[GitHub] [helix] narendly commented on issue #343: Fine-grained state transition throttling and respect MIN_ACTIVE replica

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narendly commented on issue #343: Fine-grained state transition throttling and respect MIN_ACTIVE replica 
URL: https://github.com/apache/helix/issues/343#issuecomment-512928795
 
 
   The root cause for this problem is because we throttle things at partition granularity. For example, if Helix determines that a partition needs recovery balance, then it will subject all of its replicas to the recovery balance throttle config (although some replicas for the same partition might be undergoing load balance - these replicas will still be subject to recovery throttle, which is incorrect!).
   
   Enabling Helix to throttle at replica granularity will solve this problem.
   
   Hope this helps,
   Hunter 
   
   ⁣Sent from BlueMail ​
   
   On Jul 18, 2019, 20:04, at 20:04, Yi Wang <no...@github.com> wrote:
   >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.
   >
   >-- 
   >You are receiving this because you are subscribed to this thread.
   >Reply to this email directly or view it on GitHub:
   >https://github.com/apache/helix/issues/343#issuecomment-512924648
   

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