What is the best way to copy files between HDFS clusters?

You can copy files or directories between different clusters by using the hadoop distcp command. You must include a credentials file in your copy request so the source cluster can validate that you are authenticated to the source cluster and the target cluster.

How do I transfer data from one HDFS location to another?

Usage:

1. copy one file to another. \% hadoop distcp file1 file2.
2. copy directories from one location to another. \% hadoop distcp dir1 dir2.

How do I copy a CSV file from local to HDFS?

2 Answers

1. move csv file to hadoop sanbox (/home/username) using winscp or cyberduck.
2. use -put command to move file from local location to hdfs. hdfs dfs -put /home/username/file.csv /user/data/file.csv.

Is it possible to copy files across multiple clusters if yes how can you accomplish this?

Yes, it is possible to copy files across multiple Hadoop clusters and this can be achieved using distributed copy. DistCP command is used for intra or inter cluster copying.

What tool would work best for putting a file on your local filesystem into HDFS?

Apache Sqoop(TM) is a tool designed for efficiently transferring bulk data between Apache Hadoop and structured datastores such as relational databases. Data from MySQL, SQL Server & Oracle tables can be loaded into HDFS with this tool.

How do you copy the files file from HDFS location to another Hdfs location?

You can use the cp command in Hadoop. This command is similar to the Linux cp command, and it is used for copying files from one directory to another directory within the HDFS file system.

What is difference between CP and DistCp?

2) distcp runs a MR job behind and cp command just invokes the FileSystem copy command for every file. 3) If there are existing jobs running, then distcp might take time depending memory/resources consumed by already running jobs.In this case cp would be better. 4) Also, distcp will work between 2 clusters.