JRuby HDFS¶ ↑

This is an interface to the Hadoop Distributed Filesystem. See hadoop.apache.org/hdfs/ for more information on Hadoop and HDFS in particular.

It uses the Java API thus, only JRuby is supported.

Getting Started¶ ↑

Usage ¶ ↑

open HDFS file for read (stream will not be closed)

file = File.new(path,"r") # will open a read-only stream in HDFS
puts file.read
file.close

or use with a block (stream will be closed automatically)

File.new("/my/file") do |file|
    puts file.read
end

Run the tests¶ ↑

Install and start Hadoop (at least hdfs) and set HADOOP_HOME environment variable, then run

rake

Please note that the tests will modify your HDFS (add/remove files and paths). You might want to run a separate HDFS just for the tests!

Contributing to jruby_hdfs¶ ↑

• Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet

• Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it

• Fork the project

• Start a feature/bugfix branch

• Commit and push until you are happy with your contribution

• Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.

• Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

References¶ ↑

• Hadoop: hadoop.apache.org/hdfs/

Copyright¶ ↑

Copyright © 2011 Frank Falkenberg. See LICENSE.txt for further details.