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MDEV-26803 PA unsafety with FK cascade delete operation

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This commit has a mtr test where two two transactions delete a row from
two separate tables, which will cascade a FK delete for the same row in
a third table. Second replica node is configured with 2 applier threads,
and the test will fail if these two transactions are applied in parallel.

The actual fix, in this commit, is to mark a transaction as unsafe for
parallel applying when it traverses into cascade delete operation.

Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>
This commit is contained in:
sjaakola 2021-12-09 18:12:20 +02:00 • committed by Jan Lindström
commit c1846c4fcf
9 changed files with 354 additions and 31 deletions
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4
include/mysql/service_wsrep.h
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@ -88,6 +88,7 @@ extern struct wsrep_service_st {
unsigned long long trx_id);
void (*wsrep_thd_kill_LOCK_func)(const MYSQL_THD thd);
void (*wsrep_thd_kill_UNLOCK_func)(const MYSQL_THD thd);
void (*wsrep_thd_set_wsrep_PA_unsafe_func)(MYSQL_THD thd);
} *wsrep_service;
#define MYSQL_SERVICE_WSREP_INCLUDED
@ -131,6 +132,7 @@ extern struct wsrep_service_st {
#define wsrep_thd_is_applying(T) wsrep_service->wsrep_thd_is_applying_func(T)
#define wsrep_thd_set_wsrep_aborter(T) wsrep_service->wsrep_thd_set_wsrep_aborter_func(T1, T2)
#define wsrep_report_bf_lock_wait(T,I) wsrep_service->wsrep_report_bf_lock_wait(T,I)
#define wsrep_thd_set_PA_unsafe(T) wsrep_service->wsrep_thd_set_PA_unsafe_func(T)
#else
#define MYSQL_SERVICE_WSREP_STATIC_INCLUDED
@ -229,5 +231,7 @@ extern "C" my_bool wsrep_thd_is_applying(const MYSQL_THD thd);
extern "C" bool wsrep_thd_set_wsrep_aborter(MYSQL_THD bf_thd, MYSQL_THD victim_thd);
extern "C" void wsrep_report_bf_lock_wait(const THD *thd,
unsigned long long trx_id);
/* declare parallel applying unsafety for the THD */
extern "C" void wsrep_thd_set_PA_unsafe(MYSQL_THD thd);
#endif
#endif /* MYSQL_SERVICE_WSREP_INCLUDED */