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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14456) Implement a namespace-based region grouping strategy for RegionGoupingProvider
Date Mon, 21 Sep 2015 14:35:04 GMT
Yu Li created HBASE-14456:
-----------------------------

             Summary: Implement a namespace-based region grouping strategy for RegionGoupingProvider
                 Key: HBASE-14456
                 URL: https://issues.apache.org/jira/browse/HBASE-14456
             Project: HBase
          Issue Type: New Feature
    Affects Versions: 2.0.0, 1.3.0
            Reporter: Yu Li
            Assignee: Yu Li


In HBASE-5699 we introduced multiple wal, and after some succeeding works we now have two
main kinds of wal providers: DefaultWALProvider and RegionGroupingProvider, while DefaultWALProvider
supplies a _single_ wal per regionserver, RegionGroupingProvider supplies _multiple_ wals
according to the RegionGroupingStrategy it's using.

Now there're two kinds of RegionGroupingStrategy: _identity_ and _bounded_, in which "identity"
only for testing (trial) purpose and "bounded" for randomly assigning region writes to bounded
number of wals. Although the "bounded" strategy is good enough for IO leverage, we may still
want a more "designed" way to distribute the region writes, like having one wal group per
business.

Since we already have namespace for multi-tenancy, it would be good to have namespace-based
grouping strategy, and this is exactly what this JIRA is for.

There might be more benefits if we have namespace-based wal group, like only replicating data
for the namespace in need w/o filtering anything useless, or only force region flush for the
heavy loaded namespace, etc. although we  won't include all these in this single JIRA.



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