[jira] [Created] (HBASE-14456) Implement a namespace-based region grouping strategy for RegionGoupingProvider

["Yu Li (JIRA)" <ji...@apache.org>]

Yu Li created HBASE-14456:
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             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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