How to use Boto3 to check whether a Glue Job exists or not?

Problem Statement − Use boto3 library in Python to check whether a glue job exists or not. For example, check whether run_s3_file_job exists in AWS glue or not.

Approach/Algorithm to solve this problem

Step 1 − Import boto3 and botocore exceptions to handle exceptions.

Step 2 − job_name is the parameters in function.

Step 3 − Create an AWS session using boto3 library. Make sure region_name is mentioned in default profile. If it is not mentioned, then explicitly pass the region_name while creating the session.

Step 4 − Create an AWS client for glue.

Step 5 − Now use the get_job function and pass the JobName.

Step 6 − If the job exists, the response will contain all the details about the job, else it throws an exception.

Step 7 − Handle the generic exception if something went wrong while checking the job.

Example

Use the following code to check whether a glue job exists or not −

import boto3
from botocore.exceptions import ClientError

def check_glue_job_exists(job_name):
   session = boto3.session.Session()
   glue_client = session.client('glue')
   try:
      response = glue_client.get_job(JobName=job_name)
   return response
   except ClientError as e:
      raise Exception( "boto3 client error in check_glue_job_exists: " + e.__str__())
   except Exception as e:
      raise Exception( "Unexpected error in check_glue_job_exists: " + e.__str__())

#To check existing job
print(check_glue_job_exists("run_s3_file_job"))
#Job doesn’t exist
print(check_glue_job_exists("run_s3_file_job_not_exist"))

Output

#To check existing job
{'Job': {'Name': 'run_s3_file_job', 'Description': 'Glue job for the
test', 'Role': 'arn:aws:iam::12345:role/delegated/glue-service-role',
'CreatedOn': datetime.datetime(2021, 02, 10, 15, 7, 3, 638000,
tzinfo=tzlocal()), 'LastModifiedOn': datetime.datetime(2021, 02, 10, 15,
7, 3, 638000, tzinfo=tzlocal()), 'ExecutionProperty':
{'MaxConcurrentRuns': 1}, 'Command': {'Name': 'glueetl',
'ScriptLocation': 's3://test/pipeline.py', 'PythonVersion': '3'},
'DefaultArguments': { '--job-language': 'python', 'Step': '0'},
'MaxRetries': 0, 'AllocatedCapacity': 4, 'Timeout': 2880, 'MaxCapacity':
4.0, 'WorkerType': 'G.1X', 'NumberOfWorkers': 4, 'GlueVersion': '2.0'},
'ResponseMetadata': {'RequestId': 'e3ec9e2c-e75d-4443-bfeafef674fff7e9', 'HTTPStatusCode': 200, 'HTTPHeaders': {'date': 'Sat, 13
Feb 2021 13:20:27 GMT', 'content-type': 'application/x-amz-json-1.1',
'content-length': '1501', 'connection': 'keep-alive', 'x-amznrequestid': 'e3ec9e2c-e75d-4443-bfea-fef674fff7e9'}, 'RetryAttempts':
0}}

#Job doesn’t exist
botocore.errorfactory.EntityNotFoundException: An error occurred
(EntityNotFoundException) when calling the GetJob operation: Job with
name: run_s3_file_job_not_exist not found.