Reviewed: https://reviews.mahara.org/5774 Committed: https://git.mahara.org/mahara/mahara/commit/393fd87f5561a59b466468b303b0ee5587a9cef9 Submitter: Aaron Wells (aar...@catalyst.net.nz) Branch: 15.10_STABLE
commit 393fd87f5561a59b466468b303b0ee5587a9cef9 Author: Aaron Wells <aar...@catalyst.net.nz> Date: Tue Nov 17 11:20:54 2015 +1300 Disable transactions in MySQL (Bug 1514608) Mahara's usage of transactions has been causing major deadlock issues in MySQL with InnoDB. The immediate fix is to disable them. behatnotneeded: Covered by existing tests Change-Id: I2c7e6424e2d58502acd26fdd5d05c797e4ee5eac (cherry picked from commit e52be8a3135c19b2ed306a5e16fdc0101d756f6d) -- You received this bug notification because you are a member of Mahara Contributors, which is subscribed to Mahara. Matching subscriptions: Subscription for all Mahara Contributors -- please ask on #mahara-dev or mahara.org forum before editing or unsubscribing it! https://bugs.launchpad.net/bugs/1514608 Title: MySQL deadlock issues with simultaneous users Status in Mahara: Fix Committed Status in Mahara 1.10 series: Fix Committed Status in Mahara 15.04 series: In Progress Status in Mahara 15.10 series: Fix Committed Status in Mahara 16.04 series: Fix Committed 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). See also: * https://mahara.org/interaction/forum/topic.php?id=7309 * https://mahara.org/interaction/forum/topic.php?id=7432 To manage notifications about this bug go to: https://bugs.launchpad.net/mahara/+bug/1514608/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~mahara-contributors Post to : mahara-contributors@lists.launchpad.net Unsubscribe : https://launchpad.net/~mahara-contributors More help : https://help.launchpad.net/ListHelp