mahara-contributors team mailing list archive

[Aaron Wells <1514608@xxxxxxxxxxxxxxxxxx>]

Most of our reports are for sites on 15.04, and it seems to get worse
when there are more users. It's possible this was some sort of
underlying deadlock potential in Mahara that was made worse by some low-
level code change in 15.04, like something that gets triggered by
init.php or some other frequent bit of code, which was not triggered as
frequently before.

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https://bugs.launchpad.net/bugs/1514608

Title:
  MySQL deadlock issues with simultaneous users

Status in Mahara:
  In Progress

Bug description:
  The patch in Bug 1492919 resolved the deadlock issues for some users,
  but others are still reporting that they are getting deadlocks. This
  seems to be an issue unique to MySQL, and it can happen with as few as
  2 or 3 concurrent users.

  It has been reported across all stable versions. Strangely, it seems
  to be a relatively recent issue (i.e. we never heard this with Mahara
  1.8 or 1.7, etc), so this suggests it was triggered by something that
  changed fairly recently. One possible candidate is our switch to the
  mysqli driver (before that Mahara wasn't doing transactions at all, in
  mysql).

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