[GitHub] [helix] dasahcc opened a new issue #343: Fine-grained state transition throttling and respect MIN_ACTIVE replica

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dasahcc opened a new issue #343: Fine-grained state transition throttling and respect MIN_ACTIVE replica 
URL: https://github.com/apache/helix/issues/343
 
 
   MIN_ACTIVE replica is only applied in DelayAutoRebalancer and not respected by throttling logic in Helix. Thus if preference list for partition is: Master, Slave, Slave and current state is Master, Slave, Offline. It will generate a state transition (ST) Offline -> Slave. Even if the MIN_ACTIVE replica number is 2, Helix will treat this Offline -> Slave to be Recovery rebalance. We should fix this.
   
   Also we need the logic to have more fine-grained state transition instead of marking all state transition of a partition to same state transition type. For example, the preference list is Master, Slave, Slave and current state is Slave, Slave, Offline. There will be two STs: Slave -> Master and Offline -> Slave. In current computation logic, they are all Recovery STs because this partition is marked as Recovery partition. With new logic, Slave -> Master is Recovery ST and Offline -> Slave will be Load rebalance when MIN_ACTIVE rebalance set to be 2.

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