// get handle to roller in dfo log roller to provide data
AgentFailChainSink afcs = (AgentFailChainSink) snk.getSink();
BackOffFailOverSink bofos = (BackOffFailOverSink) ((CompositeSink) afcs.snk)
.getSink();
DiskFailoverDeco dfo = (DiskFailoverDeco) bofos.getBackup();
DiskFailoverManager dfm = dfo.getFailoverManager();
RollSink dfoWriter = dfo.getDFOWriter();
dfoWriter.rotate(); // allow dfo retry thread to go.
// give data some time to show up.
Clock.sleep(1000);
c1Src.next();