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A trick (a useless update) to force the slave to wait for TWO rotate events

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before stopping. This is to make the test's result predictable (depending
on the machine the results could formerly be slightly different, though
everything is sane in the code; it's not a bug).


mysql-test/r/rpl_log.result:
  result update
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2003-05-27 23:07:32 +02:00
parent da8f7ecadd
commit 546b2221a2
2 changed files with 36 additions and 8 deletions
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22
mysql-test/t/rpl_log.test
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@ -22,10 +22,32 @@ show binlog events from 79 limit 2;
show binlog events from 79 limit 2,1;
flush logs;
# We need an extra update before doing save_master_pos.
# Otherwise, an unlikely scenario may occur:
# * When the master's binlog_dump thread reads the end of master-bin.001,
# it send the rotate event which is at this end, plus a fake rotate event
# because it's starting to read a new binlog.
# save_master_pos will record the position of the first of the two rotate
# (because the fake one is not in the master's binlog anyway).
# * Later the slave waits for the position of the first rotate event,
# and it may quickly stop (in 'slave stop') without having received the fake
# one.
# So, depending on a few milliseconds, we end up with 2 rotate events in the
# relay log or one, which influences the output of SHOW SLAVE STATUS, making
# it not predictable and causing random test failures.
# To make it predictable, we do a useless update now, but which has the interest
# of making the slave catch both rotate events.
create table t5 (a int);
drop table t5;
# Sync slave and force it to start on another binary log
save_master_pos;
connection slave;
# Note that the above 'slave start' will cause a 3rd rotate event (a fake one)
# to go into the relay log (the master always sends a fake one when replication
# starts).
slave start;
sync_with_master;
flush logs;