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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