MDEV-18399 Recognize the deprecated parameters innodb_file_format, innodb_large_prefix

The parameters innodb_file_format and innodb_large_prefix were overridden
in the Debian-distributed configuration files, because the default values
of these parameters between MariaDB 5.5 and MariaDB 10.2
did not make any sense.

To allow a more seamless upgrade from MariaDB 10.1 to later versions,
let InnoDB recognize the parameters innodb_file_format and
innodb_large_prefix and issue deprecation warnings for them if they
are specified. A deprecation period of only one major release
(one year between the MariaDB 10.2 and 10.3 releases) is insufficient
for these widely used parameters.

mysql-test/suite/innodb_zip/r/prefix_index_liftedlimit.result

@@ -1388,7 +1388,7 @@ ALTER TABLE worklog5743 ADD PRIMARY KEY `pk_idx` (col_1_varchar(3000));
 ERROR 23000: Duplicate entry 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' for key 'PRIMARY'
 DROP TABLE worklog5743;
 set global innodb_large_prefix=0;
-ERROR HY000: Unknown system variable 'innodb_large_prefix'
+ERROR HY000: Variable 'innodb_large_prefix' is a read only variable
 CREATE TABLE worklog5743 (
 col_1_varchar VARCHAR (4000) , col_2_varchar VARCHAR (4000) ,
 PRIMARY KEY (col_1_varchar(3072))

mysql-test/suite/innodb_zip/t/prefix_index_liftedlimit.test

@@ -1300,7 +1300,7 @@ ALTER TABLE worklog5743 ADD PRIMARY KEY `pk_idx` (col_1_varchar(3000));
 DROP TABLE worklog5743;
 
 # -----------------------------------------------------------------------------
---error ER_UNKNOWN_SYSTEM_VARIABLE
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
 set global innodb_large_prefix=0;
 CREATE TABLE worklog5743 (
 col_1_varchar VARCHAR (4000) , col_2_varchar VARCHAR (4000) ,

mysql-test/suite/sys_vars/r/sysvars_innodb.result

@@ -904,6 +904,20 @@ NUMERIC_BLOCK_SIZE	0
 ENUM_VALUE_LIST	NULL
 READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
+VARIABLE_NAME	INNODB_FILE_FORMAT
+SESSION_VALUE	NULL
+GLOBAL_VALUE	
+GLOBAL_VALUE_ORIGIN	COMPILE-TIME
+DEFAULT_VALUE	
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	VARCHAR
+VARIABLE_COMMENT	Deprecated parameter with no effect.
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	NULL
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	INNODB_FILE_PER_TABLE
 SESSION_VALUE	NULL
 GLOBAL_VALUE	ON
@@ -1296,6 +1310,20 @@ NUMERIC_BLOCK_SIZE	0
 ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
+VARIABLE_NAME	INNODB_LARGE_PREFIX
+SESSION_VALUE	NULL
+GLOBAL_VALUE	
+GLOBAL_VALUE_ORIGIN	COMPILE-TIME
+DEFAULT_VALUE	
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	VARCHAR
+VARIABLE_COMMENT	Deprecated parameter with no effect.
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	NULL
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	INNODB_LIMIT_OPTIMISTIC_INSERT_DEBUG
 SESSION_VALUE	NULL
 GLOBAL_VALUE	0

storage/innobase/handler/ha_innodb.cc

@@ -206,6 +206,11 @@ static char*	innobase_reset_all_monitor_counter;
 
 static ulong	innodb_flush_method;
 
+/** Deprecated; no effect other than issuing a deprecation warning. */
+static char* innodb_file_format;
+/** Deprecated; no effect other than issuing a deprecation warning. */
+static char* innodb_large_prefix;
+
 /* This variable can be set in the server configure file, specifying
 stopword table to be used */
 static char*	innobase_server_stopword_table;
@@ -3705,6 +3710,17 @@ static int innodb_init_params()
 	char		*default_path;
 	ulong		num_pll_degree;
 
+	if (innodb_large_prefix || innodb_file_format) {
+		const char* p = innodb_file_format
+			? "file_format"
+			: "large_prefix";
+		sql_print_warning("The parameter innodb_%s is deprecated"
+				  " and has no effect."
+				  " It may be removed in future releases."
+				  " See https://mariadb.com/kb/en/library/"
+				  "xtradbinnodb-file-format/", p);
+	}
+
 	/* Check that values don't overflow on 32-bit systems. */
 	if (sizeof(ulint) == 4) {
 		if (innobase_buffer_pool_size > UINT_MAX32) {
@@ -18989,6 +19005,13 @@ static MYSQL_SYSVAR_ENUM(flush_method, innodb_flush_method,
   NULL, NULL, IF_WIN(SRV_ALL_O_DIRECT_FSYNC, SRV_FSYNC),
   &innodb_flush_method_typelib);
 
+static MYSQL_SYSVAR_STR(file_format, innodb_file_format,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  "Deprecated parameter with no effect.", NULL, NULL, NULL);
+static MYSQL_SYSVAR_STR(large_prefix, innodb_large_prefix,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  "Deprecated parameter with no effect.", NULL, NULL, NULL);
+
 static MYSQL_SYSVAR_BOOL(force_load_corrupted, srv_load_corrupted,
   PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
   "Force InnoDB to load metadata of corrupted table.",
@@ -20033,6 +20056,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(read_io_threads),
   MYSQL_SYSVAR(write_io_threads),
   MYSQL_SYSVAR(file_per_table),
+  MYSQL_SYSVAR(file_format), /* deprecated in MariaDB 10.2; no effect */
   MYSQL_SYSVAR(flush_log_at_timeout),
   MYSQL_SYSVAR(flush_log_at_trx_commit),
   MYSQL_SYSVAR(flush_method),
@@ -20046,6 +20070,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(ft_min_token_size),
   MYSQL_SYSVAR(ft_num_word_optimize),
   MYSQL_SYSVAR(ft_sort_pll_degree),
+  MYSQL_SYSVAR(large_prefix), /* deprecated in MariaDB 10.2; no effect */
   MYSQL_SYSVAR(force_load_corrupted),
   MYSQL_SYSVAR(lock_schedule_algorithm),
   MYSQL_SYSVAR(locks_unsafe_for_binlog),