[jira] [Created] (AURORA-137) Save host attributes only when a task is being scheduled

["Bill Farner (JIRA)" <ji...@apache.org>]

Bill Farner created AURORA-137:
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             Summary: Save host attributes only when a task is being scheduled
                 Key: AURORA-137
                 URL: https://issues.apache.org/jira/browse/AURORA-137
             Project: Aurora
          Issue Type: Story
          Components: Scheduler
            Reporter: Bill Farner


The scheduler currently aggressively saves host attributes when handling {{resourceOffers}}, however it seems tractable for this to only happen when a task is actually scheduled.  Context: the scheduler stores host attributes to satisfy scheduling constraints (like host/rack diversity).  Doing this would allow us to avoid waiting for the storage write lock, and handle {{resourceOffers}} in a more deterministic time frame.

One caveat with this approach is that the Offer would need to be plumbed into {{SchedulingFilterImpl}} in a way so as to ensure that the attributes are available for the offer being inspected.  In other words, we need to avoid the chicken and egg of trying to read the attributes for a host when this is the first offer ever received for it.



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