Why do you need to reduce those docs? In this particular exmple, you
can do a range query on the key and get the same (basically) results.
Also, I think the growth rate for reduce functions is log(rows) - so
reducing the view size by 50% is still going to run up against the
limit.
On May 19, 2011, at 9:41 PM, Jim Klo wrote:
I'm a little dumbfounded by reduce functions.
What I'm trying to do is take a view that has heterogeneous values
and union into a single object; logically this seems like what the
reduce function should be capable of doing, but it seems I keep
getting the reduce overflow error. Effectively I'm reducing the view
by 50%.
Consider the the simplistic scenario:
doc A: { _id : "abc123", type:"resource", keyword:"nasa" }
doc B: { _id : "abc123-timestamp", type: "timestamp", timestamp:
"2011/05/19T12:00:00.0000Z", ref_doc: "abc123" }
doc N: ....
Doc A is the original doc... Doc B is the timestamp doc referencing
Doc A via ref_doc field... Doc N is just another doc also
referencing Doc A via ref_doc field.
I can create a view that essentially looks like:
Key Value
------------ ------------------
"abc123" { .... doc A object .... }
"abc123" { .... doc B object .... }
"abc123" { .... doc N object .... }
I would expect I could build a reduced view that looks something
like this:
Key Value
------------ ------------------
"abc123" { .... merged doc .... }
Ultimately this goes back to an issue we have where we need the node
local timestamp of a document, without generating an event that
would cause an update to doc A, causing it to get replicated. We
figure we can store local data like a timestamp then join it back
with the original doc via a view & list.
Is there something magical about the reduce that's not well
documented? Or maybe is there a better way to do this? I know about
using linked docs, were in my map function you can reference the _id
of the linked document in the value you can return @ 1 - 1 merge
with the include_docs=true, but don't think I can do that with N
docs; or can I?
Jim Klo
Senior Software Engineer
Center for Software Engineering
SRI International
