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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原文链接:https://my.oschina.net/zc741520/blog/410645