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[Mahara Bot <1492919@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://reviews.mahara.org/5360
Committed: https://git.nzoss.org.nz/mahara/mahara/commit/2572307a392991cd8b19ddf2c590653ce99c7a02
Submitter: Robert Lyon (robertl@xxxxxxxxxxxxxxx)
Branch:    15.04_STABLE

commit 2572307a392991cd8b19ddf2c590653ce99c7a02
Author: Russell Boyatt <russell.boyatt@xxxxxxxxxxxxx>
Date:   Sun Sep 20 15:25:19 2015 +0100

Set transaction mode to "READ COMMITTED" to avoid deadlocks. Bug 1492919

behatnotneeded: Testing requires multiple simultaneous users

Change-Id: Icfac83b0ac9ed6ab0c304658550dd0260bd5d7eb
(cherry picked from commit 0eea42ce3b129e0df80814f14b48f8a6da47479e)

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https://bugs.launchpad.net/bugs/1492919

Title:
  Deadlock issues when 20-30 users copying collections & pages at the
  same time

Status in Mahara:
  Fix Committed
Status in Mahara 1.10 series:
  Fix Committed
Status in Mahara 1.9 series:
  In Progress
Status in Mahara 15.04 series:
  Fix Committed
Status in Mahara 15.10 series:
  Fix Committed

Bug description:
  Multiple users on the forum have reported deadlock issues when there
  are many users (20-30) copying pages & collections at the same time.
  See
  https://mahara.org/interaction/forum/topic.php?id=7309&offset=0&limit=10

  Note that 20 to 30 users is around the number you'd hit if you're
  running a whole class of users through a training session at the same
  time.

  The three reported cases of this are all in 15.04, so it may be a
  problem introduced in that version.

  The problem has been reported in both Postgres & MySQL.

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