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今天就跟大家聊聊有关Storm中DRPC如何使用,可能很多人都不太了解,为了让大家更加了解,小编给大家总结了以下内容,希望大家根据这篇文章可以有所收获。
1. 修改所有节点的 storm.yaml 配置文件,设置 drpc server
[grid@hadoop6 ~]$ vim storm-0.9.4/conf/storm.yaml drpc.servers: - "hadoop4"
2. 启动drcp服务
storm drpc &
3. 编写服务端程序
//来源于 https://github.com/nathanmarz/storm-starter/blob/master/src/jvm/storm/starter/BasicDRPCTopology.java package storm.starter; import backtype.storm.Config; import backtype.storm.LocalCluster; import backtype.storm.LocalDRPC; import backtype.storm.StormSubmitter; import backtype.storm.drpc.LinearDRPCTopologyBuilder; import backtype.storm.topology.BasicOutputCollector; import backtype.storm.topology.OutputFieldsDeclarer; import backtype.storm.topology.base.BaseBasicBolt; import backtype.storm.tuple.Fields; import backtype.storm.tuple.Tuple; import backtype.storm.tuple.Values; public class BasicDRPCTopology { public static class ExclaimBolt extends BaseBasicBolt { @Override public void execute(Tuple tuple, BasicOutputCollector collector) { String input = tuple.getString(1); collector.emit(new Values(tuple.getValue(0), input + "!")); } @Override public 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)); } cluster.shutdown(); drpc.shutdown(); } else { conf.setNumWorkers(3); StormSubmitter.submitTopology(args[0], conf, builder.createRemoteTopology()); } } }
4. 将程序打包提交到Storm集群
storm jar Storm04-1.0-SNAPSHOT.jar storm.starter.BasicDRPCTopology exclamation
5. 编写客户端程序远程调用服务
import backtype.storm.utils.DRPCClient; public class Client { public static void main(String[] args) throws Exception { DRPCClient client = new DRPCClient("192.168.0.106", 3772); String[] words = {"hello", "storm", "drpc"}; for (String word : words) { String result = client.execute("exclamation", word); System.out.println("Result for \"" + word + "\": " + result); } } }
6. 程序运行结果:
看完上述内容,你们对Storm中DRPC如何使用有进一步的了解吗?如果还想了解更多知识或者相关内容,请关注亿速云行业资讯频道,感谢大家的支持。
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