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BUG#23171 (Illegal slave restart position):

Browse source 
Third patch of the bug fix where the code for skipping events and for
executing events is factored out into three functions:
- shall_skip() to decide if the event shall be skipped and the
  reason for it;
- do_apply_event(), where the event is applied to the database; and
- do_update_pos(), which updates the actual relay log position and
  group positions.


mysql-test/r/rpl_row_tabledefs_2myisam.result:
  Result change.
mysql-test/r/rpl_row_tabledefs_3innodb.result:
  Result change.
sql/log_event.cc:
  Creating shall_skip(), do_update_pos(), and do_apply_event()
  functions for each event by factoring out the previous code.
  Adding debug code and fixing some error codes that were not correct.
sql/rpl_rli.cc:
  Renaming unsafe_to_stop_at into last_event_start_time.
  Adding debug code.
sql/rpl_rli.h:
  Renaming unsafe_to_stop_at into last_event_start_time.
sql/slave.cc:
  Renaming unsafe_to_stop_at into last_event_start_time.
This commit is contained in:
unknown 2007-01-17 15:06:37 +01:00
commit 4b00b3f0ce
6 changed files with 226 additions and 96 deletions
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75
sql/slave.cc
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@ -517,11 +517,11 @@ static bool sql_slave_killed(THD* thd, RELAY_LOG_INFO* rli)
really one minute of idleness, we don't timeout if the slave SQL thread
is actively working.
*/
if (!rli->unsafe_to_stop_at)
if (rli->last_event_start_time == 0)
DBUG_RETURN(1);
DBUG_PRINT("info", ("Slave SQL thread is in an unsafe situation, giving "
"it some grace period"));
if (difftime(time(0), rli->unsafe_to_stop_at) > 60)
if (difftime(time(0), rli->last_event_start_time) > 60)
{
slave_print_msg(ERROR_LEVEL, rli, 0,
"SQL thread had to stop in an unsafe situation, in "
@ -1737,61 +1737,14 @@ static int exec_relay_log_event(THD* thd, RELAY_LOG_INFO* rli)
now the relay log starts with its Format_desc, has a Rotate etc).
*/
DBUG_PRINT("info",("type_code=%d, server_id=%d",type_code,ev->server_id));
DBUG_PRINT("info",("type_code=%d (%s), server_id=%d",
type_code, ev->get_type_str(), ev->server_id));
if ((ev->server_id == (uint32) ::server_id &&
!replicate_same_server_id &&
type_code != FORMAT_DESCRIPTION_EVENT) ||
(rli->slave_skip_counter &&
type_code != ROTATE_EVENT && type_code != STOP_EVENT &&
type_code != START_EVENT_V3 && type_code!= FORMAT_DESCRIPTION_EVENT))
{
DBUG_PRINT("info", ("event skipped"));
/*
We only skip the event here and do not increase the group log
position. In the event that we have to restart, this means
that we might have to skip the event again, but that is a
minor issue.
If we were to increase the group log position when skipping an
event, it might be that we are restarting at the wrong
position and have events before that we should have executed,
so not increasing the group log position is a sure bet in this
case.
In this way, we just step the group log position when we
*know* that we are at the end of a group.
*/
rli->inc_event_relay_log_pos();
/*
Protect against common user error of setting the counter to 1
instead of 2 while recovering from an insert which used auto_increment,
rand or user var.
*/
if (rli->slave_skip_counter &&
!((type_code == INTVAR_EVENT ||
type_code == RAND_EVENT ||
type_code == USER_VAR_EVENT) &&
rli->slave_skip_counter == 1) &&
/*
The events from ourselves which have something to do with the relay
log itself must be skipped, true, but they mustn't decrement
rli->slave_skip_counter, because the user is supposed to not see
these events (they are not in the master's binlog) and if we
decremented, START SLAVE would for example decrement when it sees
the Rotate, so the event which the user probably wanted to skip
would not be skipped.
*/
!(ev->server_id == (uint32) ::server_id &&
(type_code == ROTATE_EVENT || type_code == STOP_EVENT ||
type_code == START_EVENT_V3 || type_code == FORMAT_DESCRIPTION_EVENT)))
--rli->slave_skip_counter;
pthread_mutex_unlock(&rli->data_lock);
delete ev;
DBUG_RETURN(0); // avoid infinite update loops
}
pthread_mutex_unlock(&rli->data_lock);
/*
Execute the event, but first we set some data that is needed for
the thread.
*/
thd->server_id = ev->server_id; // use the original server id for logging
thd->set_time(); // time the query
@ -1799,7 +1752,8 @@ static int exec_relay_log_event(THD* thd, RELAY_LOG_INFO* rli)
if (!ev->when)
ev->when = time(NULL);
ev->thd = thd; // because up to this point, ev->thd == 0
exec_res = ev->exec_event(rli);
exec_res= ev->exec_event(rli);
DBUG_PRINT("info", ("exec_event result = %d", exec_res));
DBUG_ASSERT(rli->sql_thd==thd);
/*
@ -2354,13 +2308,17 @@ Slave SQL thread aborted. Can't execute init_slave query");
THD_CHECK_SENTRY(thd);
if (exec_relay_log_event(thd,rli))
{
DBUG_PRINT("info", ("exec_relay_log_event() failed"));
// do not scare the user if SQL thread was simply killed or stopped
if (!sql_slave_killed(thd,rli))
{
/*
retrieve as much info as possible from the thd and, error codes and warnings
and print this to the error log as to allow the user to locate the error
retrieve as much info as possible from the thd and, error
codes and warnings and print this to the error log as to
allow the user to locate the error
*/
DBUG_PRINT("info", ("thd->net.last_errno=%d; rli->last_slave_errno=%d",
thd->net.last_errno, rli->last_slave_errno));
if (thd->net.last_errno != 0)
{
if (rli->last_slave_errno == 0)
@ -2682,6 +2640,7 @@ static int queue_binlog_ver_1_event(MASTER_INFO *mi, const char *buf,
my_free((char*) tmp_buf, MYF(MY_ALLOW_ZERO_PTR));
DBUG_RETURN(1);
}
pthread_mutex_lock(&mi->data_lock);
ev->log_pos= mi->master_log_pos; /* 3.23 events don't contain log_pos */
switch (ev->get_type_code()) {