Hunter L created HELIX-793:
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             Summary: TASK: Make TaskAssigner honor instance constraints
                 Key: HELIX-793
                 URL: https://issues.apache.org/jira/browse/HELIX-793
             Project: Apache Helix
          Issue Type: Improvement
            Reporter: Hunter L
            Assignee: Hunter L


Previously, ThreadCountBasedTaskAssigner was assigning to all 
AssignableInstances. This could potentially be problematic because some users 
may wish to use InstanceGroupTags, in which case we must filter out instances 
that do not have the appropriate tags. This RB adds a logic that helps 
TaskAssigner honor such constraints.
 
 Changelist:
 1. TaskAssigner only assigns to AssignableInstances contained in eligible 
instances
 2. Add a test for this logic change



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