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from __future__ import annotations
from functools import cached_property
from typing import TYPE_CHECKING, Any, Sequence
from airflow.configuration import conf
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.athena import AthenaHook
from airflow.providers.amazon.aws.triggers.athena import AthenaTrigger
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class AthenaOperator(BaseOperator):
"""
An operator that submits a presto query to athena.
.. note:: if the task is killed while it runs, it'll cancel the athena query that was launched,
EXCEPT if running in deferrable mode.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:AthenaOperator`
:param query: Presto to be run on athena. (templated)
:param database: Database to select. (templated)
:param output_location: s3 path to write the query results into. (templated)
:param aws_conn_id: aws connection to use
:param client_request_token: Unique token created by user to avoid multiple executions of same query
:param workgroup: Athena workgroup in which query will be run. (templated)
:param query_execution_context: Context in which query need to be run
:param result_configuration: Dict with path to store results in and config related to encryption
:param sleep_time: Time (in seconds) to wait between two consecutive calls to check query status on Athena
:param max_polling_attempts: Number of times to poll for query state before function exits
To limit task execution time, use execution_timeout.
:param log_query: Whether to log athena query and other execution params when it's executed.
Defaults to *True*.
"""
[docs] template_fields: Sequence[str] = ("query", "database", "output_location", "workgroup")
[docs] template_ext: Sequence[str] = (".sql",)
[docs] template_fields_renderers = {"query": "sql"}
def __init__(
self,
*,
query: str,
database: str,
output_location: str,
aws_conn_id: str = "aws_default",
client_request_token: str | None = None,
workgroup: str = "primary",
query_execution_context: dict[str, str] | None = None,
result_configuration: dict[str, Any] | None = None,
sleep_time: int = 30,
max_polling_attempts: int | None = None,
log_query: bool = True,
deferrable: bool = conf.getboolean("operators", "default_deferrable", fallback=False),
**kwargs: Any,
) -> None:
super().__init__(**kwargs)
self.query = query
self.database = database
self.output_location = output_location
self.aws_conn_id = aws_conn_id
self.client_request_token = client_request_token
self.workgroup = workgroup
self.query_execution_context = query_execution_context or {}
self.result_configuration = result_configuration or {}
self.sleep_time = sleep_time
self.max_polling_attempts = max_polling_attempts or 999999
self.query_execution_id: str | None = None
self.log_query: bool = log_query
self.deferrable = deferrable
@cached_property
[docs] def hook(self) -> AthenaHook:
"""Create and return an AthenaHook."""
return AthenaHook(self.aws_conn_id, log_query=self.log_query)
[docs] def execute(self, context: Context) -> str | None:
"""Run Presto Query on Athena."""
self.query_execution_context["Database"] = self.database
self.result_configuration["OutputLocation"] = self.output_location
self.query_execution_id = self.hook.run_query(
self.query,
self.query_execution_context,
self.result_configuration,
self.client_request_token,
self.workgroup,
)
if self.deferrable:
self.defer(
trigger=AthenaTrigger(
self.query_execution_id, self.sleep_time, self.max_polling_attempts, self.aws_conn_id
),
method_name="execute_complete",
)
# implicit else:
query_status = self.hook.poll_query_status(
self.query_execution_id,
max_polling_attempts=self.max_polling_attempts,
sleep_time=self.sleep_time,
)
if query_status in AthenaHook.FAILURE_STATES:
error_message = self.hook.get_state_change_reason(self.query_execution_id)
raise Exception(
f"Final state of Athena job is {query_status}, query_execution_id is "
f"{self.query_execution_id}. Error: {error_message}"
)
elif not query_status or query_status in AthenaHook.INTERMEDIATE_STATES:
raise Exception(
f"Final state of Athena job is {query_status}. Max tries of poll status exceeded, "
f"query_execution_id is {self.query_execution_id}."
)
return self.query_execution_id
[docs] def execute_complete(self, context, event=None):
if event["status"] != "success":
raise AirflowException(f"Error while waiting for operation on cluster to complete: {event}")
return event["value"]
[docs] def on_kill(self) -> None:
"""Cancel the submitted athena query."""
if self.query_execution_id:
self.log.info("Received a kill signal.")
response = self.hook.stop_query(self.query_execution_id)
http_status_code = None
try:
http_status_code = response["ResponseMetadata"]["HTTPStatusCode"]
except Exception:
self.log.exception(
"Exception while cancelling query. Query execution id: %s", self.query_execution_id
)
finally:
if http_status_code is None or http_status_code != 200:
self.log.error("Unable to request query cancel on athena. Exiting")
else:
self.log.info(
"Polling Athena for query with id %s to reach final state", self.query_execution_id
)
self.hook.poll_query_status(self.query_execution_id, sleep_time=self.sleep_time)
