groundbreaking on fail-safe replication - added a token feature to have an

excuse to have a test case. Mental trick to get things moving faster...

mysql-test/mysql-test-run.sh

@@ -591,7 +591,7 @@ start_master()
     if [ -z "$DO_BENCH" ]
     then
       master_args="--no-defaults --log-bin=$MYSQL_TEST_DIR/var/log/master-bin \
-    	    --server-id=1 \
+    	    --server-id=1 --rpl-recovery-rank=1 \
             --basedir=$MY_BASEDIR \
 	    --port=$MASTER_MYPORT \
 	    --exit-info=256 \
@@ -608,7 +608,7 @@ start_master()
 	     $EXTRA_MASTER_OPT $EXTRA_MASTER_MYSQLD_OPT"
     else
       master_args="--no-defaults --log-bin=$MYSQL_TEST_DIR/var/log/master-bin \
-	    --server-id=1 \
+	    --server-id=1 --rpl-recovery-rank=1 \
             --basedir=$MY_BASEDIR \
 	    --port=$MASTER_MYPORT \
             --datadir=$MASTER_MYDDIR \
@@ -663,7 +663,7 @@ start_slave()
 	    --master-host=127.0.0.1 \
 	    --master-password= \
 	    --master-port=$MASTER_MYPORT \
-	    --server-id=2"
+	    --server-id=2 --rpl-recovery-rank=2"
    else
      master_info=$SLAVE_MASTER_INFO
    fi	    

mysql-test/r/rpl_failsafe.result

@@ -0,0 +1,11 @@
+slave stop;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+slave start;
+show variables like 'rpl_recovery_rank';
+Variable_name	Value
+rpl_recovery_rank	1
+show variables like 'rpl_recovery_rank';
+Variable_name	Value
+rpl_recovery_rank	2

mysql-test/t/rpl_failsafe.test

@@ -0,0 +1,5 @@
+source include/master-slave.inc;
+connection master;
+show variables like 'rpl_recovery_rank';
+connection slave;
+show variables like 'rpl_recovery_rank';

sql/mysqld.cc

@@ -330,6 +330,8 @@ const char *sql_mode_str="OFF";
 const char *default_tx_isolation_name;
 enum_tx_isolation default_tx_isolation=ISO_READ_COMMITTED;
 
+uint rpl_recovery_rank=0;
+
 #ifdef HAVE_GEMINI_DB
 const char *gemini_recovery_options_str="FULL";
 #endif
@@ -2606,7 +2608,8 @@ enum options {
                OPT_DO_PSTACK, OPT_REPORT_HOST,
 	       OPT_REPORT_USER, OPT_REPORT_PASSWORD, OPT_REPORT_PORT,
                OPT_SHOW_SLAVE_AUTH_INFO, OPT_OLD_RPL_COMPAT,
-               OPT_SLAVE_LOAD_TMPDIR, OPT_NO_MIX_TYPE
+               OPT_SLAVE_LOAD_TMPDIR, OPT_NO_MIX_TYPE,
+	       OPT_RPL_RECOVERY_RANK
 };
 
 static struct option long_options[] = {
@@ -2731,6 +2734,7 @@ static struct option long_options[] = {
   {"report-user",           required_argument, 0, (int) OPT_REPORT_USER},
   {"report-password",       required_argument, 0, (int) OPT_REPORT_PASSWORD},
   {"report-port",           required_argument, 0, (int) OPT_REPORT_PORT},
+  {"rpl-recovery-rank",     required_argument, 0, (int) OPT_RPL_RECOVERY_RANK},
   {"safe-mode",             no_argument,       0, (int) OPT_SAFE},
   {"safe-show-database",    no_argument,       0, (int) OPT_SAFE_SHOW_DB},
   {"safe-user-create",	    no_argument,       0, (int) OPT_SAFE_USER_CREATE},
@@ -3030,6 +3034,7 @@ struct show_var_st init_vars[]= {
   {"protocol_version",        (char*) &protocol_version,            SHOW_INT},
   {"record_buffer",           (char*) &my_default_record_cache_size,SHOW_LONG},
   {"record_rnd_buffer",       (char*) &record_rnd_cache_size,	    SHOW_LONG},
+  {"rpl_recovery_rank",       (char*) &rpl_recovery_rank,           SHOW_LONG},
   {"query_buffer_size",       (char*) &query_buff_size,		    SHOW_LONG},
   {"safe_show_database",      (char*) &opt_safe_show_db,            SHOW_BOOL},
   {"server_id",               (char*) &server_id,		    SHOW_LONG},
@@ -3450,6 +3455,9 @@ static void get_options(int argc,char **argv)
       safemalloc_mem_limit = atoi(optarg);
 #endif      
       break;
+    case OPT_RPL_RECOVERY_RANK:
+      rpl_recovery_rank=atoi(optarg);
+      break;
     case OPT_SLAVE_LOAD_TMPDIR:
       slave_load_tmpdir = my_strdup(optarg, MYF(MY_FAE));
       break;