从java获取HDFS的文件夹大小

Question

我必须使用具有java子目录的HDFS文件夹大小.

从命令行我们可以使用-dus选项,但是任何人都可以帮助我如何使用java获得相同的功能.

Answer 1

类中的getSpaceConsumed()函数ContentSummary将返回文件/目录在集群中占用的实际空间,即它考虑了为集群设置的复制因子.

例如,如果hadoop集群中的复制因子设置为3,目录大小为1.5GB,则该getSpaceConsumed()函数将返回4.5GB的值.

使用类中的getLength()函数ContentSummary将返回实际的文件/目录大小.

Answer 2

您可以使用getContentSummary(Path f)该类提供的方法FileSystem.它返回一个可以调用该方法的ContentSummary对象getSpaceConsumed(),它将为您提供以字节为单位的目录大小.

用法:

package org.myorg.hdfsdemo;

import java.io.IOException;

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

public class GetDirSize {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub

        Configuration config = new Configuration();
        config.addResource(new Path(
                "/hadoop/projects/hadoop-1.0.4/conf/core-site.xml"));
        config.addResource(new Path(
                "/hadoop/projects/hadoop-1.0.4/conf/core-site.xml"));
        FileSystem fs = FileSystem.get(config);
        Path filenamePath = new Path("/inputdir");
        System.out.println("SIZE OF THE HDFS DIRECTORY : " + fs.getContentSummary(filenamePath).getSpaceConsumed());
    }

}

HTH

Answer 3

谢谢你们。

斯卡拉版本

package com.beloblotskiy.hdfsstats.model.hdfs

import java.nio.file.{Files => NioFiles, Paths => NioPaths}
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.FileSystem
import org.apache.hadoop.fs.Path
import org.apache.commons.io.IOUtils
import java.nio.file.{Files => NioFiles}
import java.nio.file.{Paths => NioPaths}
import com.beloblotskiy.hdfsstats.common.Settings

/**
 * HDFS utilities
 * @author v-abelablotski
 */
object HdfsOps {
  private val conf = new Configuration()
  conf.addResource(new Path(Settings.pathToCoreSiteXml))
  conf.addResource(new Path(Settings.pathToHdfsSiteXml))
  private val fs = FileSystem.get(conf)

  /**
   * Calculates disk usage with replication factor.
   * If function returns 3G for folder with replication factor = 3, it means HDFS has 1G total files size multiplied by 3 copies space usage.
   */
  def duWithReplication(path: String): Long = {
    val fsPath = new Path(path);
    fs.getContentSummary(fsPath).getSpaceConsumed()
  }

  /**
   * Calculates disk usage without pay attention to replication factor.
   * Result will be the same with hadopp fs -du /hdfs/path/to/directory 
   */
  def du(path: String): Long = {
    val fsPath = new Path(path);
    fs.getContentSummary(fsPath).getLength()
  }

  //...
}