[MDEV-8303] Dumping buffer pool noisy in the logs. - Jira

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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