Allan Yang commented on HBASE-21035:

If scheduling a SCP for servers with '-splitting' is not a good idea, then we 
can go around. Before HBASE-20708, there is a method called 
processofflineServersWithOnlineRegions which will schedule a assign procedure 
for any regions on a dead server. But after HBASE-20708 there isn't( replaced 
by processOfflineRegions). Can we just bring the logic in 
processofflineServersWithOnlineRegions back? What I want is the same behave w/ 
or wo/ HBASE-20708.

> Meta Table should be able to online even if all procedures are lost
> -------------------------------------------------------------------
>                 Key: HBASE-21035
>                 URL: https://issues.apache.org/jira/browse/HBASE-21035
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.1.0
>            Reporter: Allan Yang
>            Assignee: Allan Yang
>            Priority: Major
>         Attachments: HBASE-21035.branch-2.0.001.patch
> After HBASE-20708, we changed the way we init after master starts. It will 
> only check WAL dirs and compare to Zookeeper RS nodes to decide which server 
> need to expire. For servers which's dir is ending with 'SPLITTING', we assure 
> that there will be a SCP for it.
> But, if the server with the meta region crashed before master restarts, and 
> if all the procedure wals are lost (due to bug, or deleted manually, 
> whatever), the new restarted master will be stuck when initing. Since no one 
> will bring meta region online.
> Although it is an anomaly case, but I think no matter what happens, we need 
> to online meta region. Otherwise, we are sitting ducks, noting can be done.

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