How to copy file from HDFS to the local file system

Question

How to copy file from HDFS to the local file system   There is no physical location of a file under the file   not even directory   how can i moved them to my local for further validations i am tried through winscp

User · Answer

This worked for me on my VM instance of Ubuntu   hdfs dfs -copyToLocal  hadoop directory    local directory

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If your source  file  is split up among multiple files  maybe as the result of map-reduce  that live in the same directory tree  you can copy that to a local file with   hadoop fs -getmerge  hdfs source dir root  local destination

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In order to copy files from HDFS to the local file system the following command could be run   hadoop dfs -copyToLocal  lt input gt   lt output gt     lt input gt   the HDFS directory path  e g  mydata  that you want to copy  lt output gt   the destination directory path  e g    Documents

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bin hadoop fs -get  hdfs source path  localfs destination path bin hadoop fs -copyToLocal  hdfs source path  localfs destination path Point your web browser to HDFS WEBUI namenode machine 50070   browse to the file you intend to copy  scroll down the page and click on download the file

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1 - Remember the name you gave to the file and instead of using hdfs dfs -put  Use  get  instead  See below   hdfs dfs -get  output-fileFolderName-In-hdfs

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In Hadoop 2 0   hdfs dfs -copyToLocal  lt hdfs input file path gt   lt output path gt    where    hdfs input file path maybe obtained from http    lt  lt name node ip gt  gt  50070 explorer html output path is the local path of the file  where the file is to be copied to  you may also use get in place of copyToLocal

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if you are using docker you have to do the following steps    copy the file from hdfs to namenode  hadoop fs -get output part-r-00000  out text      out text  will be stored on the namenode  copy the file from namenode to local disk by  docker cp namenode  out text output txt  output txt will be there on your current working directory

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you can accomplish in both these ways   1 hadoop fs -get  lt HDFS file path gt   lt Local system directory path gt  2 hadoop fs -copyToLocal  lt HDFS file path gt   lt Local system directory path gt    Ex   My files are located in  sourcedata mydata txt I want to copy file to Local file system in this path  user ravi mydata  hadoop fs -get  sourcedata mydata txt  user ravi mydata

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bin hadoop fs -put  localfs destination path  hdfs source path

[hadoop] How to copy file from HDFS to the local file system

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