• Julius Goryavsky's avatar
    MDEV-18863: Galera SST scripts can't read [mysqldN] option groups · 137d8ed3
    Julius Goryavsky authored
    Some users and some scripts (for example, mysqld_multi.sh) use special
    option groups with names like [mysqld1], [mysqld2], ..., [mysqldN].
    
    But SST scripts can't currently fully support these option groups.
    The only option group-related value it gets from the server is
    --defaults-group-suffix, if that option was set for mysqld when
    the server was started.
    
    However, the SST scripts does not get told by the server to read
    these option groups, so this means that the SST script will fail
    to read options like innodb-data-home-dir when it is in a option
    group like [mysqld1]...[mysqldN].
    
    Moreover, SST scripts ignore many parameters that can be passed
    to them explicitly and cannot transfer them further, for example,
    to the input of mariabackup utility. Ideally, we want to transfer
    all the parameters of the original mysqld call to utilities such
    as mariabackup, however the SST script does not receive these
    parameters from the server and therefore cannot transfer them to
    mariabackup.
    
    To correct these shortcomings, we need to transfer to the scripts
    all of the parameters of the original mysqld call, and in the SST
    scripts themselves provide for the transfer all of these parameters
    to utilities such as mariabackup. To prevent these parameters from
    mixing with the script's own parameters, they should be transferred
    to SST script after the special option "--mysqld-args", followed by
    the string argument with the original parameters, as it received by
    the mysqld call at the time of launch (further all these parameters
    will be passed to mariabackup, for example).
    
    In addition, the SST scripts themselves must be refined so that
    they can read the parameters from the user-selected group, not just
    from the global mysqld configuration group. And also so that they
    can receive the parameters (which important for their work) as
    command-line arguments.
    137d8ed3
wsrep_sst_mariabackup.sh 36.5 KB