Christopher Tubbs created ACCUMULO-2272:
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Summary: Refactor metadata operations into a common API
Key: ACCUMULO-2272
URL: https://issues.apache.org/jira/browse/ACCUMULO-2272
Project: Accumulo
Issue Type: Improvement
Reporter: Christopher Tubbs
Fix For: 1.7.0
We have a lot of code that updates/modifies entries in the metadata tables, and
provides metadata information for tablets to clients. It'd be better (code
readability, modifiability) if we could abstract these metadata operations into
a usable API, rather than have separate code spread out for the different kinds
of metadata (zookeeper for the root table, root table for the metadata tablets,
metadata table for user tablets).
A single API, with a factory to get the right implementation, depending on
which table's metadata is being manipulated, would be much easier to work with
and would help avoid bugs related to tablet management, updating table state,
etc.
A minimal API has been added (o.a.a.core.metadata.MetadataServicer) when the
root tablet was moved to its own table, as a starting point, but was not fully
leveraged due to time constraints.
To be clear, this improvement is entirely refactoring of internal code. User
experience should have no impact (unless it helps find/prevent bugs).
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