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# When the relay log gets rotated while the I/O thread
# is reading a transaction, the transaction spans on two or more
# relay logs. If STOP SLAVE occurs while the SQL thread is
# executing a part of the transaction in the non-first relay logs,
# we test if START SLAVE will resume in the beginning of the
# transaction (i.e., step back to the first relay log)
# The slave is started with max_binlog_size=16384 bytes,
# to force many rotations (approximately 30 rotations)
# If the master or slave does not support InnoDB, this test will pass
source include/master-slave.inc;
connection slave;
stop slave;
connection master;
create table t1 (a int) type=innodb;
let $1=8000;
disable_query_log;
begin;
while ($1)
{
# eval means expand $ expressions
eval insert into t1 values( $1 );
dec $1;
}
commit;
# This will generate a 500kB master's binlog,
# which corresponds to 30 slave's relay logs.
enable_query_log;
save_master_pos;
connection slave;
reset slave;
start slave;
# We wait 1 sec for the SQL thread to be somewhere in
# the middle of the transaction, hopefully not in
# the first relay log, and hopefully before the COMMIT.
# Usually it stops when the SQL thread is around the 15th relay log.
# We cannot use MASTER_POS_WAIT() as master's position
# increases only when the slave executes the COMMIT.
system sleep 1;
stop slave;
# We suppose the SQL thread stopped before COMMIT.
# If so the transaction was rolled back
# and the table is now empty.
# Now restart
start slave;
# And see if the table contains '8000'
# which proves that the transaction restarted at
# the right place.
# We must wait for the transaction to commit before
# reading, MASTER_POS_WAIT() will do it for sure
# (the only statement with position>=3000 is COMMIT).
# Older versions of MySQL would hang forever in MASTER_POS_WAIT
# because COMMIT was said to be position 0 in the master's log (bug).
# Detect this with timeout.
select master_pos_wait('master-bin.001',3000,120)=-1;
select * from t1 where a=8000;
# Note that the simple fact to have less than around 30 slave's binlogs
# (the slave is started with --log-slave-updates) is already
# a proof that the transaction was not properly resumed.
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