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From "Ed Kohlwey (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1551) Introduce Generic Supertypes to Replace Text
Date Fri, 05 Jul 2013 03:43:50 GMT
Ed Kohlwey created ACCUMULO-1551:
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             Summary: Introduce Generic Supertypes to Replace Text
                 Key: ACCUMULO-1551
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1551
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Ed Kohlwey


I wanted to create a new ticket for my thoughts on this. I'd like to introduce a paradigm
similar to the object inspectors used in HIVE to get data in and out of accumulo.

The base motivation for this is that the accumulo API is inconsistent. It is difficult to
use for application developers and creates a lot of confusion to new developers because of
the inconsistent use of Text, CharSequence, and byte[] for representing various parts of the
keys. This is totally unnecessary and is in my mind a huge black eye.

Aside from providing a mechanism that could eventually be used to increase read performance
in the client, this would also provide a simpler paradigm for application developers and would
accomplish some aspects of ORM, a-la the Typo and Gora (although distinct from the goals and
scope of Gora).

I've attached an initial patch outlining how I think the refactoring would work in scanner.
Basically, the old API would be preserved by introducing generic supertypes, and a class that
allows serialization directly from the ByteSequence objects.

While it may be true that some people have highly heterogenous data in their table, the worst
case scenario here is that you just use the ByteSequences directly. This will, however, allow
substantially simpler access even in that base case by making the access pattern consistent.
In other cases, where a scan is only done over a particular column, or the data is very heterogenous,
the benefit is even greater.

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