Blake Livingston created AIRFLOW-2246:
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             Summary: Add error messaging to CLI variable import
                 Key: AIRFLOW-2246
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2246
             Project: Apache Airflow
          Issue Type: Bug
          Components: cli
    Affects Versions: Airflow 1.8
            Reporter: Blake Livingston


When importing variables from the CLI, the load will be incomplete if any of 
the variable values fail to parse. In the case I noticed, I had used a Number 
rather than a string.

E.g.

{ "var1": "OK",
  "var2": 4,
  "var3", "skipped"}

airflow variables -i vars.json
will unhelpfully return:
"1 of 3 variables successfully updated."
I believe this is due to passing on Exception here:
[https://github.com/apache/incubator-airflow/blob/master/airflow/bin/cli.py#L306]

Would be cool to just write an error with the variable, value, and exception 
message.
next level of safety+usability would be to have it validate all variables 
before applying them. An atomic failure is safer and preferable to a partial 
load for most users, I would suspect.



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