Details
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Type:
Bug
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: 10.1.5
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Fix Version/s: 10.1.6
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Component/s: Storage Engine - InnoDB, Storage Engine - XtraDB
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Labels:None
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Sprint:10.1.6-1
Description
Hi,
Dumping the buffer pool on shutdown is very noisy when having large buffer pool:
[...] 2015-06-10 15:14:43 140091534046976 [Warning] InnoDB: Dumping buffer pool(s) to .//ib_buffer_pool 2015-06-10 15:14:43 140091534046976 [Note] InnoDB: Dumping buffer pool 1/35, page 1/124296 2015-06-10 15:14:43 140091534046976 [Note] InnoDB: Dumping buffer pool 1/35, page 129/124296 [...] 2015-06-10 15:14:45 140091534046976 [Note] InnoDB: Dumping buffer pool 35/35, page 123905/124054 2015-06-10 15:14:45 140091534046976 [Note] InnoDB: Dumping buffer pool 35/35, page 124033/124054 2015-06-10 15:14:45 140091534046976 [Warning] InnoDB: Buffer pool(s) dump completed at 150610 15:14:45 [...]
cat mysqld2.log | wc --lines --bytes 33824 3241720
cat mysqld2.log | grep -v "Dumping buffer pool" | wc --lines --bytes
41 3938
So the logs for the dump account for 3MB and more than 33K lines on a less than 3 seconds dump.
In 10.0.16, I do not have all those lines when doing MariaDB restart:
150611 12:50:05 [Note] /usr/sbin/mysqld: Normal shutdown [...] 150611 12:50:05 [Note] InnoDB: Starting shutdown... 2015-06-11 12:50:06 7ee566df7700 InnoDB: Dumping buffer pool(s) to .//ib_buffer_pool 2015-06-11 12:50:09 7ee566df7700 InnoDB: Buffer pool(s) dump completed at 150611 12:50:09 [...] 150611 12:50:30 [Note] /usr/sbin/mysqld: Shutdown complete [...] 150611 12:50:31 mysqld_safe Starting mysqld_wrapper daemon with databases from [...] [...] Version: '10.0.16-MariaDB-log' socket: 'mysql.sock' port: 3306 MariaDB Server
Thanks for looking into that,
JFG
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I will add a way to select how often buffer pool status dump is printed and set default to 0 i.e. only start and end is printed.
hor: Jan Lindström <jan.lindstrom@mariadb.com>
Date: Thu Jun 18 08:38:33 2015 +0300
MDEV-8303; Dumping buffer pool noisy in the logs.
Added new dynamic configuration variable innodb_buf_dump_status_frequency
to configure how often buffer pool dump status is printed in the logs.
A number between [0, 100] that tells how oftern buffer pool dump status
in percentages should be printed. E.g. 10 means that buffer pool dump
status is printed when every 10% of number of buffer pool pages are
dumped. Default is 0 (only start and end status is printed).
It does not happen in 10.0, or MySQL 5.6/5.7, but in 10.1 it happens both with XtraDB and InnoDB.