ahmad-maruf opened a new pull request #9235:
URL: https://github.com/apache/airflow/pull/9235


   Description: 
   
    - Resolves / Fixes: #9127 
    - The current Airflow 1.10.10 API for `EmrAddStepOperator` throws an error 
when it is initialized with `job_flow_name` (aka EMR cluster name) as opposed 
`job_flow_id` (`AttributeError: 'EMR' object has no attribute 
'get_cluster_id_by_name'`, see issue #9127 for more details). As a result, the 
task instance as well as the corresponding DagRun fails. There is a bug in the 
`execute()` method of `emr_add_step_operator.py` class in which the EMR client 
uses the wrong API to retrieve the `job_flow_id` with the given `job_flow_name` 
passed to the `EmrAddStepOperator`. This is a very simple fix for this bug. 
   
    - Updated unit test as well. 
   
    - Tested against Python 3.7.7 local environment
   
    - Airflow version used in the development: 1.10.10
   
   ---
   Make sure to mark the boxes below before creating PR: [x]
   
   - [x] Description above provides context of the change
   - [x] Unit tests coverage for changes (not needed for documentation changes)
   - [x] Target Github ISSUE in description if exists
   - [x ] Commits follow "[How to write a good git commit 
message](http://chris.beams.io/posts/git-commit/)"
   - [x] Relevant documentation is updated including usage instructions.
   - [x] I will engage committers as explained in [Contribution Workflow 
Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
   
   ---
   In case of fundamental code change, Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
 is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party 
License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in 
[UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md).
   Read the [Pull Request 
Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines)
 for more information.
   


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