Feature #17349
Updated by Nico César about 3 years ago
This specification is for the server side (client side of this will be on separate tickets,). The component railsapi (endpoint /arvados/v1/collections) and making sure that controller has all the plumbing in place This ticket will cover (api) * railsapi (including storing in the database) * controller * documentation updates with the new behaviour This ticket will not cover * client behaviour * keep-balance behavirour Current behaviour for collections' "replicas_desired" is to accept a Number[1] or 'null'. This has to be changed the database has the correct field type and stores correctly To complete Epic #16107 all components in Arvados should be able to send a number of storage tiers and their desired replication for each tier. Valid values: |_. Request Values |_. defaultCollectionReplication |_. Collection Effective Value |_. Notes | | replicas_desired=null (or omited from the request) | 3 | {"default": 3} | current behaviour | | replicas_desired=null (or omited from the request) | | {"default": 2} | current behaviour see [2] | | replicas_desired=42 | 2| {"default": 42} | | | replicas_desired={"default": 34} | 2 | {"default": 34} | | | replicas_desired={"archival": 1} | 2 | {"default": 1, "archival": 1} | To be talked in next grooming session. | | replicas_desired={"default": 1 "archival": 1} | 2 | {"default": 1, "archival": 1} | | | replicas_desired={"archival": 2} | 2 | {"default": 0, "archival": 2} | To be talked in next grooming session. | This are values that should be rejected (To be talked in next grooming session) |_. Invalid values |_. Notes | | replicas_desired="42" | strings should not be allowed | | replicas_desired={"default": "34"} | strings should not be allowed | | replicas_desired={"archival": -1} | negative numbers should not be allowed| | replicas_desired={} | empty json object should not be allowed | The "Effective value" has to be stored in the database and when the collection is queried, should be return as a JSON object. To be talked in next grooming session: * For the error send the user an error, we only will discuss the API errors. arv-put, arvados-cwl-runner and other clients will have their own ticket * What should we do when returning current values ? should we return replicas_desired=42 or replicas_desired={"default":42} ? * How will backward compatibility works here? * if the current effective value is {"default": 1, "archival": 1}, how old client will react? [1] https://doc.arvados.org/v2.1/api/methods/collections.html [2] https://doc.arvados.org/v2.0/sdk/python/arvados/arvados.collection-pysrc.html#Collection._my_block_manager