Since MDEV-23855 InnoDB can do checkpoints much more rarely. This improves performance under write-heavy load, but makes mariadb-backup create huge incremental backups (since the last checkpoint).
One way to solve it would be to let mariadb-backup to force an InnoDB checkpoint before a backup. There are many ways of doing it, innodb.page_cleaner test shows one of them, marko knows more. Perhaps it should be optional, but, likely, enabled by default.
Alternatively, InnoDB can force a checkpoint automatically when entering a certain backup stage.
would be the best approach. It clearly says what's to be done, doesn't make any system-wide changes that need to be restored (so, no problems if the client suddenly disconnects). Let's do that?
Sergei Golubchik
added a comment - I think that
SET GLOBAL innodb_log_checkpoint_now= ON ;
would be the best approach. It clearly says what's to be done, doesn't make any system-wide changes that need to be restored (so, no problems if the client suddenly disconnects). Let's do that?
brevilo, I don’t think that setting innodb_log_buffer_size larger than a few megabytes should help at all. The parameter innodb_log_file_size should be much more relevant.
Marko Mäkelä
added a comment - brevilo , I don’t think that setting innodb_log_buffer_size larger than a few megabytes should help at all. The parameter innodb_log_file_size should be much more relevant.
Ooops, my bad, I meant innodb_log_file_size = 64 GB, not innodb_log_buffer_size (still at the default of 16 MB!).
I fixed my previous comment above but since that was meant as a reply to your's it kind of lost its context now Maybe it helps anyway...
Oliver Bock
added a comment - - edited Ooops, my bad, I meant innodb_log_file_size = 64 GB , not innodb_log_buffer_size (still at the default of 16 MB!).
I fixed my previous comment above but since that was meant as a reply to your's it kind of lost its context now Maybe it helps anyway...
I introduced the parameter --skip-innodb-log-checkpoint-on to backup, so that the extra checkpoint at the start of the backup can be avoided when necessary. This is necessary in the regression test encryption.doublewrite_debug.
Marko Mäkelä
added a comment - I introduced the parameter --skip-innodb-log-checkpoint-on to backup, so that the extra checkpoint at the start of the backup can be avoided when necessary. This is necessary in the regression test encryption.doublewrite_debug .
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Marko Mäkelä
Sergei Golubchik
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Bug
Critical
MDEV-36254 Document MDEV-30000: make mariadb-backup force an innodb checkpoint
Maybe it helps anyway...
I think that
would be the best approach. It clearly says what's to be done, doesn't make any system-wide changes that need to be restored (so, no problems if the client suddenly disconnects). Let's do that?