hadoop中怎么将文件上传到指定datanode

这期内容当中小编将会给大家带来有关hadoop中怎么将文件上传到指定datanode，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

package hgs.dfsclient.test;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.fs.CreateFlag;import org.apache.hadoop.fs.Path;import org.apache.hadoop.fs.permission.FsCreateModes;import org.apache.hadoop.fs.permission.FsPermission;import org.apache.hadoop.hdfs.DFSClient;import org.apache.hadoop.hdfs.DFSOutputStream;import org.apache.hadoop.hdfs.protocol.*;import java.io.File;import java.io.IOException;import java.net.InetSocketAddress;import java.net.URI;import java.net.URISyntaxException;import java.util.EnumSet;import java.util.List;import java.util.Random;public class MainTest {    public static void main(String[] args) throws IOException, URISyntaxException {        Configuration conf =  new Configuration();        conf.addResource(new File("D://hdfsconf/core-site.xml").toURI().toURL());        conf.addResource(new File("D://hdfsconf/hdfs-site.xml").toURI().toURL());        String url = conf.get("fs.defaultFS");        System.out.println(url);        Path path = new Path("/user/test.txt");        DFSClient client = new DFSClient(new URI("hdfs://192.168.0.191:9000/"),conf);        //favor datanode        InetSocketAddress [] favor = {new InetSocketAddress("192.168.0.191", 50012)};        createAndFillFile(client,conf,favor,"/user/test.txt4");        listBlockLocation(client, conf, "/user/test.txt4",true );        client.close();    }        //将数据传输到指定的datanode    public static void createAndFillFile(DFSClient client,Configuration conf,                                         InetSocketAddress [] favor,String src) throws IOException {        DFSOutputStream dfsOutputStream = client.create(src, FsCreateModes.applyUMask(                FsPermission.getFileDefault(), FsPermission.getUMask(conf)), EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),                true, (short) 1, 32 * 1024 * 1024,                null, 8192, null, favor, null);        byte[] b = new byte[1024*3*3];        for(int i = 0 ;i<100000;i++){            fileByte(b);            dfsOutputStream.write(b);        }        dfsOutputStream.close();    }    static Random rand = new Random(System.nanoTime());    public static void fileByte(byte[] b){        if(b != null ){            rand.nextBytes(b);        }    }        //获取文件的block位置    public static void listBlockLocation(DFSClient client,Configuration conf,String src,boolean needLocation) throws IOException {        DirectoryListing directoryListing = client.listPaths(src, HdfsFileStatus.EMPTY_NAME,                needLocation);        HdfsFileStatus[] fileStatuses = directoryListing.getPartialListing();        for(int i=0 ; i <fileStatuses.length ; i++){            HdfsLocatedFileStatus hl = (HdfsLocatedFileStatus)fileStatuses[i];            LocatedBlocks locatedBlocks = hl.getLocatedBlocks();            List<LocatedBlock> locatedBlocks1 = locatedBlocks.getLocatedBlocks();            for(LocatedBlock lb : locatedBlocks1 ){                DatanodeInfo[] locations = lb.getLocations();                for(DatanodeInfo li : locations){                    System.out.println("addr:"+li.getIpAddr()+"--port:"+li);                }            }        }    }}

上述就是小编为大家分享的hadoop中怎么将文件上传到指定datanode了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注编程网精选频道。