i3wangyi commented on issue #343: Fine-grained state transition throttling and 
respect MIN_ACTIVE replica 
URL: https://github.com/apache/helix/issues/343#issuecomment-512924648
 
 
   I feel like we need to put more background knowledge and context on the 
topic. For example, why Helix will treat the previous ongoing offline -> slave 
as recovery balance given it was kicked off as load balance. One naive 
question, I understand the current limitation is **helix controller doesn't 
know the historical context about any ongoing state transitions in a 
participant** (is it true). Is it because of the **state transition message for 
the participant** get consumed? What if we preserve the pending message until 
completion and controller would be able to know the historical context? pros 
and cons? 
   
   Let's put more background and context of the problem to have a meaningful 
discussion.

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