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https://issues.apache.org/jira/browse/HBASE-25635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17295817#comment-17295817
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Xiaolin Ha commented on HBASE-25635:
------------------------------------
Thanks for your advice, [~vjasani].
Yes, my patch is similar to #2293.
I tested TestStochasticLoadBalancerHeterogeneousCost and also found the
failures, I'll try to resolve them. Thanks.
> 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
> Priority: Major
>
> {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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