FB8-93: output symbolic errno for 'SHOW SLAVE STATUS' (facebook#940) (f…

…acebook#940)

Summary:
JIRA: https://jira.percona.com/browse/FB8-93

Reference Patch: facebook@a2b0c32
Reference Patch: facebook@e82ab5a

 Instead of just showing the errno when running SHOW SLAVE STATUS command, also printing the error name so that user won't have misunderstanding
Pull Request resolved: facebook#940

Reviewed By: lloyd

Differential Revision: D13924591

Pulled By: lth

---------------------------------------------------------------------------------------------

SHOW SLAVE STATUS shows real error

Summary: In parallel replication SHOW SLAVE STATUS doesn't show the actual error. It actually creates the real error (Slave_reporting_capability::va_report) and set m_last_error right after setting coordinator error so we just need to reverse the order of the two and show the real error in coordinator. Accessing the last error is protected by err_lock and also fallback to previous message in case the error number is 0 and can't be trusted, just in case.

Reviewed By: hermanlee, Pushapgl

Differential Revision: D28925760

client/mysqldump.cc

@@ -5390,8 +5390,8 @@ static int do_show_slave_status(MYSQL *mysql_con) {
     const int n_master_host = 1;
     const int n_master_port = 3;
     const int n_master_log_file = 9;
-    const int n_master_log_pos = 21;
-    const int n_channel_name = 55;
+    const int n_master_log_pos = 21 + 1 /* Last_Symbolic_Errno */;
+    const int n_channel_name = 55 + 1 /* Last_Symbolic_Errno */;
     MYSQL_ROW row = mysql_fetch_row(slave);
     /* Since 5.7 is is possible that SSS returns multiple channels */
     while (row) {

include/my_sys.h

@@ -660,6 +660,7 @@ extern void my_osmaperr(unsigned long last_error);
 #endif
 
 extern const char *get_global_errmsg(int nr);
+extern const char *get_global_errname(int nr);
 extern void wait_for_free_space(const char *filename, int errors);
 extern FILE *my_fopen(const char *filename, int Flags, myf MyFlags);
 extern FILE *my_fdopen(File fd, const char *filename, int Flags, myf MyFlags);

include/mysys_err.h

@@ -27,12 +27,17 @@
   @file include/mysys_err.h
 */
 
+struct my_glob_errors {
+  const char *errname; /* error name */
+  const char *errdesc; /* error description */
+};
+
 #define GLOBERRS                                              \
   (EE_ERROR_LAST - EE_ERROR_FIRST + 1) /* Nr of global errors \
                                         */
-#define EE(X) (globerrs[(X)-EE_ERROR_FIRST])
+#define EE(X) (globerrs[(X)-EE_ERROR_FIRST].errdesc)
 
-extern const char *globerrs[]; /* my_error_messages is here */
+extern const struct my_glob_errors globerrs[]; /* my_error_messages is here */
 
 /* Error message numbers in global map */
 /*

mysql-test/include/check-testcase.test

@@ -46,6 +46,7 @@ if ($tmp) {
   --echo Replicate_Wild_Do_Table	#
   --echo Replicate_Wild_Ignore_Table	#
   --echo Last_Errno	0
+  --echo Last_Symbolic_Errno	
   --echo Last_Error	
   --echo Skip_Counter	0
   --echo Exec_Source_Log_Pos	#
@@ -91,7 +92,7 @@ if ($tmp) {
 
 if (!$tmp) {
   # Note: after WL#5177, fields 13-18 shall not be filtered-out.
-  --replace_column 4 # 5 # 6 # 7 # 8 # 9 # 10 # 13 # 14 # 15 # 16 # 17 # 18 # 22 # 23 # 24 # 25 # 26 # 40 # 41 # 42 # 46 # 52 # 53 # 55 # 56 #
+  --replace_column 4 # 5 # 6 # 7 # 8 # 9 # 10 # 13 # 14 # 15 # 16 # 17 # 18 # 23 # 24 # 25 # 26 # 27 # 41 # 42 # 43 # 47 # 53 # 54 # 56 # 57 #
   query_vertical
   SHOW REPLICA STATUS;
 }

mysql-test/r/disabled_replication.result

@@ -1,5 +1,5 @@
 SHOW SLAVE STATUS;
-Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_Do_DB	Replicate_Ignore_DB	Replicate_Do_Table	Replicate_Ignore_Table	Replicate_Wild_Do_Table	Replicate_Wild_Ignore_Table	Last_Errno	Last_Error	Skip_Counter	Exec_Master_Log_Pos	Relay_Log_Space	Until_Condition	Until_Log_File	Until_Log_Pos	Master_SSL_Allowed	Master_SSL_CA_File	Master_SSL_CA_Path	Master_SSL_Cert	Master_SSL_Cipher	Master_SSL_Key	Seconds_Behind_Master	Master_SSL_Verify_Server_Cert	Last_IO_Errno	Last_IO_Error	Last_SQL_Errno	Last_SQL_Error	Replicate_Ignore_Server_Ids	Master_Server_Id	Master_UUID	Master_Info_File	SQL_Delay	SQL_Remaining_Delay	Slave_SQL_Running_State	Master_Retry_Count	Master_Bind	Last_IO_Error_Timestamp	Last_SQL_Error_Timestamp	Master_SSL_Crl	Master_SSL_Crlpath	Retrieved_Gtid_Set	Executed_Gtid_Set	Auto_Position	Replicate_Rewrite_DB	Channel_Name	Master_TLS_Version	Master_public_key_path	Get_master_public_key	Network_Namespace
+Slave_IO_State	Master_Host	Master_User	Master_Port	Connect_Retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_Do_DB	Replicate_Ignore_DB	Replicate_Do_Table	Replicate_Ignore_Table	Replicate_Wild_Do_Table	Replicate_Wild_Ignore_Table	Last_Errno	Last_Symbolic_Errno	Last_Error	Skip_Counter	Exec_Master_Log_Pos	Relay_Log_Space	Until_Condition	Until_Log_File	Until_Log_Pos	Master_SSL_Allowed	Master_SSL_CA_File	Master_SSL_CA_Path	Master_SSL_Cert	Master_SSL_Cipher	Master_SSL_Key	Seconds_Behind_Master	Master_SSL_Verify_Server_Cert	Last_IO_Errno	Last_IO_Error	Last_SQL_Errno	Last_SQL_Error	Replicate_Ignore_Server_Ids	Master_Server_Id	Master_UUID	Master_Info_File	SQL_Delay	SQL_Remaining_Delay	Slave_SQL_Running_State	Master_Retry_Count	Master_Bind	Last_IO_Error_Timestamp	Last_SQL_Error_Timestamp	Master_SSL_Crl	Master_SSL_Crlpath	Retrieved_Gtid_Set	Executed_Gtid_Set	Auto_Position	Replicate_Rewrite_DB	Channel_Name	Master_TLS_Version	Master_public_key_path	Get_master_public_key	Network_Namespace
 Warnings:
 Warning	1287	'SHOW SLAVE STATUS' is deprecated and will be removed in a future release. Please use SHOW REPLICA STATUS instead
 RESET SLAVE;

mysys/errors.cc

@@ -41,106 +41,156 @@
 #include "my_thread_local.h"
 #include "mysys_err.h"
 
-const char *globerrs[GLOBERRS] = {
-    "Can't create/write to file '%s' (OS errno %d - %s)",
-    "Error reading file '%s' (OS errno %d - %s)",
-    "Error writing file '%s' (OS errno %d - %s)",
-    "Error on close of '%s' (OS errno %d - %s)",
-    "Out of memory (Needed %u bytes)",
-    "Error on delete of '%s' (OS errno %d - %s)",
-    "Error on rename of '%s' to '%s' (OS errno %d - %s)",
-    "",
-    "Unexpected EOF found when reading file '%s' (OS errno %d - %s)",
-    "Can't lock file (OS errno %d - %s)",
-    "Can't unlock file (OS errno %d - %s)",
-    "Can't read dir of '%s' (OS errno %d - %s)",
-    "Can't get stat of '%s' (OS errno %d - %s)",
-    "Can't change size of file (OS errno %d - %s)",
-    "Can't open stream from handle (OS errno %d - %s)",
-    "Can't get working directory (OS errno %d - %s)",
-    "Can't change dir to '%s' (OS errno %d - %s)",
-    "Warning: '%s' had %d links",
-    "Warning: %d files and %d streams are left open",
-    "Disk is full writing '%s' (OS errno %d - %s). Waiting for someone to free "
-    "space...",
-    "Can't create directory '%s' (OS errno %d - %s)",
-    "Character set '%s' is not a compiled character set and is not specified "
-    "in the '%s' file",
-    "Out of resources when opening file '%s' (OS errno %d - %s)",
-    "Can't read value for symlink '%s' (Error %d - %s)",
-    "Can't create symlink '%s' pointing at '%s' (Error %d - %s)",
-    "Error on realpath() on '%s' (Error %d - %s)",
-    "Can't sync file '%s' to disk (OS errno %d - %s)",
-    "Collation '%s' is not a compiled collation and is not specified in the "
-    "'%s' file",
-    "File '%s' not found (OS errno %d - %s)",
-    "File '%s' (fileno: %d) was not closed",
-    "Cannot change ownership of the file '%s' (OS errno %d - %s)",
-    "Cannot change permissions of the file '%s' (OS errno %d - %s)",
-    "Cannot seek in file '%s' (OS errno %d - %s)",
-    "Memory capacity exceeded (capacity %llu bytes)",
-    "Disk is full writing '%s' (OS errno %d - %s). Waiting for someone to free "
-    "space... Retry in %d secs. Message reprinted in %d secs.",
-    "Failed to create timer (OS errno %d).",
-    "Failed to delete timer (OS errno %d).",
-    "Failed to create timer queue (OS errno %d).",
-    "Failed to start timer notify thread.",
-    "Failed to create event to interrupt timer notifier thread (OS errno %d).",
-    "Failed to register timer event with queue (OS errno %d), exiting timer "
-    "notifier thread.",
-    "LoadLibrary(\"kernel32.dll\") failed: GetLastError returns %lu.",
-    "%s.",
-    "Failed to determine large page size.",
-    "Error in my_thread_global_end(): %d thread(s) did not exit.",
-    "Failed to create IO completion port (OS errno %d).",
-    "Failed to open required defaults file: %s",
-    "Fatal error in defaults handling. Program aborted!",
-    "Wrong '!%s' directive in config file %s at line %d.",
-    "Skipping '%s' directive as maximum include recursion level was"
-    " reached in file %s at line %d.",
-    "Wrong group definition in config file %s at line %d.",
-    "Found option without preceding group in config file %s at line %d.",
-    "%s should be readable/writable only by current user.",
-    "World-writable config file '%s' is ignored.",
-    "%s: Option '%s' was used, but is disabled.",
-    "%s: Option '-%c' was used, but is disabled.",
-    "Using a password on the command line interface can be insecure.",
-    "Unknown suffix '%c' used for variable '%s' (value '%s').",
-    "SSL error: %s from '%s'.",
-    "SSL error: %s.",
-    "%d  %s.",
-    "Packets out of order (found %u, expected %u).",
-    "Unknown option to protocol: %s.",
-    "Failed to locate server public key '%s'.",
-    "Public key is not in Privacy Enhanced Mail format: '%s'.",
-    "%s.",
-    "unknown variable '%s'.",
-    "unknown option '--%s'.",
-    "%s: unknown option '-%c'.",
-    "%s: option '--%s' cannot take an argument.",
-    "%s: option '--%s' requires an argument.",
-    "%s: option '-%c' requires an argument.",
-    "%s: ignoring option '--%s' due to invalid value '%s'.",
-    "%s: Empty value for '%s' specified.",
-    "%s: Maximum value of '%s' cannot be set.",
-    "option '%s': boolean value '%s' was not recognized. Set to OFF.",
-    "%s: Error while setting value '%s' to '%s'.",
-    "Incorrect integer value: '%s'.",
-    "Incorrect unsigned integer value: '%s'.",
-    "option '%s': signed value %s adjusted to %s.",
-    "option '%s': unsigned value %s adjusted to %s.",
-    "option '%s': value %s adjusted to %s.",
-    "option '%s': value %g adjusted to %g.",
-    "Invalid decimal value for option '%s'.",
-    "%s.",
-    "Failed to reset before a primary ignorable character %s.",
-    "Failed to reset before a tertiary ignorable character %s.",
-    "Shift character out of range: %s.",
-    "Reset character out of range: %s.",
-    "Unknown LDML tag: '%.*s'.",
-    "Failed to reset before a secondary ignorable character %s.",
-    "Stopped processing the '%s' directive in file %s at line %d.",
-    "pthread_kill(thread_id:%lu, signal:%s) returned '%s'."};
+const struct my_glob_errors globerrs[GLOBERRS] = {
+    {"EE_CANTCREATEFILE", "Can't create/write to file '%s' (OS errno %d - %s)"},
+    {"EE_READ", "Error reading file '%s' (OS errno %d - %s)"},
+    {"EE_WRITE", "Error writing file '%s' (OS errno %d - %s)"},
+    {"EE_BADCLOSE", "Error on close of '%s' (OS errno %d - %s)"},
+    {"EE_OUTOFMEMORY", "Out of memory (Needed %u bytes)"},
+    {"EE_DELETE", "Error on delete of '%s' (OS errno %d - %s)"},
+    {"EE_LINK", "Error on rename of '%s' to '%s' (OS errno %d - %s)"},
+    {"", ""},
+    {"EE_EOFERR",
+     "Unexpected EOF found when reading file '%s' (OS errno %d - %s)"},
+    {"EE_CANTLOCK", "Can't lock file (OS errno %d - %s)"},
+    {"EE_CANTUNLOCK", "Can't unlock file (OS errno %d - %s)"},
+    {"EE_DIR", "Can't read dir of '%s' (OS errno %d - %s)"},
+    {"EE_STAT", "Can't get stat of '%s' (OS errno %d - %s)"},
+    {"EE_CANT_CHSIZE", "Can't change size of file (OS errno %d - %s)"},
+    {"EE_CANT_OPEN_STREAM", "Can't open stream from handle (OS errno %d - %s)"},
+    {"EE_GETWD", "Can't get working directory (OS errno %d - %s)"},
+    {"EE_SETWD", "Can't change dir to '%s' (OS errno %d - %s)"},
+    {"EE_LINK_WARNING", "Warning: '%s' had %d links"},
+    {"EE_OPEN_WARNING", "Warning: %d files and %d streams are left open"},
+    {"EE_DISK_FULL",
+     "Disk is full writing '%s' (OS errno %d - %s). Waiting for someone to "
+     "free space..."},
+    {"EE_CANT_MKDIR", "Can't create directory '%s' (OS errno %d - %s)"},
+    {"EE_UNKNOWN_CHARSET",
+     "Character set '%s' is not a compiled character set and is not specified "
+     "in the '%s' file"},
+    {"EE_OUT_OF_FILERESOURCES",
+     "Out of resources when opening file '%s' (OS errno %d - %s)"},
+    {"EE_CANT_READLINK", "Can't read value for symlink '%s' (Error %d - %s)"},
+    {"EE_CANT_SYMLINK",
+     "Can't create symlink '%s' pointing at '%s' (Error %d - %s)"},
+    {"EE_REALPATH", "Error on realpath() on '%s' (Error %d - %s)"},
+    {"EE_SYNC", "Can't sync file '%s' to disk (OS errno %d - %s)"},
+    {"EE_UNKNOWN_COLLATION",
+     "Collation '%s' is not a compiled collation and is not specified in the "
+     "'%s' file"},
+    {"EE_FILENOTFOUND", "File '%s' not found (OS errno %d - %s)"},
+    {"EE_FILE_NOT_CLOSED", "File '%s' (fileno: %d) was not closed"},
+    {"EE_CHANGE_OWNERSHIP",
+     "Cannot change ownership of the file '%s' (OS errno %d - %s)"},
+    {"EE_CHANGE_PERMISSIONS",
+     "Cannot change permissions of the file '%s' (OS errno %d - %s)"},
+    {"EE_CANT_SEEK", "Cannot seek in file '%s' (OS errno %d - %s)"},
+    {"EE_CAPACITY_EXCEEDED", "Memory capacity exceeded (capacity %llu bytes)"},
+    {"EE_DISK_FULL_WITH_RETRY_MSG",
+     "Disk is full writing '%s' (OS errno %d - %s). Waiting for someone to "
+     "free space... Retry in %d secs. Message reprinted in %d secs."},
+    {"EE_FAILED_TO_CREATE_TIMER", "Failed to create timer (OS errno %d)."},
+    {"EE_FAILED_TO_DELETE_TIMER", "Failed to delete timer (OS errno %d)."},
+    {"EE_FAILED_TO_CREATE_TIMER_QUEUE",
+     "Failed to create timer queue (OS errno %d)."},
+    {"EE_FAILED_TO_START_TIMER_NOTIFY_THREAD",
+     "Failed to start timer notify thread."},
+    {"EE_FAILED_TO_CREATE_TIMER_NOTIFY_THREAD_INTERRUPT_EVENT",
+     "Failed to create event to interrupt timer notifier thread (OS errno "
+     "%d)."},
+    {"EE_EXITING_TIMER_NOTIFY_THREAD",
+     "Failed to register timer event with queue (OS errno %d), exiting timer "
+     "notifier thread."},
+    {"EE_WIN_LIBRARY_LOAD_FAILED",
+     "LoadLibrary(\"kernel32.dll\") failed: GetLastError returns %lu."},
+    {"EE_WIN_RUN_TIME_ERROR_CHECK", "%s."},
+    {"EE_FAILED_TO_DETERMINE_LARGE_PAGE_SIZE",
+     "Failed to determine large page size."},
+    {"EE_FAILED_TO_KILL_ALL_THREADS",
+     "Error in my_thread_global_end(): %d thread(s) did not exit."},
+    {"EE_FAILED_TO_CREATE_IO_COMPLETION_PORT",
+     "Failed to create IO completion port (OS errno %d)."},
+    {"EE_FAILED_TO_OPEN_DEFAULTS_FILE",
+     "Failed to open required defaults file: %s"},
+    {"EE_FAILED_TO_HANDLE_DEFAULTS_FILE",
+     "Fatal error in defaults handling. Program aborted!"},
+    {"EE_WRONG_DIRECTIVE_IN_CONFIG_FILE",
+     "Wrong '!%s' directive in config file %s at line %d."},
+    {"EE_SKIPPING_DIRECTIVE_DUE_TO_MAX_INCLUDE_RECURSION",
+     "Skipping '%s' directive as maximum include recursion level was"
+     " reached in file %s at line %d."},
+    {"EE_INCORRECT_GRP_DEFINITION_IN_CONFIG_FILE",
+     "Wrong group definition in config file %s at line %d."},
+    {"EE_OPTION_WITHOUT_GRP_IN_CONFIG_FILE",
+     "Found option without preceding group in config file %s at line %d."},
+    {"EE_CONFIG_FILE_PERMISSION_ERROR",
+     "%s should be readable/writable only by current user."},
+    {"EE_IGNORE_WORLD_WRITABLE_CONFIG_FILE",
+     "World-writable config file '%s' is ignored."},
+    {"EE_USING_DISABLED_OPTION", "%s: Option '%s' was used, but is disabled."},
+    {"EE_USING_DISABLED_SHORT_OPTION",
+     "%s: Option '-%c' was used, but is disabled."},
+    {"EE_USING_PASSWORD_ON_CLI_IS_INSECURE",
+     "Using a password on the command line interface can be insecure."},
+    {"EE_UNKNOWN_SUFFIX_FOR_VARIABLE",
+     "Unknown suffix '%c' used for variable '%s' (value '%s')."},
+    {"EE_SSL_ERROR_FROM_FILE", "SSL error: %s from '%s'."},
+    {"EE_SSL_ERROR", "SSL error: %s."},
+    {"EE_NET_SEND_ERROR_IN_BOOTSTRAP", "%d  %s."},
+    {"EE_PACKETS_OUT_OF_ORDER",
+     "Packets out of order (found %u, expected %u)."},
+    {"EE_UNKNOWN_PROTOCOL_OPTION", "Unknown option to protocol: %s."},
+    {"EE_FAILED_TO_LOCATE_SERVER_PUBLIC_KEY",
+     "Failed to locate server public key '%s'."},
+    {"EE_PUBLIC_KEY_NOT_IN_PEM_FORMAT",
+     "Public key is not in Privacy Enhanced Mail format: '%s'."},
+    {"EE_DEBUG_INFO", "%s."},
+    {"EE_UNKNOWN_VARIABLE", "unknown variable '%s'."},
+    {"EE_UNKNOWN_OPTION", "unknown option '--%s'."},
+    {"EE_UNKNOWN_SHORT_OPTION", "%s: unknown option '-%c'."},
+    {"EE_OPTION_WITHOUT_ARGUMENT",
+     "%s: option '--%s' cannot take an argument."},
+    {"EE_OPTION_REQUIRES_ARGUMENT", "%s: option '--%s' requires an argument."},
+    {"EE_SHORT_OPTION_REQUIRES_ARGUMENT",
+     "%s: option '-%c' requires an argument."},
+    {"EE_OPTION_IGNORED_DUE_TO_INVALID_VALUE",
+     "%s: ignoring option '--%s' due to invalid value '%s'."},
+    {"EE_OPTION_WITH_EMPTY_VALUE", "%s: Empty value for '%s' specified."},
+    {"EE_FAILED_TO_ASSIGN_MAX_VALUE_TO_OPTION",
+     "%s: Maximum value of '%s' cannot be set."},
+    {"EE_INCORRECT_BOOLEAN_VALUE_FOR_OPTION",
+     "option '%s': boolean value '%s' was not recognized. Set to OFF."},
+    {"EE_FAILED_TO_SET_OPTION_VALUE",
+     "%s: Error while setting value '%s' to '%s'."},
+    {"EE_INCORRECT_INT_VALUE_FOR_OPTION", "Incorrect integer value: '%s'."},
+    {"EE_INCORRECT_UINT_VALUE_FOR_OPTION",
+     "Incorrect unsigned integer value: '%s'."},
+    {"EE_ADJUSTED_SIGNED_VALUE_FOR_OPTION",
+     "option '%s': signed value %s adjusted to %s."},
+    {"EE_ADJUSTED_UNSIGNED_VALUE_FOR_OPTION",
+     "option '%s': unsigned value %s adjusted to %s."},
+    {"EE_ADJUSTED_ULONGLONG_VALUE_FOR_OPTION",
+     "option '%s': value %s adjusted to %s."},
+    {"EE_ADJUSTED_DOUBLE_VALUE_FOR_OPTION",
+     "option '%s': value %g adjusted to %g."},
+    {"EE_INVALID_DECIMAL_VALUE_FOR_OPTION",
+     "Invalid decimal value for option '%s'."},
+    {"EE_COLLATION_PARSER_ERROR", "%s."},
+    {"EE_FAILED_TO_RESET_BEFORE_PRIMARY_IGNORABLE_CHAR",
+     "Failed to reset before a primary ignorable character %s."},
+    {"EE_FAILED_TO_RESET_BEFORE_TERTIARY_IGNORABLE_CHAR",
+     "Failed to reset before a territory ignorable character %s."},
+    {"EE_SHIFT_CHAR_OUT_OF_RANGE", "Shift character out of range: %s."},
+    {"EE_RESET_CHAR_OUT_OF_RANGE", "Reset character out of range: %s."},
+    {"EE_UNKNOWN_LDML_TAG", "Unknown LDML tag: '%.*s'."},
+    {"EE_FAILED_TO_RESET_BEFORE_SECONDARY_IGNORABLE_CHAR",
+     "Failed to reset before a secondary ignorable character %s."},
+    {"EE_FAILED_PROCESSING_DIRECTIVE",
+     "Stopped processing the '%s' directive in file %s at line %d."},
+    {"EE_PTHREAD_KILL_FAILED",
+     "pthread_kill(thread_id:%lu, signal:%s) returned '%s'."},
+};
 
 /*
  We cannot call my_error/my_printf_error here in this function.
@@ -173,4 +223,10 @@ void wait_for_free_space(const char *filename, int errors) {
   } while (--time_to_sleep > 0 && !is_killed_hook(nullptr));
 }
 
-const char *get_global_errmsg(int nr) { return globerrs[nr - EE_ERROR_FIRST]; }
+const char *get_global_errname(int nr) {
+  return globerrs[nr - EE_ERROR_FIRST].errname;
+}
+
+const char *get_global_errmsg(int nr) {
+  return globerrs[nr - EE_ERROR_FIRST].errdesc;
+}

sql/rpl_replica.cc

@@ -99,6 +99,7 @@
 #include "mysql/thread_type.h"
 #include "mysql_com.h"
 #include "mysqld_error.h"
+#include "mysys_err.h"
 #include "pfs_thread_provider.h"
 #include "prealloced_array.h"
 #include "sql-common/net_ns.h"
@@ -3349,6 +3350,7 @@ static void show_slave_status_metadata(mem_root_deque<Item *> *field_list,
   field_list->push_back(
       new Item_empty_string("Replicate_Wild_Ignore_Table", 28));
   field_list->push_back(new Item_return_int("Last_Errno", 4, MYSQL_TYPE_LONG));
+  field_list->push_back(new Item_empty_string("Last_Symbolic_Errno", 20));
   field_list->push_back(new Item_empty_string("Last_Error", 20));
   field_list->push_back(
       new Item_return_int("Skip_Counter", 10, MYSQL_TYPE_LONG));
@@ -3504,6 +3506,17 @@ static bool show_slave_status_send_data(THD *thd, Master_info *mi,
   protocol->store(&tmp);
 
   protocol->store(mi->rli->last_error().number);
+
+  if (mi->rli->last_error().number == 0) {
+    protocol->store("", &my_charset_bin);
+  } else if (mi->rli->last_error().number >= EE_ERROR_FIRST &&
+             mi->rli->last_error().number <= EE_ERROR_LAST) {
+    protocol->store(get_global_errname(mi->rli->last_error().number),
+                    &my_charset_bin);
+  } else {
+    protocol->store("regular sql errno", &my_charset_bin);
+  }
+
   protocol->store(mi->rli->last_error().message, &my_charset_bin);
   protocol->store((uint32)mi->rli->slave_skip_counter);
   protocol->store((ulonglong)mi->rli->get_group_master_log_pos_info());