[MDEV-28766] MDEV-28111 breaks innodb_flush_log_at_trx_commit=2 - Jira

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Details

Type: Bug
Status: Closed (View Workflow)
Priority: Critical
Resolution: Fixed
Affects Version/s: 10.8.3, 10.9.1
Fix Version/s: 10.8.4, 10.9.2, 10.10.0
Component/s: Storage Engine - InnoDB
Labels:
None
Environment:
Linux

Description

~~MDEV-28111~~ and specifically commit c4c88307091 breaks the meaning of innodb_flush_log_at_trx_commit = 2 by enabling O_DIRECT for the redo log.

O_DIRECT should not be used when innodb_flush_log_at_trx_commit = 2 is set. Since this variable is dynamic, it has not only to be checked at server startup, but each time the variable is written to.

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sysbench_insert.png
2022-06-07 13:37
6 kB
Axel Schwenke
sysbench_insert2.png
2022-06-09 15:50
7 kB
Axel Schwenke
sysbench_insert3.png
2022-06-09 16:54
11 kB
Axel Schwenke

Issue Links

is caused by

MDEV-28111 Redo log writes are being buffered on Linux for no good reason

Closed

relates to

MDEV-30136 Map innodb_flush_method to new settable Booleans innodb_{log,data}_file_{buffering,write_through}

Closed

MDEV-31642 Upgrade from 10.7 or earlier may crash if innodb_log_file_buffering=OFF

Closed

MDEV-24854 Change innodb_flush_method=O_DIRECT by default

Closed

MDEV-33894 MariaDB does unexpected storage read IO for the redo log

Open

Activity

People

Assignee:: Marko Mäkelä

Reporter:: Axel Schwenke

Votes:: 0 Vote for this issue

Watchers:: 5 Start watching this issue

Dates

Created:: 2022-06-07 13:11

Updated:: 6 days ago 10:21

Resolved:: 2022-06-14 16:07

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