Details
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Task
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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None
Description
MariaDB 10.5 introduced yet another way to monitor metadata lock, via performance_schema.metadata_locks table. MySQL manual (https://dev.mysql.com/doc/refman/5.7/en/performance-schema-metadata-locks-table.html) can be used to find out what is presented there, but unfortunately there are different/new metadata lock types introduced in MariaDB and one may get the output like this:
MariaDB [performance_schema]> select * from metadata_locks limit 5\G
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*************************** 1. row ***************************
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OBJECT_TYPE: TABLE
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OBJECT_SCHEMA: sbtest
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OBJECT_NAME: sbtest1
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OBJECT_INSTANCE_BEGIN: 140032787904800
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LOCK_TYPE: SHARED_WRITE
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LOCK_DURATION: TRANSACTION
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LOCK_STATUS: GRANTED
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SOURCE:
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OWNER_THREAD_ID: 34
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OWNER_EVENT_ID: 1
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*************************** 2. row ***************************
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OBJECT_TYPE: BACKUP
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OBJECT_SCHEMA: NULL
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OBJECT_NAME: NULL
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OBJECT_INSTANCE_BEGIN: 140032778203712
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LOCK_TYPE: BACKUP_TRANS_DML
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LOCK_DURATION: STATEMENT
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LOCK_STATUS: GRANTED
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SOURCE:
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OWNER_THREAD_ID: 34
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OWNER_EVENT_ID: 1
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*************************** 3. row ***************************
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OBJECT_TYPE: TABLE
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OBJECT_SCHEMA: sbtest
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OBJECT_NAME: sbtest1
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OBJECT_INSTANCE_BEGIN: 140033249782768
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LOCK_TYPE: SHARED_WRITE
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LOCK_DURATION: TRANSACTION
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LOCK_STATUS: GRANTED
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SOURCE:
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OWNER_THREAD_ID: 33
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OWNER_EVENT_ID: 1
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*************************** 4. row ***************************
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OBJECT_TYPE: BACKUP
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OBJECT_SCHEMA: NULL
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OBJECT_NAME: NULL
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OBJECT_INSTANCE_BEGIN: 140033248057584
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LOCK_TYPE: BACKUP_TRANS_DML
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LOCK_DURATION: STATEMENT
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LOCK_STATUS: GRANTED
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SOURCE:
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OWNER_THREAD_ID: 33
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OWNER_EVENT_ID: 1
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*************************** 5. row ***************************
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OBJECT_TYPE: TABLE
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OBJECT_SCHEMA: sbtest
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OBJECT_NAME: sbtest1
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OBJECT_INSTANCE_BEGIN: 140033449398688
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LOCK_TYPE: SHARED_WRITE
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LOCK_DURATION: TRANSACTION
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LOCK_STATUS: GRANTED
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SOURCE:
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OWNER_THREAD_ID: 32
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OWNER_EVENT_ID: 1
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5 rows in set (0,001 sec)
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that includes BACKUP_TRANS_DML, BACKUP_START, BACKUP_FTWRL1 etc types of locks with OBJECT_TYPE =- BACKUP that upstream documentation does not cover in any way.
This is a request to properly document the content of this new P_S table, including all object rypes and all types of metadata locks with compatibility matrix for them if possible.
Attachments
Issue Links
- is implemented by
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