mahara-contributors team mailing list archive

[Aaron Wells <1514608@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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).

** Affects: mahara
     Importance: High
     Assignee: Aaron Wells (u-aaronw)
         Status: In Progress

** Description changed:

  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).

** Changed in: mahara
       Status: New => In Progress

** Changed in: mahara
   Importance: Undecided => High

** Changed in: mahara
     Assignee: (unassigned) => Aaron Wells (u-aaronw)

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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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