The documentation at http://archive.cloudera.com/cdh/3/flume-ng/FlumeUserGuide.html indicates that there is a Round_robin_backoff but this threw an error. It looks like there is a constant with this type defined in code, but it is not used anywhere. The code seemed to indicate that the below should achieve a backoff for Round Robin though there is not documentation about the processor.backoff parameter. Is the below the right way to perform a round robin with backoff?
agent1.sinkgroups = group1
agent1.sinkgroups.group1.sinks = avroSink1 avroSink2
agent1.sinkgroups.group1.processor.type = load_balance
agent1.sinkgroups.group1.processor.selector = ROUND_ROBIN
agent1.sinkgroups.group1.processor.backoff = true