| Bug #97560 | idle & caught up slave has old query shown in "Info" section of processlist... | ||
|---|---|---|---|
| Submitted: | 8 Nov 2019 12:32 | Modified: | 4 Feb 2021 15:44 |
| Reporter: | Shane Bester (Platinum Quality Contributor) | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: Replication | Severity: | S3 (Non-critical) |
| Version: | 5.7.29 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
[13 Nov 2020 2:02]
Ye Jinrong
I meet this bug too, but at 8.0.22 version. There are 4 nodes in MGR. mysql> select * from performance_schema.replication_group_members; +---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+ | CHANNEL_NAME | MEMBER_ID | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | +---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+ | group_replication_applier | 2d9a8e67-2004-11eb-a38c-e4434ba52b50 | ndb1 | 3390 | ONLINE | SECONDARY | 8.0.22 | | group_replication_applier | 72fd3fd5-1ffd-11eb-a584-e4434ba52b50 | ndb1 | 3380 | ONLINE | PRIMARY | 8.0.22 | | group_replication_applier | 91f738e8-2000-11eb-a043-e4434ba522fc | ndb2 | 3380 | ONLINE | SECONDARY | 8.0.22 | | group_replication_applier | dd850604-2002-11eb-9b4c-e4434ba522fc | ndb2 | 3390 | ONLINE | SECONDARY | 8.0.22 | +---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+ execute alter user command in primary node mysql> alter user identified by 'yejr'; then in one Secondary node mysql>select @@server_uuid; +--------------------------------------+ | @@server_uuid | +--------------------------------------+ | 91f738e8-2000-11eb-a043-e4434ba522fc | +--------------------------------------+ mysql> pager cat - | grep ALTER mysql> show processlist; | 12 | system user | | NULL | Query | 30 | Slave has read all relay log; waiting for more updates | ALTER USER 'yejr'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*9DB91006131E32B22135599033C6A9C19 | the state will not change until i execute some other command in Primary node.
[4 Feb 2021 15:44]
Margaret Fisher
Posted by developer: Changelog entry added for MySQL 8.0.24: The output of a SHOW PROCESSLIST statement for a replica’s SQL thread sometimes showed the last query as currently being applied when the replica was actually caught up.
Description: Slave is fully caught up and no problem, but it's showing stale info in processlist... It should be blank. mysql> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 127.0.0.1 Master_User: root Master_Port: 3306 Connect_Retry: 60 Master_Log_File: binlog.000566 Read_Master_Log_Pos: 10685956 Relay_Log_File: fc30-relay-bin.001132 Relay_Log_Pos: 10686163 Relay_Master_Log_File: binlog.000566 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: 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: 10685956 Relay_Log_Space: 10686453 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: 1 Master_UUID: d16a795c-0220-11ea-a310-000d6179f72b 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 more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: d16a795c-0220-11ea-a310-000d6179f72b:1-56830 Executed_Gtid_Set: d16a795c-0220-11ea-a310-000d6179f72b:1-56830 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) mysql> show processlist; +----+-------------+-----------------+------+---------+------+--------------------------------------------------------+-------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-------------+-----------------+------+---------+------+--------------------------------------------------------+-------------------------------------------------------------------------------+ | 4 | system user | | NULL | Connect | 634 | Waiting for master to send event | NULL | | 5 | system user | | NULL | Connect | 204 | Slave has read all relay log; waiting for more updates | CREATE USER IF NOT EXISTS 'user2'@'%' IDENTIFIED WITH 'mysql_native_password' | | 7 | root | localhost:47716 | NULL | Sleep | 30 | | NULL | | 8 | root | localhost:48056 | NULL | Query | 0 | starting | show processlist | +----+-------------+-----------------+------+---------+------+--------------------------------------------------------+-------------------------------------------------------------------------------+ 4 rows in set (0.00 sec) Thread stacks also confirmed server is idle. How to repeat: Setup RBR/GTID replication. On master: yes "drop user if exists 'user1'@'%'; create user if not exists 'user1'@'%' IDENTIFIED WITH 'mysql_native_password';" | mysql -uroot -h127.0.0.1 -P3306 after a short while ctrl-c this, and watch the slave catchup, and check processlist and see the last executed query still there. Suggested fix: clear the old query.