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MDEV-23474 InnoDB fails to restart after SET GLOBAL innodb_log_checksums=OFF

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Regretfully, the parameter innodb_log_checksums was introduced
in MySQL 5.7.9 (the first GA release of that series) by
mysql/mysql-server@af0acedd88
which partly replaced a parameter that had been introduced in 5.7.8
mysql/mysql-server@22ba38218e
as innodb_log_checksum_algorithm.

Given that the CRC-32C operations are accelerated on many processor
implementations (AMD64 with SSE4.2; since MDEV-22669 also on IA-32
with SSE4.2, POWER 8 and later, ARMv8 with some extensions)
and by lookup tables when only generic SISD instructions are available,
there should be no valid reason to disable checksums.

In MariaDB 10.5.2, as a preparation for MDEV-12353, MDEV-19543 deprecated
and ignored the parameter innodb_log_checksums altogether. This should
imply that after a clean shutdown with innodb_log_checksums=OFF one
cannot upgrade to MariaDB Server 10.5 at all.

Due to these problems, let us deprecate the parameter innodb_log_checksums
and honor it only during server startup.
The command SET GLOBAL innodb_log_checksums will always set the
parameter to ON.
This commit is contained in:
Marko Mäkelä
2020-08-14 14:52:14 +03:00
parent 8268f26605
commit 4c50120d14
11 changed files with 23 additions and 104 deletions
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2
mysql-test/suite/innodb/r/innodb_xtradb_compat.result
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@ -148,7 +148,7 @@ Warnings:
Warning 1287 Using innodb_log_checksum_algorithm is deprecated and the parameter may be removed in future releases. Ignoning the parameter.
select @@innodb_log_checksum_algorithm, @@innodb_log_checksums;
@@innodb_log_checksum_algorithm @@innodb_log_checksums
NONE 0
STRICT_INNODB 1
set global innodb_log_checksum_algorithm=STRICT_INNODB;
Warnings:
Warning 1287 Using innodb_log_checksum_algorithm is deprecated and the parameter may be removed in future releases. Ignoning the parameter.