[jira] [Created] (ACCUMULO-2272) Refactor metadata operations into a common API

["Christopher Tubbs (JIRA)" <ji...@apache.org>]

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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