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Added new MDL_BACKUP locks for all backup stages

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Part of MDEV-5336 Implement LOCK FOR BACKUP

- Added new locks to MDL_BACKUP for all stages of backup locks and
  a new MDL lock needed for backup stages.
- Renamed MDL_BACKUP_STMT to MDL_BACKUP_DDL
- flush_tables() takes a new parameter that decides what should be flushed.
- InnoDB, Aria (transactional tables with checksums), Blackhole, Federated
  and Federatedx tables are marked to be safe for online backup. We are
  using MDL_BACKUP_TRANS_DML instead of MDL_BACKUP_DML locks for these
  which allows any DML's to proceed for these tables during the whole
  backup process until BACKUP STAGE COMMIT which will block the final
  commit.
This commit is contained in:
Monty
2018-11-06 17:05:24 +02:00
parent f386b70beb
commit 965311ee8b
25 changed files with 574 additions and 126 deletions
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9
sql/sql_insert.cc
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@ -550,7 +550,7 @@ bool open_and_lock_for_insert_delayed(THD *thd, TABLE_LIST *table_list)
if (thd->global_read_lock.can_acquire_protection())
DBUG_RETURN(TRUE);
protection_request.init(MDL_key::BACKUP, "", "", MDL_BACKUP_STMT,
protection_request.init(MDL_key::BACKUP, "", "", MDL_BACKUP_DML,
MDL_STATEMENT);
if (thd->mdl_context.acquire_lock(&protection_request,
@ -2374,9 +2374,12 @@ bool delayed_get_table(THD *thd, MDL_request *grl_protection_request,
di->table_list.alias.str= di->table_list.table_name.str= di->thd.query();
di->table_list.alias.length= di->table_list.table_name.length= di->thd.query_length();
di->table_list.db= di->thd.db;
/* We need the tickets so that they can be cloned in handle_delayed_insert */
/*
We need the tickets so that they can be cloned in
handle_delayed_insert
*/
di->grl_protection.init(MDL_key::BACKUP, "", "",
MDL_BACKUP_STMT, MDL_STATEMENT);
MDL_BACKUP_DML, MDL_STATEMENT);
di->grl_protection.ticket= grl_protection_request->ticket;
init_mdl_requests(&di->table_list);
di->table_list.mdl_request.ticket= table_list->mdl_request.ticket;