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MDEV-20867 - Perform careful review of "Server crashes with BACKUP STAGE and FLUSH TABLE table_name"

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Reverted original patch (c2e0a0b).

For consistency with "LOCK TABLE <table_name> READ" and "FLUSH TABLES
WITH READ LOCK", which are forbidden under "BACKUP STAGE", forbid "FLUSH
TABLE <table_name> FOR EXPORT" and "FLUSH TABLE <table_name> WITH READ
LOCK" as well.

It'd allow consistent fixes for problems like MDEV-18643.
This commit is contained in:
Sergey Vojtovich
2019-11-01 19:18:47 +04:00
parent 646d1ec83a
commit c5e00fea10
5 changed files with 16 additions and 53 deletions
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sql/sql_class.cc
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@ -5580,6 +5580,7 @@ void THD::leave_locked_tables_mode()
{
if (locked_tables_mode == LTM_LOCK_TABLES)
{
DBUG_ASSERT(current_backup_stage == BACKUP_FINISHED);
/*
When leaving LOCK TABLES mode we have to change the duration of most
of the metadata locks being held, except for HANDLER and GRL locks,