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Posted to issues@hbase.apache.org by "chaijunjie (Jira)" <ji...@apache.org> on 2026/07/31 10:03:00 UTC

[jira] [Comment Edited] (HBASE-30303) Regions can not balance when enable rsgroup fallback and all regionservers dead in one group

    [ https://issues.apache.org/jira/browse/HBASE-30303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18100709#comment-18100709 ] 

chaijunjie edited comment on HBASE-30303 at 7/31/26 10:02 AM:
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[~mazhengxuan] great！let me assgin to you～


was (Author: JIRAUSER286971):
[~mazhengxuan]great！let me assgin to you～

> Regions can not balance when enable rsgroup fallback and all regionservers dead in one group
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-30303
>                 URL: https://issues.apache.org/jira/browse/HBASE-30303
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 2.6.6
>            Reporter: chaijunjie
>            Assignee: mazhengxuan
>            Priority: Major
>         Attachments: HBASE-30303.png
>
>
> With RSGroup fallback enabled, a table may belong to an RSGroup that has no online RegionServers. Its regions are therefore assigned to the default RSGroup, or to any available RegionServer if the default group also has no online servers.
> The regions remain available on these fallback servers. However, *during every balance run, RSGroupBasedLoadBalancer validates their current locations only against the table’s original RSGroup.* *Because that group still has no online RegionServers, all fallback-hosted regions are classified as misplaced. The balancer then creates region move plans with no explicit destination, causing the regions to be randomly reassigned among the fallback candidates*. The same process repeats on every balance run, resulting in continuous and unnecessary region movement even when the fallback servers are already balanced.



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