Description: This article provides a beginner-friendly guide on understanding and using HDFS commands. It explains key concepts, provides code examples, and offers hands-on tasks for practical learning.
Explanation for the video
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Key Concepts Explanation
Usage of Gateway Node
To run HDFS commands, it is recommended to use the designated Gateway server set as the Gateway for the HDFS service. Ensure that the Namenode process is running on port 8020 for access to HDFS.
head -20 /etc/hadoop/conf/core-site.xml
Available Commands
hadoop fs
orhdfs dfs
: List all available commands.hadoop fs -usage
: Provides basic usage information for the given command.hadoop fs -help
: Offers additional information for all commands.- Individual command help can be accessed by appending
-help
to the command.
hdfs dfs -help
hdfs dfs -usage ls
hdfs dfs -help ls
Hands-On Tasks
Perform the following tasks to practice using HDFS commands:
- Make sure the designated Gateway server is set correctly.
- List all the available commands using
hadoop fs
. - Retrieve basic usage information using
hadoop fs -usage
. - Explore additional information for all commands with
hadoop fs -help
.
Conclusion
In this article, we covered the fundamentals of HDFS commands, including how to access them through the Gateway node and the various command options available. Practicing these commands will enhance your understanding of HDFS operations and help you navigate data in the Hadoop ecosystem effectively.
Getting help or usage
Let us explore details about how to list the commands and get the help or usage for a given command.