java-hdfs-client's Introduction

java-hdfs-client

Java hadoop client that provides convenients api for file management and interaction with hadoop file system

Install

Add the following dependency to your pom file:

<dependency>
    <groupId>com.github.chen0040</groupId>
    <artifactId>java-hdfs-client</artifactId>
    <version>1.0.1</version>
</dependency>

Usage

To copy local file to hdfs:

String hdfsUri = "hdfs://10.0.1.23:9000/";
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("/tmp/test.txt")));
writer.write("Hello World");
writer.close();

HadoopProperties properties = new HadoopProperties();
properties.setUri(hdfsUri);
properties.setUsername("hadoop");

HadoopFileUtils.copyFromLocalToHdfs(properties, "/tmp/test.txt", "/tmp/test.txt");

To copy a file from hdfs to local disk:

HadoopProperties properties = new HadoopProperties();
properties.setUri(hdfsUri);
properties.setUsername("hadoop");

HadoopFileUtils.copyFromHdfsToLocal(properties, "/tmp/test.txt", "/tmp/test.txt");

To check if a file exists in hdfs

HadoopProperties properties = new HadoopProperties();
properties.setUri(hdfsUri);
properties.setUsername("hadoop");

boolean exists = HadoopFileUtils.pathExistsOnHdfs(properties, "/tmp/test.txt");

To delete a file in hdfs:

String hdfsUri = "hdfs://10.0.1.23:9000/";
HadoopProperties properties = new HadoopProperties();
properties.setUri(hdfsUri);
properties.setUsername("hadoop");

HadoopFileUtils.deleteHdfsFile(properties, "/tmp/test.txt");

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