[jira] [Commented] (HBASE-9514) Prevent region from assigning before log splitting is done

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764932#comment-13764932 ] 

Jimmy Xiang commented on HBASE-9514:
------------------------------------

I was thinking about saving the previous region server of a region in its region state. Whenever a region is transitioning to open, master checks if its previous host region server is known to be dead but not null. If so, aborting the open. The previous region server will be cleared only after SSH finishes log splitting, or master restarts of course.
                
> Prevent region from assigning before log splitting is done
> ----------------------------------------------------------
>
>                 Key: HBASE-9514
>                 URL: https://issues.apache.org/jira/browse/HBASE-9514
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>
> If a region is assigned before log splitting is done by the server shutdown handler, the edits belonging to this region in the hlogs of the dead server will be lost.
> Generally this is not an issue if users don't assign/unassign a region from hbase shell or via hbase admin. These commands are marked for experts only in the hbase shell help too.  However, chaos monkey doesn't care.
> If we can prevent from assigning such regions in a bad time, it would make things a little safer.

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