idea开发hadoop配置

1.环境准备

windows下的hadoop下载，
hadoop的环境变量的配置
java安装和环境变量的配置
maven的安装以及环境变量配置
idea的安装完成

2：新建项目

3：pom.xml修改

<hadoop.version>2.7.6</hadoop.version>


junit
junit
4.11
test

<!--hadoop开发依赖核心-->
<dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-client</artifactId>
  <version>${hadoop.version}</version>
</dependency>
<dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-common</artifactId>
  <version>${hadoop.version}</version>
</dependency>
<dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-hdfs</artifactId>
  <version>${hadoop.version}</version>
</dependency>

`

4:将集群中hadoop配置文件夹下的log4j.properties 和 core-site.xml和hdfs-site.xml下载到本地并复制到文件复制到项目resources目录

5:加入hadoop的jar包

6：集群启动：

zkServer.sh start
start-dfs.sh
start-yarn.sh

7：web验证

web端查看集群状态：默认端口50070
https://ip:50070

8：idea开发验证

public class ConnectionHadoop {
    public static void main(String[] args) {
            ConnectionHadoop.hdfsutils();
    }

    public static void hdfsutils() {
        try {
            Configuration conf = new Configuration();
            FileSystem fS = FileSystem.get(new URI("hdfs://192.168.2.101:9000"), conf ,"hadoop");
            Path path = new Path("hdfs://192.168.2.101:9000/home/hadoop/testTxt");
            if (fS.exists(path)) {
                System.out.println("path is exists");
            } else {
                fS.create(path);
                System.out.println("create successed");
            }

        } catch (Exception e) {
            System.out.println(e);
        }
    }
}