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MDEV-22179 rr(record and replay) support for mtr
This feature adds the support for rr in mtr. These 2 options are added --rr run the mysqld in rr record mode --rr_option= run the rr with custom record option, for multiple options use --rr_option= for each option. For example ./mtr main.view --rr_option=-h --rr_option=-u --rr_option=-c=23 --boot-rr run the mysqld performing bootstrap in rr record mode Recording are stored in mysql-test/var/rr folder. To run recording please run rr replay var/rr/mysql-X Limitations Restart will create a new recording. Repeat will work on same recording , So might be harder to debug. If test create the multiple instance of mariadb all will be stored in var/rr
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