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https://issues.apache.org/jira/browse/HBASE-29364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhiwen Deng updated HBASE-29364:
--------------------------------
    Description: 
We have encountered multiple instances where regions were opened on 
RegionServers (RS) that had already been offlined. It wasn't until recently 
that we discovered a potential cause for this issue, and the details of the 
problem are as follows:
Our HDFS storage reached the online level, which caused the upper-level master 
and rs to be unable to write and abort. Finally, we manually accessed and 
deleted some data, and HDFS was restored. Then the hbck report showed that some 
regions were opened on the offline rs, which caused these regions to be unable 
to server. We finally used hbck2 to assigns these regions, and the problem was 
solved.
 

> Region will be opened in unknown regionserver when master is changed & rs 
> crashed
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-29364
>                 URL: https://issues.apache.org/jira/browse/HBASE-29364
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 2.3.0
>            Reporter: Zhiwen Deng
>            Priority: Major
>
> We have encountered multiple instances where regions were opened on 
> RegionServers (RS) that had already been offlined. It wasn't until recently 
> that we discovered a potential cause for this issue, and the details of the 
> problem are as follows:
> Our HDFS storage reached the online level, which caused the upper-level 
> master and rs to be unable to write and abort. Finally, we manually accessed 
> and deleted some data, and HDFS was restored. Then the hbck report showed 
> that some regions were opened on the offline rs, which caused these regions 
> to be unable to server. We finally used hbck2 to assigns these regions, and 
> the problem was solved.
>  



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