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https://issues.apache.org/jira/browse/HBASE-24676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154915#comment-17154915
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Mohammad Arshad commented on HBASE-24676:
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Default rsgroup can be updated only in memory, no need to update it in
hbase:rsgroup
Master branch has done this change in HBASE-22820 Jira which solves this issue.
> Meta region assignment is blocked when all RS in meta table group are
> restarted.
> --------------------------------------------------------------------------------
>
> Key: HBASE-24676
> URL: https://issues.apache.org/jira/browse/HBASE-24676
> Project: HBase
> Issue Type: Bug
> Components: rsgroup
> Affects Versions: 2.2.3
> Reporter: Mohammad Arshad
> Assignee: Mohammad Arshad
> Priority: Major
>
> This issue happened in a test cluster. The issue does not reproduce easily.
> But we can reproduce it with debug points in code.
> Steps to reproduce:
> # Install a HBase cluster with three RS(rs1,rs2 and rs3) and one Master
> # Create two rsgroups r1 and r2 and move rs1 to r1 and rs2 to r2
> {code}
> add_rsgroup 'r1';add_rsgroup 'r2';move_servers_rsgroup
> 'r1',['rs1Host:16020'];move_servers_rsgroup 'r2',['rs2Host:16020']
> {code}
> # Create a table t1
> {code}create 't1','f1','f2';put't1','r1','f1:c1','v1'{code}
> # Start debugging master, put debug point in while loop of
> {code}org.apache.hadoop.hbase.rsgroup.RSGroupInfoManagerImpl.ServerEventsListenerThread#run{code}
> method.
> # Stop rs3
> # When debug flow comes, wait around 30 seconds to let the meta be offline
> and then let the debug flow execute. By now meta will be offline as rs3 is
> stopped. HMaster UI will hang as meta is offline.
> # Now start rs3, after start meta should be online and Master UI should open.
> # No, still master UI hangs, then you have reproduced the issue.
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