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https://issues.apache.org/jira/browse/HBASE-20368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432625#comment-16432625
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stack commented on HBASE-20368:
-------------------------------

[~Xiaolin Ha] May we see log showing the problem you describe?

{quote}
This error can be reproduced by shutting down all servers in a rsgroups and 
starting them soon afterwards. 
The regions on this rsgroup will be reassigned, but there is no available 
servers of this rsgroup.
They will be added to AM's pendingAssginQueue, which AM will clear regardless 
of the result of assigning in this case.
{quote}

Please help me understand '...regions on this rsgroup will be reassigned, but 
there is no available servers of this rsgroup....'. We just restarted the 
servers so why no available servers? (And IIRC, RSGroups identifies servers 
'generally', with port and name rather than with port, name, and startcode.. so 
why does it not find the restarted servers?)

bq. They will be added to AM's pendingAssginQueue, which AM will clear 
regardless of the result of assigning in this case.

We clear from pendingAssignQ whether failed or success?

Thanks.

> Fix RIT stuck when a rsgroup has no online servers but AM's 
> pendingAssginQueue is cleared
> -----------------------------------------------------------------------------------------
>
>                 Key: HBASE-20368
>                 URL: https://issues.apache.org/jira/browse/HBASE-20368
>             Project: HBase
>          Issue Type: Bug
>          Components: rsgroup
>    Affects Versions: 2.0.0
>            Reporter: Xiaolin Ha
>            Assignee: Xiaolin Ha
>            Priority: Major
>         Attachments: HBASE-20368.branch-2.0.001.patch
>
>
> This error can be reproduced by shutting down all servers in a rsgroups and 
> starting them soon afterwards. 
> The regions on this rsgroup will be reassigned, but there is no available 
> servers of this rsgroup.
> They will be added to AM's pendingAssginQueue, which AM will clear regardless 
> of the result of assigning in this case.



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