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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