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https://issues.apache.org/jira/browse/HBASE-25092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bo Cui updated HBASE-25092:
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Status: Patch Available (was: Open)
> RSGroupBalancer#assignments lost some regionPlans
> -------------------------------------------------
>
> Key: HBASE-25092
> URL: https://issues.apache.org/jira/browse/HBASE-25092
> Project: HBase
> Issue Type: Bug
> Components: rsgroup
> Affects Versions: 2.2.3, 2.3.1
> Reporter: Bo Cui
> Assignee: Bo Cui
> Priority: Major
>
> https://github.com/apache/hbase/blob/b2f2c79d8fa18fb691e669419004cc5168b0838d/hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java#L216
> when fallback is enabled, servers does not contain the current group's rs,
> and contains the rs of other group, region will be assigend to other group,
> but assignments already contains targetRS, and then assignments.putAll
> overwrites old entry
> {code:java}
> this.internalBalancer.retainAssignment(currentAssignmentMap, candidateList)
> .forEach((serverName, regionInfos) -> {
> assignments.computeIfAbsent(serverName, s -> new
> ArrayList<>())
> .addAll(regionInfos);
> });
> {code}
> the issue exists only in the branch-2.
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