Hi Dev,

I'm working on https://issues.apache.org/jira/browse/AIRAVATA-3126 
<https://issues.apache.org/jira/browse/AIRAVATA-3126> to add reservation 
metadata to the GroupComputeResourcePreference data model.  I want to get some 
feedback on the proposed data model:

* A GroupComputeResourcePreference can have one or more Reservations
  * This changes from the current data model which is that there can only be 
one reservation
* Each Reservation can have one or more queues/partitions. A cluster 
reservation applies to one or more (or all) queues of the 
GroupComputeResourcePreference's compute host.
  * This changes from the current data model in which a reservation is applied 
to all queues of a cluster, which isn't correct when a reservation has been 
created for only a subset of a compute resource's queues.
* Each Reservation has a reservationName and a startTime and endTime.

My hope is that this data model reflects how cluster reservations are used in 
practice. If I've missed anything, please let me know.

Thanks,

Marcus

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