• Just export the following envand run sbt run or you may simple make a jar using sbt assembly to run it on multiple places
• You just need to export the following env vars

  export HDFS_URL=hdfs://localhost:9000 #default
  export HDFS_USER=hadoop
  #DESTINATION_FOLDER must end with a "/"
  export DESTINATION_FOLDER="/some-local-path/"
  #top most path which has the the sequence file
  export HDFS_DIR="/"

• For HDFS_DIR the top level directory is required, it will find all the sequence files under it directories may also contain files other then sequence file but that's okay, given that in case you just need to expand one file you may simple give the absolute path to the sequence file for env var HDFS_DIR

• For a quick test you may pull this image shuhamknoldus/hdfs-container:3.2.1 the user in this image is root so you may run docker run -p9000:9000 -p9870:9870 shuhamknoldus/hdfs-container:3.2.1 then you can simply use this without having to setup HDFS locally
• After saving you can save some sequence file in to the hdfs
• Using

export HDFS_URL=hdfs://localhost:9000 
export HDFS_USER=hadoop

as hdfs parameters

Feel free to report any bugs/enhancement :)