Questions on Slice for OpenJPA

[Andy Schlaikjer <ha...@cs.cmu.edu>]

Hi all,

While familiarizing myself with OpenJPA I found Pinaki Poddar's blog on 
the Dev2Dev site, and had a few questions on his new project Slice. In 
case there are other Slice users lurking here I thought I'd post to this 
list.

Pinaki mentions that queries are performed by Slice across all delegates 
in parallel. My application may require many slices, perhaps as many as 
100. In this case, what will the threading model look like? Will the 
ratio of threads to delegates be 1:1? It might be advantageous to expose 
configuration of the threading policy and/or work queues in this situation.

For the most part, I've been using "GenerationType.IDENTITY" for my 
entity ids. I didn't find mention of this in Slice documentation, but I 
imagine that id generation would have to be coordinated across all 
slices, so queries on entity id alone would work as intended. How should 
id generation be handled in applications taking advantage of Slice?

Cheers,
Andy