cloudant/fabric — pull request #67 by davisp (2012-11-21 15:08:55+00:00)
Title: Throttle parallel doc lookup requests

When POSTing keys to _all_docs it would spawn N requests in parallel for
every key in the request. This can end up swapping the system pretty
quickly as demonstrated by some import scripts that clients were
running.

Simple fix just constrains the number of parallel requests to 10 and
issues new requests as others finish.