FlowNode node = deserializeBase64( mapNodeState, jobConf, BaseFlowNode.class );
Tap source = BaseFlowStep.getTapForID( node.getSourceTaps(), jobConf.get( "cascading.step.source" ) );
streamGraph = new HadoopMapStreamGraph( currentProcess, node, source );
for( Duct head : streamGraph.getHeads() )
LOG.info( "sourcing from: " + ( (ElementDuct) head ).getFlowElement() );
for( Duct tail : streamGraph.getTails() )