mysql 5.6新機能slave_parallel_workersを設定する際の注意
mysql 5.6新機能slave_parallel_workersを設定する際の注意
Multi-threaded Slavesを使ってみようと設定したときにはまったのでそこを記載。
slaveのmy.cnfに下記を追加
relay_log_info_repository = TABLE master_info_repository = TABLE slave_checkpoint_group = 524281 slave_parallel_workers = 4
slaveを再起動するとエラーログに下記のエラーが出る
120331 12:18:52 [ERROR] Failed to open the relay log './inst2-5-4-6_1-relay-bin.000050' (relay_log_pos 275). 120331 12:18:52 [ERROR] Could not find target log during relay log initialization. 120331 12:18:52 [ERROR] Failed to initialize the master info structure
slave status
Slave_SQL_RunningがNoになりエラーメッセージでFailed during slave workers initializationが。
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: localhost
Master_User: replicator
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: inst1-5-6-4_1-bin.000005
Read_Master_Log_Pos: 610703806
Relay_Log_File: inst2-5-4-6_1-relay-bin.000026
Relay_Log_Pos: 275
Relay_Master_Log_File: inst1-5-6-4_1-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB: db1,db2,db3,db4
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1593
Last_Error: Failed during slave workers initialization
Skip_Counter: 0
Exec_Master_Log_Pos: 610703806
Relay_Log_Space: 1110
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 1593
Last_SQL_Error: Failed during slave workers initialization
Replicate_Ignore_Server_Ids:
Master_Server_Id: 3307
Master_UUID: f1ef071a-7630-11e1-bae5-00226862863d
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 120325 22:53:45
Master_SSL_Crl:
Master_SSL_Crlpath:
1 row in set (0.00 sec)
relay-log.infoの削除
[Bug #64026]
[bzr push into mysql-trunk branch]
色々エラーメッセージを便りに調べてみたけどイマイチわからない。
Bug #64026の内容からもしかしてrelay_log_info_repository = TABLEにしたら
relay-log.infoっていらない？と思いslaveを停止（service mysql stop）し下のrelay-log.infoを削除（rm relay-log.info.*）
-rw-rw---- 1 mysql mysql 81 3月 25 22:56 relay-log.info.0 -rw-rw---- 1 mysql mysql 81 3月 25 22:56 relay-log.info.1 -rw-rw---- 1 mysql mysql 225 3月 31 10:41 relay-log.info.2 -rw-rw---- 1 mysql mysql 227 3月 31 10:43 relay-log.info.3
＊ slaveを起動
無事エラーなくslave_parallel_workers用のプロセスも無事起動された。
注：Checkpoint_group_bitmapだけ削除してます。
mysql> select * from mysql.slave_worker_info\G
*************************** 1. row ***************************
Master_id: 3308
Worker_id: 0
Relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Relay_log_pos: 180094449
Master_log_name: inst1-5-6-4_1-bin.000006
Master_log_pos: 681610195
Checkpoint_relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Checkpoint_relay_log_pos: 180094138
Checkpoint_master_log_name: inst1-5-6-4_1-bin.000006
Checkpoint_master_log_pos: 681609884
Checkpoint_seqno: 0
Checkpoint_group_size: 65535
*************************** 2. row ***************************
Master_id: 3308
Worker_id: 1
Relay_log_name: ./inst2-5-6-4_1-relay-bin.000014
Relay_log_pos: 334663893
Master_log_name: inst1-5-6-4_1-bin.000006
Master_log_pos: 501515938
Checkpoint_relay_log_name: ./inst2-5-6-4_1-relay-bin.000014
Checkpoint_relay_log_pos: 334568336
Checkpoint_master_log_name: inst1-5-6-4_1-bin.000006
Checkpoint_master_log_pos: 501420381
Checkpoint_seqno: 510
Checkpoint_group_size: 65535
*************************** 3. row ***************************
Master_id: 3308
Worker_id: 2
Relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Relay_log_pos: 180094138
Master_log_name: inst1-5-6-4_1-bin.000006
Master_log_pos: 681609884
Checkpoint_relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Checkpoint_relay_log_pos: 178505386
Checkpoint_master_log_name: inst1-5-6-4_1-bin.000006
Checkpoint_master_log_pos: 680021132
Checkpoint_seqno: 8495
Checkpoint_group_size: 65535
*************************** 4. row ***************************
Master_id: 3308
Worker_id: 3
Relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Relay_log_pos: 195502175
Master_log_name: inst1-5-6-4_1-bin.000006
Master_log_pos: 697017921
Checkpoint_relay_log_name: ./inst2-5-6-4_1-relay-bin.000016
Checkpoint_relay_log_pos: 195501801
Checkpoint_master_log_name: inst1-5-6-4_1-bin.000006
Checkpoint_master_log_pos: 697017547
Checkpoint_seqno: 1
Checkpoint_group_size: 65535
4 rows in set (0.00 sec
slave status
こちらもSlave_SQL_RunningがYESとなりエラーなく稼働
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: localhost
Master_User: replicator
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: inst1-5-6-4_1-bin.000006
Read_Master_Log_Pos: 884314089
Relay_Log_File: inst2-5-6-4_1-relay-bin.000016
Relay_Log_Pos: 382796286
Relay_Master_Log_File: inst1-5-6-4_1-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: db1,db2,db3,db4
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 884312032
Relay_Log_Space: 382798514
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 3307
Master_UUID: f1ef071a-7630-11e1-bae5-00226862863d
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
1 row in set (0.00 sec)
