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Added syntax and implementation for BACKUP STAGE's

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Part of MDEV-5336 Implement LOCK FOR BACKUP

- Changed check of Global_only_lock to also include BACKUP lock.
- We store latest MDL_BACKUP_DDL lock in thd->mdl_backup_ticket to be able
  to downgrade lock during copy_data_between_tables()
This commit is contained in:
Monty
2018-11-13 01:34:37 +02:00
parent 965311ee8b
commit c53aab974b
38 changed files with 3530 additions and 41 deletions
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27
sql/sql_class.h
View File

@ -38,15 +38,14 @@
#include "thr_timer.h"
#include "thr_malloc.h"
#include "log_slow.h" /* LOG_SLOW_DISABLE_... */
#include "sql_digest_stream.h" // sql_digest_state
#include <mysql/psi/mysql_stage.h>
#include <mysql/psi/mysql_statement.h>
#include <mysql/psi/mysql_idle.h>
#include <mysql/psi/mysql_table.h>
#include <mysql_com_server.h>
#include "session_tracker.h"
#include "backup.h"
extern "C"
void set_thd_stage_info(void *thd,
@ -1958,19 +1957,6 @@ public:
bool lock_global_read_lock(THD *thd);
void unlock_global_read_lock(THD *thd);
/**
Check if this connection can acquire protection against GRL and
emit error if otherwise.
*/
bool can_acquire_protection() const
{
if (m_state)
{
my_error(ER_CANT_UPDATE_WITH_READLOCK, MYF(0));
return TRUE;
}
return FALSE;
}
bool make_global_read_lock_block_commit(THD *thd);
bool is_acquired() const { return m_state != GRL_NONE; }
void set_explicit_lock_duration(THD *thd);
@ -2193,6 +2179,7 @@ public:
rpl_io_thread_info *rpl_io_info;
rpl_sql_thread_info *rpl_sql_info;
} system_thread_info;
MDL_ticket *mdl_backup_ticket;
void reset_for_next_command(bool do_clear_errors= 1);
/*
@ -2978,6 +2965,7 @@ public:
uint tmp_table, global_disable_checkpoint;
uint server_status,open_options;
enum enum_thread_type system_thread;
enum backup_stages current_backup_stage;
/*
Current or next transaction isolation level.
When a connection is established, the value is taken from
@ -3615,6 +3603,15 @@ public:
{
return server_status & SERVER_STATUS_IN_TRANS;
}
void give_protection_error();
inline bool has_read_only_protection()
{
if (current_backup_stage == BACKUP_FINISHED &&
!global_read_lock.is_acquired())
return FALSE;
give_protection_error();
return TRUE;
}
inline bool fill_derived_tables()
{
return !stmt_arena->is_stmt_prepare() && !lex->only_view_structure();