I'm new to Kafka and I'm trying to understand the version semantics. We want to use Kafka w/ Spark but our version of Spark is tied to 0.8.0. We were wondering what guarantees are made about backwards compatbility across 0.8.x.x. At first glance, given the 3 digits used for versions, I figured 0.8.x would be a bugfix and fully version-compatible but I'm noticing newer versions released w/ 4 digits which leads me to beleave there are less guarantees between 0.8.0, 0.8.1.x and 0.8.2.x.
