There’s movement in the realtime NoSQL world. As GigaOm reports in Yahoo Open-Sources Real-Time MapReduce, Yahoo! is the first to release a large scale implementation of a more realtime oriented NoSQL system (don’t think it’s Hadoop or even MapReduce based), which will allow to query data pretty much as it’s added to the system. Or as the S4 project describes it:
S4 is a general-purpose, distributed, scalable, partially fault-tolerant, pluggable platform that allows programmers to easily develop applications for processing continuous unbounded streams of data.
All of that on the heels of Google’s changes related to, or at least coinciding with, the introduction of Google Instant.