mahara-contributors team mailing list archive

[Robert Lyon <robertl@xxxxxxxxxxxxxxx>]

This does indeed sound like a rendering issue with too much browser
resource being taken up to handle the pdfs. I suspect the bigger the pdf
the more resources it will take to render.

So having 6 small pdfs may work fine but 3 big pdfs fail as each page of
the pdf takes resources to render.

So it might be easiest to have a warning in the pdf configuration form
warning about the resource intensiveness.

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https://bugs.launchpad.net/bugs/1508300

Title:
  Embedded PDFs aren't always displayed

Status in Mahara:
  Confirmed

Bug description:
  Noticed in Mahara 1.10; testing on 15.04 and 15.10 needed:

  When a page contains many embedded PDFs, the following can happen (all at once):
  - some PDFs are displayed
  - others show an error message
  - others show a Mahara login box
  - you can be logged out completely

  An initial investigation couldn't replicate the issue successfully and
  it seemed to happen intermittently. From what we gathered, it seems to
  be a rendering / loading / overloading issue: Too many instances of
  pdf.js try to be loaded at the same time causing timeouts and other
  weird behavior.

  I see two possibilities:
  1. Limit the number of PDFs that can be embedded on a page
  2. Load PDF blocks progressively one after the other

  I don't know if the second option would mitigate the problem or not.
  The first one could be limiting user's creativity, but would prevent
  endless waiting for a page to load with the content.

  Further insight is needed before a final decision can be made on how
  to continue from here.

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