MariaDB 10 Parallel Replication — Latency Test Results

Test Parameters:
sysbench  --test=/root/sysbench0.5/sysbench/tests/db/insert.lua 
--mysql-table-engine=innodb --oltp-table-size=1000000 
--max-requests=0 --max-time=300 --num-threads=16 
--oltp-tables-count=10 --report-interval=10 
--mysql-host=10.8.8.100 --mysql-port=3312 --mysql-user=admin 
--mysql-password=123456  --mysql-db=test run
 

10 tables with 1 million rows each, 16 concurrent threads, pure insert operations.

1. MySQL Parameters:
2. sync_binlog = 0
3. innodb_flush_log_at_trx_commit = 0
4. innodb_flush_method = O_DIRECT
5. innodb_flush_neighbors = 1
6. innodb_buffer_pool_size = 10G
7. innodb_io_capacity = 500
8. innodb_log_file_size = 512M
9. innodb_log_files_in_group = 3
10. innodb_log_buffer_size = 16M

Regular Replication Latency:
 

1. Master_Log_File: mysql-bin.000004
2. Read_Master_Log_Pos: 567748597
3. Relay_Log_File: host-100-relay-bin.000005
4. Relay_Log_Pos: 66853042
5. Relay_Master_Log_File: mysql-bin.000003
6. Slave_IO_Running: Yes
7. Slave_SQL_Running: Yes
8. Replicate_Do_DB: 
9. Replicate_Ignore_DB: 
10. Replicate_Do_Table: 
11. Replicate_Ignore_Table: 
12. Replicate_Wild_Do_Table: 
13. Replicate_Wild_Ignore_Table: 
14. Last_Errno: 0
15. Last_Error: 
16. Skip_Counter: 0
17.  

1. Exec_Master_Log_Pos: 469504741select 1024-469504741/1024/1024+567748597/1024/1024;
2. +----------------------------------------------+
3. | 1024-469504741/1024/1024+567748597/1024/1024 |
4. +----------------------------------------------+
5. |                                1117.69264221 |
6. +----------------------------------------------+
7. 1 row in set (0.00 sec)
8. MariaDB [(none)]> 

1117MB still lagging behind

Parallel Replication (8 concurrent threads, GTID mode disabled) Latency:

1. Master_Log_File: mysql-bin.000022
2. Read_Master_Log_Pos: 333773843
3. Relay_Log_File: host-100-relay-bin.000073
4. Relay_Log_Pos: 134217580
5. Relay_Master_Log_File: mysql-bin.000021
6. Slave_IO_Running: Yes
7. Slave_SQL_Running: Yes
8. Replicate_Do_DB: 
9. Replicate_Ignore_DB: 
10. Replicate_Do_Table: 
11. Replicate_Ignore_Table: 
12. Replicate_Wild_Do_Table: 
13. Replicate_Wild_Ignore_Table: 
14. Last_Errno: 0
15. Last_Error: 
16. Skip_Counter: 0
17. Exec_Master_Log_Pos: 722396020

1. MariaDB [(none)]> select 1024-722396020/1024/1024+333773843/1024/1024;
2. +----------------------------------------------+
3. | 1024-722396020/1024/1024+333773843/1024/1024 |
4. +----------------------------------------------+
5. |                                 653.38101101 |
6. +----------------------------------------------+
7. 1 row in set (0.00 sec)

653MB still lagging behind

Parallel Replication (8 concurrent threads, GTID mode enabled) Latency:

1. Master_Log_File: mysql-bin.000002
2. Read_Master_Log_Pos: 365095829
3. Relay_Log_File: host-100-relay-bin.000008
4. Relay_Log_Pos: 134217572
5. Relay_Master_Log_File: mysql-bin.000001
6. Slave_IO_Running: Yes
7. Slave_SQL_Running: Yes
8. Replicate_Do_DB: 
9. Replicate_Ignore_DB: 
10. Replicate_Do_Table: 
11. Replicate_Ignore_Table: 
12. Replicate_Wild_Do_Table: 
13. Replicate_Wild_Ignore_Table: 
14. Last_Errno: 0
15. Last_Error: 
16. Skip_Counter: 0
17. Exec_Master_Log_Pos: 811005100

1. MariaDB [(none)]> select 1024-811005100/1024/1024+365095829/1024/1024;
2. +----------------------------------------------+
3. | 1024-811005100/1024/1024+365095829/1024/1024 |
4. +----------------------------------------------+
5. |                                 598.74778080 |
6. +----------------------------------------------+
7. 1 row in set (0.00 sec)

598MB still lagging behind

Conclusion:

In this test, parallel replication was more than twice as fast as regular replication.