MySQL Galeraクラスターストリーミングレプリケーションのガイド：パート2

[email protected][sbtest]#> pager sed -n '/TRANSACTIONS/,/FILE I\/O/p'; show engine innodb status\G nopager; show global status like 'wsrep%flow%'; select count(*) from mysql.wsrep_streaming_log;

PAGER set to 'sed -n '/TRANSACTIONS/,/FILE I\/O/p''

TRANSACTIONS

------------

Trx id counter 568523

Purge done for trx's n:o < 567824 undo n:o < 0 state: running but idle

History list length 23

LIST OF TRANSACTIONS FOR EACH SESSION:

..

...

---TRANSACTION 552701, ACTIVE 216 sec

21587 lock struct(s), heap size 2449616, 1575700 row lock(s), undo log entries 1575700

MySQL thread id 936, OS thread handle 140188019226368, query id 600980 wsrep: applied write set (-1)

--------

FILE I/O

1 row in set (0.28 sec)



PAGER set to stdout

+----------------------------------+--------------+

| Variable_name                    | Value |

+----------------------------------+--------------+

| wsrep_flow_control_paused_ns     | 210755642443 |

| wsrep_flow_control_paused        | 0.0231273 |

| wsrep_flow_control_sent          | 1653 |

| wsrep_flow_control_recv          | 3857 |

| wsrep_flow_control_interval      | [ 173, 173 ] |

| wsrep_flow_control_interval_low  | 173 |

| wsrep_flow_control_interval_high | 173          |

| wsrep_flow_control_status        | OFF |

+----------------------------------+--------------+

8 rows in set (0.01 sec)



+----------+

| count(*) |

+----------+

|    15758 |

+----------+

1 row in set (0.03 sec)

注目すべきことに、フロー制御が開始されました！

また、送受信されたWSREPキューもキックされています：

では、結果について詳しく説明します。 mysql.wsrep_streaming_logテーブルから

[email protected][sbtest]#> pager sed -n '/TRANSACTIONS/,/FILE I\/O/p'|tail -8; show engine innodb status\G nopager;

PAGER set to 'sed -n '/TRANSACTIONS/,/FILE I\/O/p'|tail -8'

MySQL thread id 134822, OS thread handle 140041167468288, query id 0 System lock

---TRANSACTION 649008, ACTIVE 481 sec

mysql tables in use 1, locked 1

53104 lock struct(s), heap size 6004944, 3929602 row lock(s), undo log entries 3876500

MySQL thread id 183, OS thread handle 140041167468288, query id 105367 localhost 127.0.0.1 root updating

delete from sbtest1 where id >= 2000000

--------

FILE I/O

1 row in set (0.01 sec)

次に、結果を取得します

[email protected][sbtest]#> select count(*) from mysql.wsrep_streaming_log;

+----------+

| count(*) |

+----------+

|    38899 |

+----------+

1 row in set (0.40 sec)

[email protected][sbtest]#> select 3876500/38899.0;

+-----------------+

| 3876500/38899.0 |

+-----------------+

|         99.6555 |

+-----------------+

1 row in set (0.03 sec)

[email protected][sbtest]#> delete from sbtest1 where id >= 2000000;

Query OK, 12034538 rows affected (30 min 36.96 sec)

[email protected][sbtest]#> pager sed -n '/TRANSACTIONS/,/FILE I\/O/p'|tail -8; show engine innodb status\G nopager; show global status like 'wsrep%flow%'; select count(*) from mysql.wsrep_streaming_log;

PAGER set to 'sed -n '/TRANSACTIONS/,/FILE I\/O/p'|tail -8'

0 lock struct(s), heap size 1136, 0 row lock(s)

---TRANSACTION 421740651985200, not started

0 lock struct(s), heap size 1136, 0 row lock(s)

---TRANSACTION 553661, ACTIVE (PREPARED) 2050 sec

165631 lock struct(s), heap size 18735312, 12154883 row lock(s), undo log entries 12154883

MySQL thread id 898, OS thread handle 140266050008832, query id 341835 wsrep: preparing to commit write set(215510)

--------

FILE I/O

1 row in set (0.46 sec)



PAGER set to stdout

+----------------------------------+--------------+

| Variable_name                    | Value |

+----------------------------------+--------------+

| wsrep_flow_control_paused_ns     | 290832524304 |

| wsrep_flow_control_paused        | 0 |

| wsrep_flow_control_sent          | 0 |

| wsrep_flow_control_recv          | 0 |

| wsrep_flow_control_interval      | [ 173, 173 ] |

| wsrep_flow_control_interval_low  | 173 |

| wsrep_flow_control_interval_high | 173          |

| wsrep_flow_control_status        | OFF |

+----------------------------------+--------------+

8 rows in set (0.53 sec)



+----------+

| count(*) |

+----------+

|   120345 |

+----------+

1 row in set (0.88 sec)

[email protected][sbtest]#> select 12154883/120345.0;                                                                                                                                                   +-------------------+

| 12154883/120345.0 |

+-------------------+

|          101.0003 |

+-------------------+

1 row in set (0.00 sec)

[email protected][sbtest]#> set wsrep_trx_fragment_size=0;

Query OK, 0 rows affected (0.04 sec)