{
Context ctx = ZMQ.context(1);
Socket sock = ctx.socket(ZMQ.DEALER);
ZLog zlog = ZLogManager.instance().get(topic);
long offset = zlog.offset();
String data = "hello";
System.out.println("previous offset " + zlog.path().getAbsolutePath() + ":" + offset);
sock.setIdentity(ZPUtils.genTopicIdentity(topic, 0));