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"""
A client for AWS batch services
.. seealso::
- http://boto3.readthedocs.io/en/latest/guide/configuration.html
- http://boto3.readthedocs.io/en/latest/reference/services/batch.html
- https://docs.aws.amazon.com/batch/latest/APIReference/Welcome.html
"""
from random import uniform
from time import sleep
from typing import Dict, List, Optional, Union
import botocore.client
import botocore.exceptions
import botocore.waiter
from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
from airflow.typing_compat import Protocol, runtime_checkable
[docs]@runtime_checkable
class AwsBatchProtocol(Protocol):
"""
A structured Protocol for ``boto3.client('batch') -> botocore.client.Batch``.
This is used for type hints on :py:meth:`.AwsBatchClient.client`; it covers
only the subset of client methods required.
.. seealso::
- https://mypy.readthedocs.io/en/latest/protocols.html
- http://boto3.readthedocs.io/en/latest/reference/services/batch.html
"""
[docs] def describe_jobs(self, jobs: List[str]) -> Dict:
"""
Get job descriptions from AWS batch
:param jobs: a list of JobId to describe
:type jobs: List[str]
:return: an API response to describe jobs
:rtype: Dict
"""
...
[docs] def get_waiter(self, waiterName: str) -> botocore.waiter.Waiter:
"""
Get an AWS Batch service waiter
:param waiterName: The name of the waiter. The name should match
the name (including the casing) of the key name in the waiter
model file (typically this is CamelCasing).
:type waiterName: str
:return: a waiter object for the named AWS batch service
:rtype: botocore.waiter.Waiter
.. note::
AWS batch might not have any waiters (until botocore PR-1307 is released).
.. code-block:: python
import boto3
boto3.client("batch").waiter_names == []
.. seealso::
- https://boto3.amazonaws.com/v1/documentation/api/latest/guide/clients.html#waiters
- https://github.com/boto/botocore/pull/1307
"""
...
[docs] def submit_job(
self,
jobName: str,
jobQueue: str,
jobDefinition: str,
arrayProperties: Dict,
parameters: Dict,
containerOverrides: Dict,
tags: Dict,
) -> Dict:
"""
Submit a batch job
:param jobName: the name for the AWS batch job
:type jobName: str
:param jobQueue: the queue name on AWS Batch
:type jobQueue: str
:param jobDefinition: the job definition name on AWS Batch
:type jobDefinition: str
:param arrayProperties: the same parameter that boto3 will receive
:type arrayProperties: Dict
:param parameters: the same parameter that boto3 will receive
:type parameters: Dict
:param containerOverrides: the same parameter that boto3 will receive
:type containerOverrides: Dict
:param tags: the same parameter that boto3 will receive
:type tags: Dict
:return: an API response
:rtype: Dict
"""
...
[docs] def terminate_job(self, jobId: str, reason: str) -> Dict:
"""
Terminate a batch job
:param jobId: a job ID to terminate
:type jobId: str
:param reason: a reason to terminate job ID
:type reason: str
:return: an API response
:rtype: Dict
"""
...
# Note that the use of invalid-name parameters should be restricted to the boto3 mappings only;
# all the Airflow wrappers of boto3 clients should not adopt invalid-names to match boto3.
[docs]class AwsBatchClientHook(AwsBaseHook):
"""
A client for AWS batch services.
:param max_retries: exponential back-off retries, 4200 = 48 hours;
polling is only used when waiters is None
:type max_retries: Optional[int]
:param status_retries: number of HTTP retries to get job status, 10;
polling is only used when waiters is None
:type status_retries: Optional[int]
.. note::
Several methods use a default random delay to check or poll for job status, i.e.
``random.uniform(DEFAULT_DELAY_MIN, DEFAULT_DELAY_MAX)``
Using a random interval helps to avoid AWS API throttle limits
when many concurrent tasks request job-descriptions.
To modify the global defaults for the range of jitter allowed when a
random delay is used to check batch job status, modify these defaults, e.g.:
.. code-block::
AwsBatchClient.DEFAULT_DELAY_MIN = 0
AwsBatchClient.DEFAULT_DELAY_MAX = 5
When explicit delay values are used, a 1 second random jitter is applied to the
delay (e.g. a delay of 0 sec will be a ``random.uniform(0, 1)`` delay. It is
generally recommended that random jitter is added to API requests. A
convenience method is provided for this, e.g. to get a random delay of
10 sec +/- 5 sec: ``delay = AwsBatchClient.add_jitter(10, width=5, minima=0)``
.. seealso::
- https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/batch.html
- https://docs.aws.amazon.com/general/latest/gr/api-retries.html
- https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
"""
# delays are in seconds
def __init__(
self, *args, max_retries: Optional[int] = None, status_retries: Optional[int] = None, **kwargs
) -> None:
# https://github.com/python/mypy/issues/6799 hence type: ignore
super().__init__(client_type='batch', *args, **kwargs) # type: ignore
self.max_retries = max_retries or self.MAX_RETRIES
self.status_retries = status_retries or self.STATUS_RETRIES
@property
[docs] def client(self) -> Union[AwsBatchProtocol, botocore.client.BaseClient]:
"""
An AWS API client for batch services.
:return: a boto3 'batch' client for the ``.region_name``
:rtype: Union[AwsBatchProtocol, botocore.client.BaseClient]
"""
return self.conn
[docs] def terminate_job(self, job_id: str, reason: str) -> Dict:
"""
Terminate a batch job
:param job_id: a job ID to terminate
:type job_id: str
:param reason: a reason to terminate job ID
:type reason: str
:return: an API response
:rtype: Dict
"""
response = self.get_conn().terminate_job(jobId=job_id, reason=reason)
self.log.info(response)
return response
[docs] def check_job_success(self, job_id: str) -> bool:
"""
Check the final status of the batch job; return True if the job
'SUCCEEDED', else raise an AirflowException
:param job_id: a batch job ID
:type job_id: str
:rtype: bool
:raises: AirflowException
"""
job = self.get_job_description(job_id)
job_status = job.get("status")
if job_status == "SUCCEEDED":
self.log.info("AWS batch job (%s) succeeded: %s", job_id, job)
return True
if job_status == "FAILED":
raise AirflowException(f"AWS Batch job ({job_id}) failed: {job}")
if job_status in ["SUBMITTED", "PENDING", "RUNNABLE", "STARTING", "RUNNING"]:
raise AirflowException(f"AWS Batch job ({job_id}) is not complete: {job}")
raise AirflowException(f"AWS Batch job ({job_id}) has unknown status: {job}")
[docs] def wait_for_job(self, job_id: str, delay: Union[int, float, None] = None) -> None:
"""
Wait for batch job to complete
:param job_id: a batch job ID
:type job_id: str
:param delay: a delay before polling for job status
:type delay: Optional[Union[int, float]]
:raises: AirflowException
"""
self.delay(delay)
self.poll_for_job_running(job_id, delay)
self.poll_for_job_complete(job_id, delay)
self.log.info("AWS Batch job (%s) has completed", job_id)
[docs] def poll_for_job_running(self, job_id: str, delay: Union[int, float, None] = None) -> None:
"""
Poll for job running. The status that indicates a job is running or
already complete are: 'RUNNING'|'SUCCEEDED'|'FAILED'.
So the status options that this will wait for are the transitions from:
'SUBMITTED'>'PENDING'>'RUNNABLE'>'STARTING'>'RUNNING'|'SUCCEEDED'|'FAILED'
The completed status options are included for cases where the status
changes too quickly for polling to detect a RUNNING status that moves
quickly from STARTING to RUNNING to completed (often a failure).
:param job_id: a batch job ID
:type job_id: str
:param delay: a delay before polling for job status
:type delay: Optional[Union[int, float]]
:raises: AirflowException
"""
self.delay(delay)
running_status = ["RUNNING", "SUCCEEDED", "FAILED"]
self.poll_job_status(job_id, running_status)
[docs] def poll_for_job_complete(self, job_id: str, delay: Union[int, float, None] = None) -> None:
"""
Poll for job completion. The status that indicates job completion
are: 'SUCCEEDED'|'FAILED'.
So the status options that this will wait for are the transitions from:
'SUBMITTED'>'PENDING'>'RUNNABLE'>'STARTING'>'RUNNING'>'SUCCEEDED'|'FAILED'
:param job_id: a batch job ID
:type job_id: str
:param delay: a delay before polling for job status
:type delay: Optional[Union[int, float]]
:raises: AirflowException
"""
self.delay(delay)
complete_status = ["SUCCEEDED", "FAILED"]
self.poll_job_status(job_id, complete_status)
[docs] def poll_job_status(self, job_id: str, match_status: List[str]) -> bool:
"""
Poll for job status using an exponential back-off strategy (with max_retries).
:param job_id: a batch job ID
:type job_id: str
:param match_status: a list of job status to match; the batch job status are:
'SUBMITTED'|'PENDING'|'RUNNABLE'|'STARTING'|'RUNNING'|'SUCCEEDED'|'FAILED'
:type match_status: List[str]
:rtype: bool
:raises: AirflowException
"""
retries = 0
while True:
job = self.get_job_description(job_id)
job_status = job.get("status")
self.log.info(
"AWS Batch job (%s) check status (%s) in %s",
job_id,
job_status,
match_status,
)
if job_status in match_status:
return True
if retries >= self.max_retries:
raise AirflowException(f"AWS Batch job ({job_id}) status checks exceed max_retries")
retries += 1
pause = self.exponential_delay(retries)
self.log.info(
"AWS Batch job (%s) status check (%d of %d) in the next %.2f seconds",
job_id,
retries,
self.max_retries,
pause,
)
self.delay(pause)
[docs] def get_job_description(self, job_id: str) -> Dict:
"""
Get job description (using status_retries).
:param job_id: a batch job ID
:type job_id: str
:return: an API response for describe jobs
:rtype: Dict
:raises: AirflowException
"""
retries = 0
while True:
try:
response = self.get_conn().describe_jobs(jobs=[job_id])
return self.parse_job_description(job_id, response)
except botocore.exceptions.ClientError as err:
error = err.response.get("Error", {})
if error.get("Code") == "TooManyRequestsException":
pass # allow it to retry, if possible
else:
raise AirflowException(f"AWS Batch job ({job_id}) description error: {err}")
retries += 1
if retries >= self.status_retries:
raise AirflowException(
f"AWS Batch job ({job_id}) description error: exceeded status_retries "
f"({self.status_retries})"
)
pause = self.exponential_delay(retries)
self.log.info(
"AWS Batch job (%s) description retry (%d of %d) in the next %.2f seconds",
job_id,
retries,
self.status_retries,
pause,
)
self.delay(pause)
@staticmethod
[docs] def parse_job_description(job_id: str, response: Dict) -> Dict:
"""
Parse job description to extract description for job_id
:param job_id: a batch job ID
:type job_id: str
:param response: an API response for describe jobs
:type response: Dict
:return: an API response to describe job_id
:rtype: Dict
:raises: AirflowException
"""
jobs = response.get("jobs", [])
matching_jobs = [job for job in jobs if job.get("jobId") == job_id]
if len(matching_jobs) != 1:
raise AirflowException(f"AWS Batch job ({job_id}) description error: response: {response}")
return matching_jobs[0]
@staticmethod
[docs] def add_jitter(
delay: Union[int, float], width: Union[int, float] = 1, minima: Union[int, float] = 0
) -> float:
"""
Use delay +/- width for random jitter
Adding jitter to status polling can help to avoid
AWS batch API limits for monitoring batch jobs with
a high concurrency in Airflow tasks.
:param delay: number of seconds to pause;
delay is assumed to be a positive number
:type delay: Union[int, float]
:param width: delay +/- width for random jitter;
width is assumed to be a positive number
:type width: Union[int, float]
:param minima: minimum delay allowed;
minima is assumed to be a non-negative number
:type minima: Union[int, float]
:return: uniform(delay - width, delay + width) jitter
and it is a non-negative number
:rtype: float
"""
delay = abs(delay)
width = abs(width)
minima = abs(minima)
lower = max(minima, delay - width)
upper = delay + width
return uniform(lower, upper)
@staticmethod
[docs] def delay(delay: Union[int, float, None] = None) -> None:
"""
Pause execution for ``delay`` seconds.
:param delay: a delay to pause execution using ``time.sleep(delay)``;
a small 1 second jitter is applied to the delay.
:type delay: Optional[Union[int, float]]
.. note::
This method uses a default random delay, i.e.
``random.uniform(DEFAULT_DELAY_MIN, DEFAULT_DELAY_MAX)``;
using a random interval helps to avoid AWS API throttle limits
when many concurrent tasks request job-descriptions.
"""
if delay is None:
delay = uniform(AwsBatchClientHook.DEFAULT_DELAY_MIN, AwsBatchClientHook.DEFAULT_DELAY_MAX)
else:
delay = AwsBatchClientHook.add_jitter(delay)
sleep(delay)
@staticmethod
[docs] def exponential_delay(tries: int) -> float:
"""
An exponential back-off delay, with random jitter. There is a maximum
interval of 10 minutes (with random jitter between 3 and 10 minutes).
This is used in the :py:meth:`.poll_for_job_status` method.
:param tries: Number of tries
:type tries: int
:rtype: float
Examples of behavior:
.. code-block:: python
def exp(tries):
max_interval = 600.0 # 10 minutes in seconds
delay = 1 + pow(tries * 0.6, 2)
delay = min(max_interval, delay)
print(delay / 3, delay)
for tries in range(10):
exp(tries)
# 0.33 1.0
# 0.45 1.35
# 0.81 2.44
# 1.41 4.23
# 2.25 6.76
# 3.33 10.00
# 4.65 13.95
# 6.21 18.64
# 8.01 24.04
# 10.05 30.15
.. seealso::
- https://docs.aws.amazon.com/general/latest/gr/api-retries.html
- https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/
"""
max_interval = 600.0 # results in 3 to 10 minute delay
delay = 1 + pow(tries * 0.6, 2)
delay = min(max_interval, delay)
return uniform(delay / 3, delay)