Hadoop HDFS Maven
Create a Maven Project:
- If you haven’t already, create a new Maven project or use an existing one as your development project.
Add Hadoop Dependencies:
- You need to add Hadoop dependencies to your project’s
pom.xml
file to access Hadoop HDFS functionality. Add the following dependency for Hadoop Common and HDFS:
xml<dependencies> <!-- Hadoop Common --> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>3.0.0</version> <!-- Use the desired Hadoop version --> </dependency> <!-- Hadoop HDFS --> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>3.0.0</version> <!-- Use the desired Hadoop version --> </dependency> </dependencies>
Make sure to replace
3.0.0
with the version of Hadoop you want to use.- You need to add Hadoop dependencies to your project’s
Create an HDFS Client:
- Write Java code to create an HDFS client and interact with HDFS. You can use the
org.apache.hadoop.fs
package to work with HDFS. Here’s a simple example to get you started:
javaimport org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; public class HDFSExample { public static void main(String[] args) { try { // Create a Hadoop configuration Configuration conf = new Configuration(); conf.set("fs.defaultFS", "hdfs://localhost:9000"); // Replace with your HDFS address // Create an HDFS filesystem object FileSystem fs = FileSystem.get(conf); // Example: Create a new directory Path newDir = new Path("/user/myuser/new_directory"); boolean success = fs.mkdirs(newDir); if (success) { System.out.println("Directory created successfully."); } else { System.err.println("Directory creation failed."); } // Close the HDFS filesystem object when done fs.close(); } catch (Exception e) { e.printStackTrace(); } } }
In this example, we create an HDFS client, set the HDFS address, and create a new directory in HDFS. You can use various methods provided by the
FileSystem
class to perform operations like reading, writing, and deleting files and directories in HDFS.- Write Java code to create an HDFS client and interact with HDFS. You can use the
Build and Run:
- Build your Maven project using the
mvn clean install
command or your IDE’s build tools. - Run your Java application to interact with HDFS.
- Build your Maven project using the
Hadoop Training Demo Day 1 Video:
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