Andres de la Peña created CASSANDRA-16871:
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             Summary: Add resource flags to CircleCi config generation script
                 Key: CASSANDRA-16871
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16871
             Project: Cassandra
          Issue Type: Task
            Reporter: Andres de la Peña
            Assignee: Andres de la Peña


Currently we have three versions of the CircleCI config file using different 
resources. Changing the resources configuration is as easy as copying the 
desired template file, for example:
{code}
cp .circleci/config.yml.MIDRES .circleci/config.yml
{code}
If we want to make changes to the file, for example to set a specific dtest 
repo or running the test multiplexer, we can run the provided generation 
script, copy the template file and probably exclude the additional changes:
{code}
# edit config-2_1.yml
.circleci/generate.sh
cp .circleci/config.yml.MIDRES .circleci/config.yml
# undo the changes in config.yml.LOWRES, config.yml.MIDRES and 
config.yml.HIGHRES
{code}
A very common alternative to this is just editing the environment variables in 
the automatically generated {{config.yml}} file, which are repeated some 19 
times across the file:
{code}
cp .circleci/config.yml.MIDRES .circleci/config.yml
# edit config.yml, where env vars are repeated
{code}
I think we could do this slightly easier by adding a set of flags to the 
generation script to apply the resources patch directly to {{config.yml}}, 
without changing the templates:
{code}
# edit config-2_1.yml
.circleci/generate.sh -m
{code}
This has the advantage of not requiring manually editing the automatically 
generated file and also providing some validation.



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