Become a Big Data Expert with HDFS Read-Write Operations
It becomes necessary to spread out data across a number of different physical computers when it exceeds the storage capacity of a single physical system. Distributed file systems are a type of file system that control storage-specific actions over a network of computers. One such programme is HDFS.
Hadoop Distributed File System (HDFS) is a main/primary storage system used by Apache Hadoop, a popular open-source big data processing framework. HDFS, distributed file system that is designed to store and process large volumes of data in a distributed manner.
When the amount of data surpasses the storage capacity of a single physical system, it becomes necessary to distribute the data over a number of separate physical computers. A type of file system known as a distributed file system manages storage-specific operations over a network of computers. HDFS is one such programme.
In HDFS, you can perform read and write operations on files and directories. Here are some examples of common HDFS read and write operations:
- Read file: You can use the hdfs dfs -cat command to read the contents of a file in HDFS. For example, to read the file /user/hadoop/input.txt, you can use the following command:
hdfs dfs -cat /user/hadoop/input.txt
2. Write file: You can use the hdfs dfs -put command to write a local file to HDFS. For example, to write the local file input.txt to the HDFS directory /user/hadoop, you can use the following command:
hdfs dfs -put input.txt /user/hadoop/
3. Create directory: You can use the hdfs dfs -mkdir command to create a new directory in HDFS. For example, to create the directory /user/hadoop/data, you can use the following command:
hdfs dfs -mkdir /user/hadoop/data
4.List directory contents: You can use the hdfs dfs -ls command to list the contents of a directory in HDFS. For example,in order to list the contents of the directory /user/hadoop, you can use the following command:
hdfs dfs -ls /user/hadoopOverall, HDFS provides a range of read and write operations that allow you to access and manipulate data stored in the file system.