Sorry I reread what I've written so far and found that it doesn't state the actual problem very well. Let me clarify once again:
The problem we're trying to solve is that we can't let messages go for unbounded amounts of time without getting processed, and it seems that something about what we're doing (which I suspect is the fact that consumers own several partitions but only consume from one of them at a time until it's caught up) is causing a small number of them to sit around for hours and hours. This is despite some consumers idling due to being fully caught up on the partitions they own. We've found that requeueing the oldest messages (consumers ignore messages that have already been processed) is fairly effective in getting them to go away, but I'm looking for a more stable solution.
On Sunday, August 25, 2013 at 1:15 PM, Ian Friedman wrote: