Permanently removed test case perfschema.aggregate.
The Performance Schema is generally lock-free, allowing for
race conditions that might arise from multi-threaded operation
which occasionally results in temporary and/or minor variances
when aggregating statistics. This test needs to be redesigned
to accommodate such variances.
Problem is that FLUSH TABLES WITH READ LOCK first blocks threads from
starting new commits, then waits for running commits to complete. But
in-order parallel replication needs commits to happen in a particular
order, so this can easily deadlock.
To fix this problem, this patch introduces a way to temporarily pause
the parallel replication worker threads. Before starting FTWRL, we let
all worker threads complete in-progress transactions, and then
wait. Then we proceed to take the global read lock. Once the lock is
obtained, we unpause the worker threads. Now commits are blocked from
starting by the global read lock, so the deadlock will no longer occur.
A few tests assumes that the CYCLE timer is always available,
which is not true on some platforms (e.g. ARM).
Fixing the tests not to reply on the CYCLE availability.
including the big commit
commit 305130361bf72726de220f3d2b2787395e10be61
Author: Marc Alff <marc.alff@oracle.com>
Date: Tue Feb 10 11:31:32 2015 +0100
WL#8354 BACKPORT DIGEST IMPROVEMENTS TO MYSQL 5.6
(with the following commits) and related changes in sql/
During slow execution, e.g. under valgrind, there was a chance
that Aria checkpoint would happen while P_S tables were being
queried; it could cause different data in joined P_S, and
thus combinations of results that the test did not expect.
Fixed by disabling Aria checkpoints for the test.
