storm DRPC问题

一、配置集群storm.yaml文件，配置drpc.server。

二、开启drpc服务，storm drpc。

三、编写DrpcTopology程序。如下：

<span style="font-size:24px;">import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.LocalDRPC;
import org.apache.storm.StormSubmitter;
import org.apache.storm.drpc.LinearDRPCTopologyBuilder;
import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;/*** This topology is a basic example of doing distributed RPC on top of Storm. It implements a function that appends a* "!" to any string you send the DRPC function.** @see <a href="http://storm.apache.org/documentation/Distributed-RPC.html">Distributed RPC</a>*/
public class Drpc {public static class ExclaimBolt extends BaseBasicBolt {@Overridepublic void execute(Tuple tuple, BasicOutputCollector collector) {String input = tuple.getString(1);collector.emit(new Values(tuple.getValue(0), input + "!"));}@Overridepublic void declareOutputFields(OutputFieldsDeclarer declarer) {declarer.declare(new Fields("id", "result"));}}public static void main(String[] args) throws Exception {LinearDRPCTopologyBuilder builder = new LinearDRPCTopologyBuilder("exclamation");builder.addBolt(new ExclaimBolt(), 3);Config conf = new Config();if (args == null || args.length == 0) {LocalDRPC drpc = new LocalDRPC();LocalCluster cluster = new LocalCluster();cluster.submitTopology("drpc-demo", conf, builder.createLocalTopology(drpc));for (String word : new String[]{ "hello", "goodbye" }) {System.out.println("Result for \"" + word + "\": " + drpc.execute("exclamation", word));}}else {conf.setNumWorkers(3);StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createRemoteTopology());}}
}
</span>

<span style="font-size:24px;">import org.apache.storm.Config;
import org.apache.storm.utils.DRPCClient;
public class DrpcClient {public static void main(String[] args) throws Exception {Config conf=new Config();conf.setDebug(false);DRPCClient client=new DRPCClient(conf, "storm2", 3772);System.out.println(client.execute("exclamation", "hello"));}}</span>

改用storm 0.9.6api则没有问题，可以正常调用server。

<span style="font-size:24px;">import backtype.storm.utils.DRPCClient;
public class DrpcClient {public static void main(String[] args) throws Exception {DRPCClient client=new DRPCClient("storm2", 3772);System.out.println(client.execute("exclamation", "年后"));}}
</span>