Cristòfol Torrens created AIRFLOW-2380:
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             Summary: Add support for environment variables in Spark submit 
operator
                 Key: AIRFLOW-2380
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2380
             Project: Apache Airflow
          Issue Type: Improvement
          Components: contrib, operators
            Reporter: Cristòfol Torrens
            Assignee: Cristòfol Torrens


Add support for environment variables in Spark submit operator.

For example, to pass the *HADOOP_CONF_DIR* in case of use same Spark cluster 
with multiple HDFS.

The idea is to pass as a dict, and resolve it in the case of using 
*yarn-*_client/cluster_*,* and *standalone-*_client_ mode.

In *standalone-*_cluster_ mode is not possible to do this.



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