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MDEV-20907 Set innodb_log_files_in_group=1 by default

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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.
This commit is contained in:
Marko Mäkelä
2019-10-28 17:11:10 +02:00
parent 3043f38436
commit 613e9e7d4d
24 changed files with 59 additions and 66 deletions
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9
mysql-test/suite/encryption/r/innodb_encrypt_log_corruption.result
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@@ -21,7 +21,7 @@ AND support IN ('YES', 'DEFAULT', 'ENABLED');
ENGINE SUPPORT COMMENT TRANSACTIONS XA SAVEPOINTS
FOUND 1 /InnoDB: Upgrade after a crash is not supported. This redo log was created before MariaDB 10\.2\.2, and it appears corrupted/ in mysqld.1.err
# empty redo log from before MariaDB 10.2.2
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=1m
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=2m
SELECT COUNT(*) FROM INFORMATION_SCHEMA.ENGINES
WHERE engine = 'innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
@@ -130,7 +130,7 @@ AND support IN ('YES', 'DEFAULT', 'ENABLED');
ENGINE SUPPORT COMMENT TRANSACTIONS XA SAVEPOINTS
FOUND 2 /InnoDB: Missing MLOG_FILE_NAME or MLOG_FILE_DELETE before MLOG_CHECKPOINT for tablespace 42/ in mysqld.1.err
# Empty 10.3 redo log
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=1m
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=2m
SELECT COUNT(*) FROM INFORMATION_SCHEMA.ENGINES
WHERE engine = 'innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
@@ -138,7 +138,7 @@ COUNT(*)
1
FOUND 1 /InnoDB: .* started; log sequence number 121397[09]/ in mysqld.1.err
# Empty 10.2 redo log
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=1m
# restart: --innodb-data-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-log-group-home-dir=MYSQLTEST_VARDIR/tmp/log_corruption --innodb-force-recovery=5 --innodb-log-file-size=2m
SELECT COUNT(*) FROM INFORMATION_SCHEMA.ENGINES
WHERE engine = 'innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
@@ -151,9 +151,8 @@ SELECT COUNT(*) `1` FROM INFORMATION_SCHEMA.ENGINES WHERE engine='innodb'
AND support IN ('YES', 'DEFAULT', 'ENABLED');
1
1
FOUND 1 /InnoDB: Encrypting redo log/ in mysqld.1.err
NOT FOUND /InnoDB: Encrypting redo log/ in mysqld.1.err
# restart
ib_buffer_pool
ib_logfile0
ib_logfile1
ibdata1