Grid5000 Metadata Bundler

	Note
	This page is actively maintained by the Grid'5000 team. If you encounter problems, please report them (see the Support page). Additionally, as it is a wiki page, you are free to make minor corrections yourself if needed. If you would like to suggest a more fundamental change, please contact the Grid'5000 team.

This page summarize what you need to know about g5k-metadata-bundler.

Introduction

When running experiments on Grid'5000, users generate metadata across multiple services. This metadata is useful for reproducibility purposes or scientific dissemination. The g5k-metadata-bundler is a tool designed to retrieve metadata across all the different services and bundle them in a single archive. The bundle only retrieves metadata generated by Grid'5000 services, the collection of data generated by the users experiment is beyond the scope of this application.

	Warning
	This service is in alpha version and not yet feature complete. See the section on Planned_Evolutions.

Usage

G5k-metadata-bundler is installed on every site frontend in Grid'5000. It can only be executed from the site frontends.

g5k-metadata-bundler -s SITE -j JOBID [-o OUTPUT]
  -v, --version                    Print g5k-metadata-bundler version
  -s, --job-site SITE              [MANDATORY] Grid'5000 site from which to extract
  -j, --job-id JID                 [MANDATORY] Job id of the OAR jod to extract
  -o, --output NAME                Bundle name to use for the directory/archive

Users do not need to operate the bundler on the same frontend as the site the jobs was executed on. The bundler download all data pertaining to the queried job and bundle in a archive named g5k-bundle-SITE-JID.tar.gz or if an output name has been provided NAME.tar.gz. The bundle is provided in as a tar.gz archive which can be manipulated by using the following commands:

• Listing

  tar -tzf NAME.tar.gz lists all files contained within the bundle

  Extraction

  tar -xzf NAME.tar.gz extracts all files to a directory with the same name as the bundle

Users operating on older versions of Windows might require thrid party software to unpack the bundle. (often 7-zip)

Example usage

user@fsophia:~$ g5k-metadata-bundler -s nancy -j 3003030
 Running g5k-metadata-bundler for job 3003030 at nancy
 Downloading https://api.grid5000.fr/stable/sites/nancy/jobs/3003030
 Downloading https://api.grid5000.fr/stable/sites/nancy/clusters/graoully/nodes/graoully-1?version=7f6b81c2621c6ed3a4fac632f213436813495755
 Downloading https://api.grid5000.fr/stable/?version=7f6b81c2621c6ed3a4fac632f213436813495755&deep=true
 Downloading https://api.grid5000.fr/stable/sites/nancy/metrics?job_id=3003030&nodes=graoully-1
 Generating README
 Compressing bundle
 Bundle created at g5k-bundle-nancy-3003030.tar.gz
user@fsophia:~$ ls -lh g5k-bundle-nancy-3003030.tar.gz
 -rw-r--r-- 1 user g5k-users 456K Jul 19 09:50 g5k-bundle-nancy-3003030.tar.gz
user@fsophia:~$ tar -tzf g5k-bundle-nancy-3003030.tar.gz
 g5k-bundle-nancy-3003030/
 g5k-bundle-nancy-3003030/g5k-oarjob-nancy-3003030.json
 g5k-bundle-nancy-3003030/README
 g5k-bundle-nancy-3003030/g5k-resource-nancy-graoully-1-7f6b81c2621c6ed3a4fac632f213436813495755.json
 g5k-bundle-nancy-3003030/g5k-monitoring-nancy-graoully-1-3003030.json
 g5k-bundle-nancy-3003030/g5k-refapi-7f6b81c2621c6ed3a4fac632f213436813495755.json

Bundle contents

The bundle contains these different files types:

• g5k-oarjob-SITE-JID.json: Job files

  Contains the information for a given OAR job JID at Grid'5000 site SITE such as:

  • submission, start, and end dates
  • user and group (group granting access) of the job
  • job types and properties
  • command executed by the job
  • list of resources attributed to the job
  • OAR events for the job

  This information is extracted from the jobs API

• g5k-resource-SITE-NODE-VERSION.json: Resource files

  Contains information about a single NODE, such as:

  • Node architecture, bios, ram, and cpu information
  • network, storage, and monitoring devices
  • base configuration information

  The bundle will contain one such file for each of the nodes involved in a job.

  This information is extracted from the reference API

  The VERSION of the information contained in this file will match what it was on the day the job was executed.

• g5k-refapi-VERSION.json: Reference API files

  Contains a full copy of the reference API at VERSION

  This can be used to look up information about nodes not directly used by the bundled oar jobs.

  The resources files are a subset of this file.

• g5k-monitoring-SITE-NODE-JID.json: Monitoring files

  Contains all the monitoring measurements made by Kwollect for a NODE during the oar job JID.

  The contents will vary depending on how much monitoring was enabled for a given job. See default metrics in Monitoring_Using_Kwollect.

  Often the heaviest files in the bundle

  This information is extracted from Kwollect

• README: The readme file

  Contains information pertaining to the execution of the bundler such as:

  • Bundler version
  • Execution date
  • List of warnings and errors that happened during bundling
  • List of files included in the bundle with a short description

User will also find at the end of every file a small bundler info segment. This segment contains the date at which the file was generated, warnings raised by the file generation and a list of references indicating how this file relates to other files in the bundle.

Planned Evolutions

As the bundler is still in alpha version, we welcome comments and feature request.

The following is a list of features we are already looking at:

• Concerning bundle contents

  • Bundling multiple jobs in a single archive
  • Bundling based on job names
  • Better management of monitoring information when it is too big for download
  • Adding information concerning the standard environment to the bundle
  • Adding image deployments to the bundle
    • Adding information concerning the deployed images

  Concerning bundler operation

  • No-compress mode where the bundle is left as a directory containing all files
  • Appending new files to an existing bundle
  • Reduce memory footprint
  • Assess viability of parallel downloads

Open questions

Additionally, we would welcome feedback concerning the following open questions:

• What format should be used inside the bundle ? Are json files sufficient or should we convert files to a structured XML ?
• Should we keep bundler segments at the end of every file ? Should we move all cross references to a separate file ? Not have cross references at all ?