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scylladb / scylla-ansible-roles

Ansible roles for deploying and managing Scylla, Scylla-Manager and Scylla-Monitoring
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scylla_yaml_params defaults are ignored when used on playbook #129

Open hopugop opened 2 years ago

hopugop commented 2 years ago

Defining scylla_yaml_params within a playbook drops all default options for that entry defined in defaults/main.yml. We should extend the defaults rather than erasing them when users provides custom scylla_yaml_params. If the parameters conflict, user's should be effective upon merging.

https://github.com/scylladb/scylla-ansible-roles/blob/855a7f6a3194646933e8fb0257e362e45cdb75a6/ansible-scylla-node/defaults/main.yml#L194-L200

vladzcloudius commented 2 years ago

Can you, please, clarify your point with a specific example, @hopugop ?

hopugop commented 2 years ago

@vladzcloudius when providing custom parameters via scylla_yaml_params on a playbook:

scylla_yaml_params:
  alternator_port: 8000
  alternator_write_isolation: only_rmw_uses_lwt

The rest of the default parameters are not applied (except for authenticator and authorizer which are overridden by scylla_authentication: True which is also a default): https://github.com/scylladb/scylla-ansible-roles/blob/855a7f6a3194646933e8fb0257e362e45cdb75a6/ansible-scylla-node/defaults/main.yml#L194-L200

Only variables present at the user provided scylla_yaml_params + overriden by scylla_authentication are present at the generated yaml:

root@node1-ubuntu:~# egrep 'authorizer:|authenticator:|enable_sstables_mc_format:|internode_compression:|alternator' /etc/scylla/scylla.yaml 
authenticator: PasswordAuthenticator
authorizer: CassandraAuthorizer
alternator_port: 8000
alternator_write_isolation: only_rmw_uses_lwt
root@node1-ubuntu:~#

The fix is to merge user-provided scylla_yaml_params with the ones present at the defaults, and in case there's a conflict, user's should be effective.