[jira] [Created] (HBASE-25635) CandidateGenerator may miss some region balance actions

["Xiaolin Ha (Jira)" <ji...@apache.org>]

Xiaolin Ha created HBASE-25635:
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             Summary: CandidateGenerator may miss some region balance actions
                 Key: HBASE-25635
                 URL: https://issues.apache.org/jira/browse/HBASE-25635
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 2.0.0
            Reporter: Xiaolin Ha
            Assignee: Xiaolin Ha


{color:#172b4d}In codes of CandidateGenerator#getAction()，valid region index are greater or equal to zero. Currently only regions with greater than zero indexes can get balance actions.{color}
{code:java}
protected BaseLoadBalancer.Cluster.Action getAction(int fromServer, int fromRegion,
    int toServer, int toRegion) {
  if (fromServer < 0 || toServer < 0) {
    return BaseLoadBalancer.Cluster.NullAction;
  }
  if (fromRegion > 0 && toRegion > 0) {
    return new BaseLoadBalancer.Cluster.SwapRegionsAction(fromServer, fromRegion,
      toServer, toRegion);
  } else if (fromRegion > 0) {
    return new BaseLoadBalancer.Cluster.MoveRegionAction(fromRegion, fromServer, toServer);
  } else if (toRegion > 0) {
    return new BaseLoadBalancer.Cluster.MoveRegionAction(toRegion, toServer, fromServer);
  } else {
    return BaseLoadBalancer.Cluster.NullAction;
  }
}{code}
 



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