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Code Activity

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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51
mysql-test/main/create_or_replace.result
View File

@ -257,12 +257,13 @@ drop table if exists test.t1,mysqltest2.t2;
Warnings:
Note 1051 Unknown table 'test.t1'
Note 1051 Unknown table 'mysqltest2.t2'
create table test.t1 (i int);
create table test.t1 (i int) engine=myisam;
create table mysqltest2.t2 like test.t1;
lock table test.t1 write, mysqltest2.t2 write;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
@ -274,7 +275,8 @@ Tables_in_test
t2
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
@ -289,7 +291,8 @@ create table mysqltest2.t2 like test.t1;
lock table test.t1 write, mysqltest2.t2 write;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
@ -301,7 +304,8 @@ Tables_in_test
t2
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
@ -311,6 +315,31 @@ select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
create table t1 (i int);
drop table t1;
create table test.t1 (i int) engine=innodb;
create table mysqltest2.t2 like test.t1;
lock table test.t1 write, mysqltest2.t2 write;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_DDL NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
unlock tables;
drop table test.t1,mysqltest2.t2;
create table test.t1 (i int) engine=aria transactional=1 checksum=1;
create table mysqltest2.t2 like test.t1;
lock table test.t1 write, mysqltest2.t2 write;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_DDL NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock mysqltest2
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock mysqltest2 t2
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
unlock tables;
drop table t1;
create table test.t1 (i int);
drop database mysqltest2;
#
# Testing CREATE .. LIKE
@ -398,28 +427,32 @@ create table t1 (a int);
lock table t1 write, t2 read;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
# MDL_SHARED_READ NULL Table metadata lock test t2
create or replace table t1 (i int);
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
# MDL_SHARED_READ NULL Table metadata lock test t2
create or replace table t1 like t2;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
# MDL_SHARED_READ NULL Table metadata lock test t2
create or replace table t1 select 1 as f1;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_BACKUP_STMT NULL Backup lock
# MDL_BACKUP_DDL NULL Backup lock
# MDL_BACKUP_DML NULL Backup lock
# MDL_INTENTION_EXCLUSIVE NULL Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE NULL Table metadata lock test t1
# MDL_SHARED_READ NULL Table metadata lock test t2