[jira] [Created] (HBASE-21395) Abort split/merge procedure if there is a table procedure of the same table going on

["Allan Yang (JIRA)" <ji...@apache.org>]

Allan Yang created HBASE-21395:
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             Summary: Abort split/merge procedure if there is a table procedure of the same table going on
                 Key: HBASE-21395
                 URL: https://issues.apache.org/jira/browse/HBASE-21395
             Project: HBase
          Issue Type: Sub-task
    Affects Versions: 2.0.2, 2.1.0
            Reporter: Allan Yang
            Assignee: Allan Yang


In my ITBLL, I often see that if split/merge procedure and table procedure(like ModifyTableProcedure) happen at the same time, and since there some race conditions between these two kind of procedures,  causing some serious problems. e.g. the split/merged parent is bought on line by the table procedure or the split merged region making the whole table procedure rollback.
Talked with [~Apache9] offline today, this kind of problem was solved in branch-2+ since There is a fence that only one RTSP can agianst a single region at the same time.
To keep out of the mess in branch-2.0 and branch-2.1, I added a simple safe fence in the split/merge procedure: If there is a table procedure going on against the same table, then abort the split/merge procedure. Aborting the split/merge procedure at the beginning of the execution is no big deal, compared with the mess it will cause...




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