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Federation implementation roadmap » History » Revision 15

Revision 14 (Peter Amstutz, 09/12/2018 02:36 PM) → Revision 15/16 (Peter Amstutz, 09/12/2018 02:49 PM)

h1. Federation implementation roadmap 

 Use a remote-hosted workflow #13493 

 * When retrieving a workflow record for arvados-cwl-runner, API server notices workflow UUID is remote, and fetches it with salted token (instead of looking in local DB) 

 Mount remote-hosted collection (read-only) - [[Federated collections]] 

 * (controller) fetch remote-hosted container by UUID (similar to workflow case) (#13993) 
 * (controller) rewrite locators in manifest to indicate remote cluster    (#13993) 
 * (keepstore) if locator indicates remote cluster and data does not exist locally (or local signature is not supplied), fetch from remote using salted token (#13994) 

 Mount remote-hosted collection (read-only) in a container 

 * When creating a container to satisfy a CR, Rails API assumes any PDH appearing in the CR mounts is OK. 
 * When running the container, arv-mount (and any other client) will go through the controller to get the collection. 
 * The controller will search the federation for any PDH not found (or not readable by the acting user) in the local DB. (#14087) 
 * API server issues v2 format auth tokens (#14196) 

 Run some portions of a CWL workflow on a remote cluster 

 * When submitting container requests, a-c-r follows workflow/commandline/input UUID hints to choose a cluster.  
 * a-c-r submits CRs to its home cluster with owner_uuid, if owner_uuid is a remote cluster, the controller proxies those requests to remote the cluster (#14197) 
 * When creating a container request on a remote cluster, submitter can specify a container token with appropriate privileges  
 * When a-c-r requests a batch of containers, the controller proxies requests to remotes as needed to get a full response (#13619) 
 * To prepare final output collection, must be able to copy files from a remote hosted collection to a local one. 
 ** Requires converting blocks with +R hints to +A hints (#14199) 
 ** Involves copying blocks from remote cluster to local storage to get local signed locator to create collection. (if necessary, could be done on client / cwl-runner side.)