WL#6808: InnoDB: Deprecate and remove innodb_mirrored_log_groups
Affects: Server-5.7 — Status: Complete — Priority: Medium
Deprecate innodb_mirrored_log_groups. Background: the allowed range of the parameter innodb_mirrored_log_groups is 1..10, but there has always been (at least since 3.23.53) a check in InnoDB startup that refuses any other value than 1. This is not meaningful and we should deprecate this variable in GA versions and remove it in a later release.
Per Server PT decison and a post-meeting discussion with Support: Throw a deprecation message in 5.6 and remove completely in 5.7 5.6 : ====== When Innodb_mirrored_log_groups !=1, abort with the following error message "Innodb_mirrored_log_groups is an unimplemented feature and the variable will be completely removed in a future version. Using values other than 1 is not supported." When Innodb_mirrored_log_groups == 1, WARN and continue with the following error message "Innodb_mirrored_log_groups is an unimplemented feature and the variable will be completely removed in a future version." When Innodb_mirrored_log_groups is NOT passed, do nothing. 5.7 === Remove all mention and give usual unknown variable errors.
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