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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.
52 lines
1.7 KiB
Text
52 lines
1.7 KiB
Text
#
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# MDEV-4578 information_schema.processlist reports incorrect value for Time (2147483647)
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#
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source include/have_debug_sync.inc;
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let $tid= `SELECT CONNECTION_ID()`;
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SET DEBUG_SYNC = 'dispatch_command_before_set_time WAIT_FOR do_set_time';
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send SELECT 1;
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connect (con1,localhost,root,,);
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SET DEBUG_SYNC = 'fill_schema_processlist_after_unow SIGNAL do_set_time WAIT_FOR fill_schema_proceed';
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--replace_result $tid TID
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send_eval SELECT ID, TIME,TIME_MS FROM INFORMATION_SCHEMA.PROCESSLIST WHERE CONCAT(":", ID, ":") = ":$tid:";
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connection default;
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reap;
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SET DEBUG_SYNC = 'now SIGNAL fill_schema_proceed';
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connection con1;
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--replace_result $tid TID
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reap;
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connection default;
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#
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# MDEV-4683 query start_time not reset when going to sleep
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#
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connection con1;
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# Trigger a signal once the thread has gone from "Query" to "Sleep" command
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# state. Note we need to execute this twice: Once at the end of SET DEBUG_SYNC,
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# and once for the intended time, at the end of SELECT SLEEP().
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SET DEBUG_SYNC = 'dispatch_command_end SIGNAL query_done EXECUTE 2';
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connection default;
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# Wait for and clear the first signal set during SET DEBUG_SYNC.
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SET DEBUG_SYNC= 'now WAIT_FOR query_done';
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SET DEBUG_SYNC= 'now SIGNAL nosignal';
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connection con1;
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select sleep(5); #run a query that will take some time
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connection default;
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# Need to ensure that the previous query has really completed. Otherwise,
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# the select could see the previous query still in "Query" stage in the
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# processlist.
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SET DEBUG_SYNC = 'now WAIT_FOR query_done';
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# verify that the time in COM_SLEEP doesn't include the query run time
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select command, time < 5 from information_schema.processlist where id != connection_id();
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disconnect con1;
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set debug_sync='reset';
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