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https://issues.apache.org/jira/browse/HBASE-25093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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niuyulin resolved HBASE-25093.
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Resolution: Fixed
> the RSGroupBasedLoadBalancer#retainAssignment throws NPE
> --------------------------------------------------------
>
> Key: HBASE-25093
> URL: https://issues.apache.org/jira/browse/HBASE-25093
> Project: HBase
> Issue Type: Bug
> Components: rsgroup
> Affects Versions: 3.0.0-alpha-1, 2.3.1, 2.2.3
> Reporter: Bo Cui
> Assignee: niuyulin
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.3, 2.4.0, 2.2.7
>
>
> when BaseLoadBalancer#
> https://github.com/apache/hbase/blob/8bfa2cb2eedcf050b26a28961e1b77dbf3cd8c95/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java#L1433
> If the result of the BaseLoadBalancer#retainAssignment is null, the
> RSGroupBasedLoadBalancer#retainAssignment will throw NPE.
> https://github.com/apache/hbase/blob/8bfa2cb2eedcf050b26a28961e1b77dbf3cd8c95/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java#L206
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