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  1. MariaDB Server
  2. MDEV-20907

Set innodb_log_files_in_group=1 by default

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    Description

      Historically, InnoDB split the redo log into at least 2 files. MDEV-12061 allowed the minimum to be innodb_log_files_in_group=1, but it kept the default at innodb_log_files_in_group=2.

      Because performance seems to be slightly better with only one log file, and because implementing an append-only variant of the log would require a single file, let us define the default to be 1, and have innodb_log_file_size=96M, to retain the same default total size of 2×48MiB.

      Note that this variable will be deleted by MDEV-14425!

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          blocks

          Task - A task that needs to be done. MDEV-14425 Change the InnoDB redo log format to reduce write amplification

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          is blocked by

          Task - A task that needs to be done. MDEV-12061 Allow innodb_log_files_in_group=1

          • Major - Major loss of function.
          • Closed
          relates to

          Task - A task that needs to be done. MDEV-21990 Issue a message on changing deprecated innodb_log_files_in_group

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33503 innodb_log_files_in_group is quietly ignored

          • Major - Major loss of function.
          • Confirmed

          Activity

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            marko Marko Mäkelä added a comment -

            In MariaDB Server 10.5.1, the option was deprecated and ignored. That is, MariaDB 10.5 will only support innodb_log_files_in_group=1 and a single redo log file, ib_logfile0.

            marko Marko Mäkelä added a comment - In MariaDB Server 10.5.1, the option was deprecated and ignored. That is, MariaDB 10.5 will only support innodb_log_files_in_group=1 and a single redo log file, ib_logfile0 .
            marko Marko Mäkelä added a comment -

            As part of MDEV-14425 preparations, MariaDB 10.5.1 deprecated the parameter innodb_log_files_in_group and hard-coded the value to 1. The deprecation logic was improved in MDEV-21990.

            marko Marko Mäkelä added a comment - As part of MDEV-14425 preparations, MariaDB 10.5.1 deprecated the parameter innodb_log_files_in_group and hard-coded the value to 1. The deprecation logic was improved in MDEV-21990 .

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              marko Marko Mäkelä
              marko Marko Mäkelä
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