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Fix sporadic test failure in main.processlist

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The test runs a query in one thread, then in another queries the processlist
and expects to find the first thread in the COM_SLEEP state. The problem is
that the thread signals completion to the client before changing to COM_SLEEP
state, so there is a window where the other thread can see the wrong state.

A previous attempt to fix this was ineffective. It set a DEBUG_SYNC to handle
proper waiting, but unfortunately that DEBUG_SYNC point ended up triggering
already at the end of SET DEBUG_SYNC=xxx, so the wait was ineffective.

Fix it properly now (hopefully) by ensuring that we wait for the DEBUG_SYNC
point to trigger at the end of the SELECT SLEEP(), not just at the end of
SET DEBUG_SYNC=xxx.
This commit is contained in:
Kristian Nielsen
2014-10-31 12:48:17 +01:00
parent 52fb08ac31
commit bad5fdec18
2 changed files with 12 additions and 2 deletions
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4
mysql-test/r/processlist.result
View File

@ -7,7 +7,9 @@ SELECT ID, TIME,TIME_MS FROM INFORMATION_SCHEMA.PROCESSLIST WHERE CONCAT(":", ID
SET DEBUG_SYNC = 'now SIGNAL fill_schema_proceed';
ID TIME TIME_MS
TID 0 0.000
SET DEBUG_SYNC = 'dispatch_command_end SIGNAL query_done';
SET DEBUG_SYNC = 'dispatch_command_end SIGNAL query_done EXECUTE 2';
SET DEBUG_SYNC= 'now WAIT_FOR query_done';
SET DEBUG_SYNC= 'now SIGNAL nosignal';
select sleep(5);
sleep(5)
0

10
mysql-test/t/processlist.test
View File

@ -28,7 +28,15 @@ connection default;
#
connection con1;
SET DEBUG_SYNC = 'dispatch_command_end SIGNAL query_done';
# Trigger a signal once the thread has gone from "Query" to "Sleep" command
# state. Note we need to execute this twice: Once at the end of SET DEBUG_SYNC,
# and once for the intended time, at the end of SELECT SLEEP().
SET DEBUG_SYNC = 'dispatch_command_end SIGNAL query_done EXECUTE 2';
connection default;
# Wait for and clear the first signal set during SET DEBUG_SYNC.
SET DEBUG_SYNC= 'now WAIT_FOR query_done';
SET DEBUG_SYNC= 'now SIGNAL nosignal';
connection con1;
select sleep(5); #run a query that will take some time
connection default;