Abstractions at Scale–Our Experiences at Twitter
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Marius Eriksen works on systems infrastructure at Twitter. Prior to that he architected Mixer Labs' GeoAPI.com database services, and worked on systems infrastructure at Google.
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JPA as 'dishonest abstraction'
by
Pinaki Poddar
JPA is *not* an abstraction. It is a View in a classic MVC design pattern. The model being good, old RDBMS. A view is *not* an abstraction of a model. Nor is JPA or ORM is an abstraction of RDBMS.
Like many other views, JPA presents the user an 'object-oriented' view of a relational database. Like any other views, JPA does not substitute or abstract the underlying model, just provides yet another perspective to a model and one takes (or rejects) a view purely based on their world view.
For a Java developer dealing with a complex graph like domain model, yes, there is some definite advantage of taking a JPA view of a relational schema.
For a batch upload of million flat records from a CSV file -- JPA brings nothing to the table.
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