Input File Transfer via HTTP

Overview

Due to the distributed configuration of the OSG, more often than not, your jobs will need to bring along a copy (i.e. transfer a copy) of data, code, packages, software, etc. to the execute node where the job will run. This requirement applies to any and all files that are needed to successfully execute and complete your job.

This guide will describe steps and important considerations for transferring your files that are >100MB but <1GB using the HTTP file transfer mechanism via the HTCondor submit file.

Important Considerations

As described in the Introduction to Data Management on OSG Connect any data, files, or even software that is >100MB should be staged in your /public directory on your login node. Files in your /public directory that are <1GB can be transferred with your jobs via HTTP using your HTCondor submit file.

If you have files that are >1GB please plan to use StashCache.

Transfer Files From /public Using HTTP

To transfer files staged in your /public directory, use an HTTP URL in combination with the transfer_input_files statement in your HTCondor submit. For example:

transfer_input_files = http://stash.osgconnect.net/public/username/path/my_software.tar.gz

Where username refers to your OSG Connect username. Multiple URLs can be specified using a comma-separated list, and a combination of URLs and files from /home directory can be provided in a comma separated list. For example,

transfer_input_files = http://stash.osgconnect.net/public/username/path/my_software.tar.gz, /home/username/my_data.csv

Transfer Files Directly From The Web Using HTTP

Files that are available on the web, and are <1GB in size, can also be transferred with your jobs via HTTP using transfer_input_files. Examples of files that are available on the web that may be needed for your jobs include precompiled binaries (i.e. software), data in public repositories, etc. Like the example above, use a URL in comnbination with the transfer_input_files statement in your HTCondor submit file. For example, to have a copy of the Blast precompiled binaries transferred with your jobs you can use:

transfer_input_files = https://ftp.ncbi.nlm.nih.gov/blast/executables/blast+/LATEST/ncbi-blast-2.10.0+-x64-linux.tar.gz

 

This page was updated on Oct 22, 2020 at 21:29 from start/data/file-transfer-via-http.md.