airflow.operators.branch

Branching operators.

Module Contents

Classes

BranchMixIn

Utility helper which handles the branching as one-liner.

BaseBranchOperator

A base class for creating operators with branching functionality, like to BranchPythonOperator.
class airflow.operators.branch.BranchMixIn(context=None)[source]

Bases: airflow.models.skipmixin.SkipMixin

Utility helper which handles the branching as one-liner.

do_branch(context, branches_to_execute)[source]

Implement the handling of branching including logging.

class airflow.operators.branch.BaseBranchOperator(task_id, owner=DEFAULT_OWNER, email=None, email_on_retry=conf.getboolean('email', 'default_email_on_retry', fallback=True), email_on_failure=conf.getboolean('email', 'default_email_on_failure', fallback=True), retries=DEFAULT_RETRIES, retry_delay=DEFAULT_RETRY_DELAY, retry_exponential_backoff=False, max_retry_delay=None, start_date=None, end_date=None, depends_on_past=False, ignore_first_depends_on_past=DEFAULT_IGNORE_FIRST_DEPENDS_ON_PAST, wait_for_past_depends_before_skipping=DEFAULT_WAIT_FOR_PAST_DEPENDS_BEFORE_SKIPPING, wait_for_downstream=False, dag=None, params=None, default_args=None, priority_weight=DEFAULT_PRIORITY_WEIGHT, weight_rule=DEFAULT_WEIGHT_RULE, queue=DEFAULT_QUEUE, pool=None, pool_slots=DEFAULT_POOL_SLOTS, sla=None, execution_timeout=DEFAULT_TASK_EXECUTION_TIMEOUT, on_execute_callback=None, on_failure_callback=None, on_success_callback=None, on_retry_callback=None, on_skipped_callback=None, pre_execute=None, post_execute=None, trigger_rule=DEFAULT_TRIGGER_RULE, resources=None, run_as_user=None, task_concurrency=None, map_index_template=None, max_active_tis_per_dag=None, max_active_tis_per_dagrun=None, executor_config=None, do_xcom_push=True, multiple_outputs=False, inlets=None, outlets=None, task_group=None, doc=None, doc_md=None, doc_json=None, doc_yaml=None, doc_rst=None, task_display_name=None, logger_name=None, allow_nested_operators=True, **kwargs)[source]

Bases: airflow.models.baseoperator.BaseOperator, BranchMixIn

A base class for creating operators with branching functionality, like to BranchPythonOperator.

Users should create a subclass from this operator and implement the function choose_branch(self, context). This should run whatever business logic is needed to determine the branch, and return either the task_id for a single task (as a str) or a list of task_ids.

The operator will continue with the returned task_id(s), and all other tasks directly downstream of this operator will be skipped.

abstract choose_branch(context)[source]

Abstract method to choose which branch to run.

Subclasses should implement this, running whatever logic is necessary to choose a branch and returning a task_id or list of task_ids.

Parameters

context (airflow.utils.context.Context) – Context dictionary as passed to execute()

execute(context)[source]

Derive when creating an operator.

Context is the same dictionary used as when rendering jinja templates.

Refer to get_template_context for more context.

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