database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

MDEV-16952 Introduce SET GLOBAL innodb_max_purge_lag_wait

Browse Source 
Let us introduce a dummy variable innodb_max_purge_lag_wait
for waiting that the InnoDB history list length is below
the user-specified limit. Specifically,

SET GLOBAL innodb_max_purge_lag_wait=0;

should wait for all history to be purged. This could be useful
when upgrading from an older version to MariaDB 10.3 or later,
to avoid hitting MDEV-15912.

Note: the history cannot be purged if there exist transactions
that may see old versions.

Reviewed by: Vladislav Vaintroub
This commit is contained in:
Marko Mäkelä
2020-10-27 15:35:04 +02:00
parent 8761571a71
commit 42e1815ad8
3 changed files with 47 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
mysql-test/suite/innodb/include/wait_all_purged.inc
View File

@ -1,25 +1,17 @@
# Wait for everything to be purged.
# The user should have set innodb_purge_rseg_truncate_frequency=1.
--disable_query_log
if (!$wait_all_purged)
{
let $wait_all_purged= 0;
SET GLOBAL innodb_max_purge_lag_wait= 0;
}
let $remaining_expect= `select concat('InnoDB ',$wait_all_purged)`;
let $wait_counter= 600;
while ($wait_counter)
if ($wait_all_purged)
{
--replace_regex /.*History list length ([0-9]+).*/\1/
let $remaining= `SHOW ENGINE INNODB STATUS`;
if ($remaining == $remaining_expect)
{
let $wait_counter= 0;
}
if ($wait_counter)
{
real_sleep 0.1;
dec $wait_counter;
}
eval SET GLOBAL innodb_max_purge_lag_wait= $wait_all_purged;
}
--enable_query_log
--replace_regex /.*History list length ([0-9]+).*/\1/
let $remaining= `SHOW ENGINE INNODB STATUS`;
echo $remaining transactions not purged;