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MDEV-31813 SET GLOBAL innodb_max_purge_lag_wait hangs if innodb_read_only

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innodb_max_purge_lag_wait_update(): Return immediately if we are
in high_level_read_only mode.

srv_wake_purge_thread_if_not_active(): Relax a debug assertion.
If srv_read_only_mode holds, purge_sys.enabled() will not hold
and this function will do nothing.

trx_t::commit_in_memory(): Remove a redundant condition before
invoking srv_wake_purge_thread_if_not_active().
This commit is contained in:
Marko Mäkelä 2023-08-24 10:08:51 +03:00
parent e9f3ca6125
commit 02878f128e
5 changed files with 6 additions and 4 deletions
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1
mysql-test/suite/innodb/r/read_only_recovery.result
View File

@ -35,6 +35,7 @@ SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
a
3
SET GLOBAL innodb_max_purge_lag_wait=0;
# restart
SELECT * FROM t;
a

1
mysql-test/suite/innodb/t/read_only_recovery.test
View File

@ -37,6 +37,7 @@ UPDATE t SET a=3 WHERE a=1;
SELECT * FROM t;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t;
SET GLOBAL innodb_max_purge_lag_wait=0;
--let $restart_parameters=
--source include/restart_mysqld.inc
SELECT * FROM t;

2
storage/innobase/handler/ha_innodb.cc
View File

@ -238,6 +238,8 @@ static uint innodb_max_purge_lag_wait;
static void innodb_max_purge_lag_wait_update(THD *thd, st_mysql_sys_var *,
void *, const void *limit)
{
if (high_level_read_only)
return;
const uint l= *static_cast<const uint*>(limit);
if (trx_sys.rseg_history_len <= l)
return;

3
storage/innobase/srv/srv0srv.cc
View File

@ -1902,8 +1902,7 @@ srv_active_wake_master_thread_low()
void
srv_wake_purge_thread_if_not_active()
{
ut_ad(!srv_read_only_mode);
ut_ad(!mutex_own(&srv_sys.mutex));
ut_ad(srv_read_only_mode || !mutex_own(&srv_sys.mutex));
if (purge_sys.enabled() && !purge_sys.paused()
&& !srv_sys.n_threads_active[SRV_PURGE]

3
storage/innobase/trx/trx0trx.cc
View File

@ -1477,8 +1477,7 @@ inline void trx_t::commit_in_memory(const mtr_t *mtr)
trx_mutex_exit(this);
ut_a(error_state == DB_SUCCESS);
if (!srv_read_only_mode)
srv_wake_purge_thread_if_not_active();
srv_wake_purge_thread_if_not_active();
}
/** Commit the transaction in a mini-transaction.