jid = oper.getMapReduce().getJobId();
if (!subgraphs.containsKey(jid)) {
Graph g = new Graph();
g.id("cluster_" + jid.replaceAll("-", ""));
g.attr("bgcolor", BG_CLUSTER);
Style s = new Style();
s.attr("rounded");
s.attr("filled");
g.style(s);
subgraphs.put(jid, g);
}
subgraphs.get(jid).node(node);
return false;