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From "Stephen Yuan Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16488) Starting namespace and quota services in master startup asynchronizely
Date Wed, 24 Aug 2016 03:01:20 GMT
Stephen Yuan Jiang created HBASE-16488:
------------------------------------------

             Summary: Starting namespace and quota services in master startup asynchronizely
                 Key: HBASE-16488
                 URL: https://issues.apache.org/jira/browse/HBASE-16488
             Project: HBase
          Issue Type: Improvement
          Components: master
    Affects Versions: 1.2.2, 1.1.5, 1.0.3, 2.0.0, 1.3.0, 1.4.0
            Reporter: Stephen Yuan Jiang
            Assignee: Stephen Yuan Jiang


>From time to time, during internal IT test and from customer, we often see master initialization
failed due to namespace table region takes long time to assign (eg. sometimes split log takes
long time or hanging; or sometimes RS is temporarily not available; sometimes due to some
unknown assignment issue).  In the past, there was some proposal to improve this situation,
eg. HBASE-13556 / HBASE-14190 (Assign system tables ahead of user region assignment) or HBASE-13557
(Special WAL handling for system tables) or  HBASE-14623 (Implement dedicated WAL for system
tables).  

This JIRA proposes another way to solve this master initialization fail issue: namespace service
is only used by a handful operations (eg. create table / namespace DDL / get namespace API
/ some RS group DDL).  Only quota manager depends on it and quota management is off by default.
 Therefore, namespace service is not really needed for master to be functional.  So we could
start namespace service asynchronizely without blocking master startup.

 



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