defined_k8s_config = container_context.get_run_user_defined_k8s_config() k8s_job_config = DagsterK8sJobConfig( job_image=image, dagster_home=None, image_pull_policy=container_context.image_pull_policy, image_pull_secrets=container_context.image_pull_secrets, service_account_name=container_context.service_account_name, instance_config_map=None, postgres_password_secret=None, env_config_maps=container_context.env_config_maps, env_secrets=container_context.env_secrets, env_vars=container_context.env_vars, volume_mounts=container_context.volume_mounts, volumes=container_context.volumes, labels=container_context.labels, resources=container_context.resources, ) job_name = get_k8s_job_name(context.run_id, context.get_step_execution_context().step.key) retry_number = context.retry_number if retry_number > 0: job_name = f"{job_name}-{retry_number}" labels = { "dagster/job": context.dagster_run.job_name, "dagster/op": context.op.name, "dagster/run-id": context.dagster_run.run_id, } if context.dagster_run.external_job_origin: labels["dagster/code-location"] = ( context.dagster_run.external_job_origin.external_repository_origin.code_location_origin.location_name ) job = construct_dagster_k8s_job( job_config=k8s_job_config, args=args, job_name=job_name, pod_name=job_name, component="k8s_job_op", user_defined_k8s_config=user_defined_k8s_config, labels=labels, ) if load_incluster_config: kubernetes.config.load_incluster_config() else: kubernetes.config.load_kube_config(kubeconfig_file) # changing this to be able to be passed in will allow for unit testing api_client = DagsterKubernetesClient.production_client() context.log.info(f"Creating Kubernetes job {job_name} in namespace {namespace}...") start_time = time.time() api_client.batch_api.create_namespaced_job(namespace, job) context.log.info("Waiting for Kubernetes job to finish...") timeout = timeout or 0 api_client.wait_for_job( job_name=job_name, namespace=namespace, wait_timeout=timeout, start_time=start_time, ) restart_policy = user_defined_k8s_config.pod_spec_config.get("restart_policy", "Never") if restart_policy == "Never": container_name = container_config.get("name", "dagster") pods = api_client.wait_for_job_to_have_pods( job_name, namespace, wait_timeout=timeout, start_time=start_time, ) pod_names = [p.metadata.name for p in pods] if not pod_names: raise Exception("No pod names in job after it started") pod_to_watch = pod_names[0] watch = kubernetes.watch.Watch() # consider moving in to api_client api_client.wait_for_pod( pod_to_watch, namespace, wait_timeout=timeout, start_time=start_time ) log_stream = watch.stream( api_client.core_api.read_namespaced_pod_log, name=pod_to_watch, namespace=namespace, container=container_name, ) while True: if timeout and time.time() - start_time > timeout: watch.stop() raise Exception("Timed out waiting for pod to finish") try: log_entry = next(log_stream) print(log_entry) # noqa: T201 except StopIteration: break else: context.log.info("Pod logs are disabled, because restart_policy is not Never") if job_spec_config and job_spec_config.get("parallelism"): num_pods_to_wait_for = job_spec_config["parallelism"] else: num_pods_to_wait_for = DEFAULT_JOB_POD_COUNT api_client.wait_for_running_job_to_succeed( job_name=job_name, namespace=namespace, wait_timeout=timeout, start_time=start_time, num_pods_to_wait_for=num_pods_to_wait_for, )
[docs]@op(ins={"start_after": In(Nothing)}, config_schema=K8S_JOB_OP_CONFIG) @experimental def k8s_job_op(context): """An op that runs a Kubernetes job using the k8s API. Contrast with the `k8s_job_executor`, which runs each Dagster op in a Dagster job in its own k8s job. This op may be useful when: - You need to orchestrate a command that isn't a Dagster op (or isn't written in Python) - You want to run the rest of a Dagster job using a specific executor, and only a single op in k8s. For example: .. literalinclude:: ../../../../../../python_modules/libraries/dagster-k8s/dagster_k8s_tests/unit_tests/test_example_k8s_job_op.py :start-after: start_marker :end-before: end_marker :language: python You can create your own op with the same implementation by calling the `execute_k8s_job` function inside your own op. The service account that is used to run this job should have the following RBAC permissions: .. literalinclude:: ../../../../../../examples/docs_snippets/docs_snippets/deploying/kubernetes/k8s_job_op_rbac.yaml :language: YAML """ execute_k8s_job(context, **context.op_config)