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Bug#29915479 RUNNING COM_REGISTER_SLAVE WITHOUT COM_BINLOG_DUMP CAN RESULTS IN SERVER EXIT

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in fact, in MariaDB it cannot, but it can show spurious slaves
in SHOW SLAVE HOSTS.

slave was registered in COM_REGISTER_SLAVE and un-registered after
COM_BINLOG_DUMP. If there was no COM_BINLOG_DUMP, it would never
unregister.
This commit is contained in:
Sergei Golubchik 2020-04-28 14:59:47 +02:00
parent 8c534bdeb8
commit 6bb28e0bc5
5 changed files with 52 additions and 1 deletions

16
mysql-test/suite/rpl/r/rpl_fail_register.result Normal file
View file

@ -0,0 +1,16 @@
include/master-slave.inc
[connection master]
set @old_dbug=@@global.debug_dbug;
set global debug_dbug='d,fail_com_register_slave';
stop slave;
reset slave;
include/wait_for_slave_to_stop.inc
start slave;
stop slave;
include/wait_for_slave_to_stop.inc
set global debug_dbug=@old_dbug;
kill DUMP_THREAD;
show slave hosts;
Server_id Host Port Master_id
start slave;
include/rpl_end.inc

33
mysql-test/suite/rpl/t/rpl_fail_register.test Normal file
View file

@ -0,0 +1,33 @@
source include/have_debug.inc;
source include/have_binlog_format_mixed.inc;
source include/master-slave.inc;
connection slave;
set @old_dbug=@@global.debug_dbug;
set global debug_dbug='d,fail_com_register_slave';
stop slave;
reset slave;
source include/wait_for_slave_to_stop.inc;
start slave;
stop slave;
source include/wait_for_slave_to_stop.inc;
set global debug_dbug=@old_dbug;
connection master;
### why is that needed?
let $id=`SELECT id from information_schema.processlist where command='Binlog Dump'`;
if ($id) {
replace_result $id DUMP_THREAD;
eval kill $id;
let $wait_condition= SELECT count(*)=0 from information_schema.processlist where command='Binlog Dump';
source include/wait_condition.inc;
}
show slave hosts;
connection slave;
start slave;
source include/rpl_end.inc;

1
sql/slave.cc
View file

@ -3179,6 +3179,7 @@ connected:
goto err;
goto connected;
}
DBUG_EXECUTE_IF("fail_com_register_slave", goto err;);
}
DBUG_PRINT("info",("Starting reading binary log from master"));

2
sql/sql_class.cc
View file

@ -63,6 +63,7 @@
#include "sql_parse.h" // is_update_query
#include "sql_callback.h"
#include "sql_connect.h"
#include "repl_failsafe.h"
/*
The following is used to initialise Table_ident with a internal
@ -1496,6 +1497,7 @@ THD::~THD()
if (rli_slave)
rli_slave->cleanup_after_session();
my_free(semisync_info);
unregister_slave(this, true, true);
#endif
free_root(&main_mem_root, MYF(0));

1
sql/sql_parse.cc
View file

@ -1269,7 +1269,6 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
general_log_print(thd, command, "Log: '%s' Pos: %lu", name, pos);
if (nlen < FN_REFLEN)
mysql_binlog_send(thd, thd->strmake(name, nlen), (my_off_t)pos, flags);
unregister_slave(thd,1,1);
/* fake COM_QUIT -- if we get here, the thread needs to terminate */
error = TRUE;
break;