Hello,
When running backup during ongoing ALTER operation backup fails with error:
[00] FATAL ERROR: 2024-02-02 10:16:28 Was only able to copy log from 2825766826 to 2892744515, not 3030682034; try increasing innodb_log_file_size
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Attached full log.
It is easy to reproduce issue. In my test case I used all the defaults running simple rebuild on a table.
+-----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| test_data | CREATE TABLE `test_data` (
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`id` int(11) NOT NULL AUTO_INCREMENT,
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`data` varchar(255) DEFAULT NULL,
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PRIMARY KEY (`id`)
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) ENGINE=InnoDB AUTO_INCREMENT=10000015 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci |
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+-----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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1 row in set (0.000 sec)
|
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MariaDB [testdb]> select * from test_data limit 5;
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+----+-----------------------+
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| id | data |
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+----+-----------------------+
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| 1 | This is a test string |
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| 2 | This is a test string |
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| 3 | This is a test string |
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| 4 | This is a test string |
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| 5 | This is a test string |
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+----+-----------------------+
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5 rows in set (0.001 sec)
|
|
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MariaDB [testdb]> select count(*) from test_data;
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+----------+
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| count(*) |
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+----------+
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| 10000014 |
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+----------+
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1 row in set (9.947 sec)
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## SESSION 1
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MariaDB [testdb]> alter table test_data engine=innodb;
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Query OK, 0 rows affected (1 min 2.641 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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## SESSION 2
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mariabackup --backup --target-dir=/backup --user=root --password=root
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The same error happens on a server with workload and bigger log file size.
Received the same error on Percona (5.7.42) with xtrabackup, just error log was slightly different:
240202 11:19:36 >> log scanned up to (1948476139)
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InnoDB: Last flushed lsn: 1947667398 load_index lsn 1948481497
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InnoDB: An optimized (without redo logging) DDL operation has been performed. All modified pages may not have been flushed to the disk yet.
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PXB will not be able to make a consistent backup. Retry the backup operation
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I am not sure if this is a bug.
If this is expected behavior what actions should we do to avoid backup failures.
Increase innodb_log_file_size? Change other parameters?
Thank you
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