fluent/fluentd — pull request #245 by tagomoris (2013-12-29 13:21:18+00:00)
Title: Select writer threads by round-robin

At submit_buffer, fixed writer selection makes throughput bottleneck.
Fix to select a writer by rough round-robin,
* to reduce bottlenecks
* not to reduce performance without locks

What is important is to select a different writer from previous submits, not to select "strictly next" writer.
That is why this patch doesn't include locks.