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MXS-1712 Add reset replication to MariaDB Monitor

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The 'reset_replication' module command deletes all slave connections and binlogs,
sets gtid to sequence 0 and restarts replication from the given master. Should be
only used if gtid:s are incompatible but the actual data is known to be in sync.
This commit is contained in:
Esa Korhonen
2018-09-04 12:23:19 +03:00
parent cb54880b99
commit 56c84541df
5 changed files with 231 additions and 3 deletions
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50
server/modules/monitor/mariadbmon/mariadbmon.cc
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@ -822,6 +822,17 @@ bool MariaDBMonitor::run_manual_rejoin(SERVER* rejoin_server, json_t** error_out
return send_ok && rval;
}
bool MariaDBMonitor::run_manual_reset_replication(SERVER* master_server, json_t** error_out)
{
bool rval = false;
bool send_ok = execute_manual_command([this, &rval, master_server, error_out]() {
rval = manual_reset_replication(master_server, error_out);
}, error_out);
return send_ok && rval;
}
/**
* Command handler for 'switchover'
*
@ -908,6 +919,28 @@ bool handle_manual_rejoin(const MODULECMD_ARG* args, json_t** output)
return rv;
}
bool handle_manual_reset_replication(const MODULECMD_ARG* args, json_t** output)
{
mxb_assert(args->argc >= 1);
mxb_assert(MODULECMD_GET_TYPE(&args->argv[0].type) == MODULECMD_ARG_MONITOR);
mxb_assert(args->argc == 1 || MODULECMD_GET_TYPE(&args->argv[1].type) == MODULECMD_ARG_SERVER);
bool rv = false;
if (config_get_global_options()->passive)
{
PRINT_MXS_JSON_ERROR(output, "Replication reset requested but not performed, as MaxScale is in "
"passive mode.");
}
else
{
MXS_MONITOR* mon = args->argv[0].value.monitor;
SERVER* server = args->argv[1].value.server;
auto handle = static_cast<MariaDBMonitor*>(mon->instance);
rv = handle->run_manual_reset_replication(server, output);
}
return rv;
}
string monitored_servers_to_string(const ServerArray& servers)
{
string rval;
@ -1000,6 +1033,23 @@ extern "C" MXS_MODULE* MXS_CREATE_MODULE()
rejoin_argv,
"Rejoin server to a cluster");
static modulecmd_arg_type_t reset_gtid_argv[] =
{
{
MODULECMD_ARG_MONITOR | MODULECMD_ARG_NAME_MATCHES_DOMAIN,
ARG_MONITOR_DESC
},
{MODULECMD_ARG_SERVER | MODULECMD_ARG_OPTIONAL, "Master server (optional)"}
};
modulecmd_register_command(MXS_MODULE_NAME,
"reset_replication",
MODULECMD_TYPE_ACTIVE,
handle_manual_reset_replication,
MXS_ARRAY_NELEMS(reset_gtid_argv), reset_gtid_argv,
"Delete slave connections, delete binary logs and "
"set up replication (dangerous)");
static MXS_MODULE info =
{
MXS_MODULE_API_MONITOR,