[jira] [Created] (HELIX-711) Allow downward state transition during recovery and add recovery threshold

["Hunter L (JIRA)" <ji...@apache.org>]

Hunter L created HELIX-711:
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             Summary: Allow downward state transition during recovery and add recovery threshold
                 Key: HELIX-711
                 URL: https://issues.apache.org/jira/browse/HELIX-711
             Project: Apache Helix
          Issue Type: Improvement
            Reporter: Hunter L


# Previously, a single partition requiring recovery balance would block all types of load-balance. This commit allows all downward state transitions (load balance) to happen even when recovery balance is happening in the same cycle.
 # As for non-downward state transitions load-balance, a parameter, ErrorOrRecoveryPartitionThresholdForLoadBalance, was added to ClusterConfig. If the number of partitions requiring recovery is lower than the threshold, non-downward load-balance will take place in the same cycle as recovery balance; otherwise, non-downward load-balance will not take place in the same cycle.



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