Commits on Jan 18, 2022

1. Treat unassigned leases (as well as expired ones) as available-to-be-… …

   …taken
   
   If a lease is 'unassigned' (it has no lease owner) then it should be
   considered available for taking in `DynamoDBLeaseTaker`. Prior to this
   change, the only ways `DynamoDBLeaseTaker` could take leases for a
   scheduler was either by incremental lease stealing, or waiting for the
   lease to expire by not having been updated in `failoverTimeMillis` - which
   could be slow if `failoverTimeMillis` was set reasonably high (with it set
   to just 30s, I've seen new instances take over 3 minutes to take all leases
   from old instances in a deployment).
   
   This would be one half of the a fix for
   awslabs#845 - the other
   half of the fix is invoking `evictLease()` (setting the lease owner to
   null) on graceful shutdown of a scheduler.

   

   rtyley committed Jan 18, 2022
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