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[Kristina Hoeppner <1417816@xxxxxxxxxxxxxxxxxx>]

** Changed in: mahara
    Milestone: 17.04.0 => None

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https://bugs.launchpad.net/bugs/1417816

Title:
  Export queue to deal with big vs small exports differently

Status in Mahara:
  Confirmed

Bug description:
  We should only export big archiving when server is not busy but we
  should be able to do small exports at any time.

  So we need to work out before an export begins approximately how big
  it is going to be and record that in the export_queue table.

  Currently in htdocs/export/lib.php (line 625) there is the following:

  
         // Get an estimate of how big the unzipped export file would be
          // so we can check that we have enough disk space for it
          $space = $exporter->is_diskspace_available();

  So we can take the value of $space and make a decision on it and bail
  out if $space is big and server is busy. Something like:

  if ($space > TOO_BIG && server_busy()) {
              log_info('too busy');
              return true;
  }

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