我已经开始使用storm,所以我使用创建简单的拓扑本教程 https://github.com/nathanmarz/storm/wiki/Tutorial
当我运行我的拓扑时LocalCluster
一切看起来都很好,
我的问题是我没有得到元组的确认,这意味着我的喷嘴ack
从未被调用过。
我的代码如下 - 你知道为什么吗ack
不叫?
所以我的拓扑看起来像这样
public StormTopology build() {
TopologyBuilder builder = new TopologyBuilder();
builder.setSpout(HelloWorldSpout.class.getSimpleName(),
helloWorldSpout, spoutParallelism);
HelloWorldBolt bolt = new HelloWorldBolt();
builder.setBolt(HelloWorldBolt.class.getSimpleName(),
bolt, boltParallelism)
.shuffleGrouping(HelloWorldSpout.class.getSimpleName());
}
我的喷嘴看起来像这样
public class HelloWorldSpout extends BaseRichSpout implements ISpout {
private SpoutOutputCollector collector;
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("int"));
}
public void open(Map conf, TopologyContext context,
SpoutOutputCollector collector) {
this.collector = collector;
}
private static Boolean flag = false;
public void nextTuple() {
Utils.sleep(5000);
//emit only 1 tuple - for testing
if (!flag){
this.collector.emit(new Values(6));
flag = true;
}
}
@Override
public void ack(Object msgId) {
System.out.println("[HelloWorldSpout] ack on msgId" + msgId);
}
public void fail(Object msgId){
System.out.println("[HelloWorldSpout] fail on msgId" + msgId);
}
}
我的螺栓看起来像这样
@SuppressWarnings("serial")
public class HelloWorldBolt extends BaseRichBolt{
private OutputCollector collector;
public void prepare(Map conf, TopologyContext context,
OutputCollector collector) {
this.collector = collector;
logger.info("preparing HelloWorldBolt");
}
public void execute(Tuple tuple) {
System.out.println("[HelloWorldBolt] got" + tuple.getInteger(0));
this.collector.ack(tuple);
}
public void cleanup() {
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
// TODO Auto-generated method stub
}
}