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########################################################################### # BUG#20928790 SHOW BINLOG EVENTS COMPLETELY LOCKS DOWN WRITES TO BINLOG, # # HENCE TRANSACTIONS. # # # # Problem: While a `SHOW BINLOG EVENTS` is executing, any parallel # # transaction is blocked. # # # # Steps to reproduce: # # =================== # # 1) Execute 'show binlog events' on one connection and let it wait # # inside a loop that reads the events from the file using DEBUG_SYNC # # point # # 2) While the command is waiting, execute some transactions and see # # that they are not blocked. # # # ########################################################################### --source include/have_debug_sync.inc --source include/have_binlog_format_statement.inc # To make test to start with master-bin.000001 RESET MASTER; # Run some sample tests to put it in master-bin.000001 CREATE TABLE t1(i INT); DROP TABLE t1; connect (con1,localhost,root,,); # Let show binlog events wait while it is reading events SET DEBUG_SYNC = "wait_in_show_binlog_events_loop SIGNAL reached_for_loop WAIT_FOR go_ahead"; --send SHOW BINLOG EVENTS --connection default # Make sure show binlog events execution reaches the point where we wanted to SET DEBUG_SYNC = "now WAIT_FOR reached_for_loop"; # Now execute some transactions and it should not be blocked CREATE TABLE t1(i INT); INSERT INTO t1 VALUES (12); DROP TABLE t1; # Once above sample transactions are running fine, send signal to continue # 'show binlog events' command SET DEBUG_SYNC = "now SIGNAL go_ahead"; # Make sure show binlog events run successfully # 'show binlog events' output varies for different runs # (gtid, non-gtid, 5.6, 5.7). So lets disable the output --disable_result_log --connection con1 --reap --enable_result_log