fs-hdfs

It's based on the version 0.0.4 of http://hyunsik.github.io/hdfs-rs to provide libhdfs binding library and rust APIs which safely wraps libhdfs binding APIs.

Current Status

• All libhdfs FFI APIs are ported.
• Safe Rust wrapping APIs to cover most of the libhdfs APIs except those related to zero-copy read.
• Compared to hdfs-rs, it removes the lifetime in HdfsFs, which will be more friendly for others to depend on.

Documentation

• [API documentation] (https://yahonanjing.github.io/fs-hdfs)

Requirements

• Hadoop compiled with native library (i.e., maven profile -Pnative)
  • Please refer to https://github.com/apache/hadoop/blob/trunk/BUILDING.txt if you need more description.
• The C related files are from the branch 3.3.1 of hadoop repository. For rust usage, a few changes are also applied.

Usage

Add this to your Cargo.toml:

toml [dependencies] fs-hdfs = "0.1.1"

fs-hdfs uses libhdfs. Firstly, we need to add library path to find the libhdfs. An example for MacOS,

sh export DYLD_LIBRARY_PATH=$HADOOP_HOME/lib/native:$JAVA_HOME/jre/lib/server

Here, $HADOOP_HOME and $JAVA_HOME need to be specified and exported.

Since our dependent libhdfs is JNI native implementation, it requires the proper CLASSPATH. An example,

sh export CLASSPATH=$CLASSPATH:`hadoop classpath`

Testing

The test also requires the CLASSPATH. In case that the java class of org.junit.Assert can't be found. Refine the $CLASSPATH as follows:

sh export CLASSPATH=$CLASSPATH:`hadoop classpath`:$HADOOP_HOME/share/hadoop/tools/lib/*

Then you can run

bash cargo test

Example

```rust use hdfs::hdfs::HdfsFs;

let fs: HdfsFs = HdfsFs::new("hdfs://localhost:8020/").ok().unwrap(); match fs.mkdir("/data") { Ok() => { println!("/data has been created") }, Err() => { panic!("/data creation has failed") } }; ```