hadoop cluster configuration sequential priority

First, the priority code 

Second, maven project's resource folder .xml configuration file

Third, modify server configuration

Fourth, the default configuration

 

Code modification example of the configuration

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.Test;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

public class HDFSClientTest {
    @Test
    public void copyFromLocal() throws URISyntaxException, IOException, InterruptedException {
        Configuration conf = new Configuration();

        conf.set("dfs.replication","2");//修改配置，设置副本数。
        FileSystem fileSystem = FileSystem.get(new URI("hdfs://hadoop112:9000"), conf, "angel");

        fileSystem.copyFromLocalFile(new Path("/home/angel/software/apache-maven-3.6.2-bin.tar.gz"),new Path("/"));

        fileSystem.close();
    }

}