BUG#12400221 - 60926: BINARY LOG EVENTS LARGER THAN MAX_ALLOWED_PACKET

Problem
========
            
SQL statements close to the size of max_allowed_packet produce binary
log events larger than max_allowed_packet.
              
The reason why this failure is occuring is because the event length is
more than the total size of the max_allowed_packet + max_event_header
length. Now since the event length exceeds this size master Dump
thread is unable to send the packet on to the slave.
                      
That can happen e.g with row-based replication in Update_rows event.
            
Fix
====
          
The problem was fixed by increasing the max_allowed_packet for the
slave's threads (IO/SQL) by increasing it to 1GB.
This is done using the new server option included which is used to
regulate the max_allowed_packet of the slave thread (IO/SQL).
This causes the large packets to be received by the slave and apply
it successfully.

sql/log_event.h:
  Added the new option in the log_event.h file.
sql/mysqld.cc:
  Added a new option to the server.
sql/slave.cc:
  Increasing the session max_allowed_packet to a large value ,
  i.e. not taking global(max_allowed) into consideration, for the slave's threads.

mysql-test/suite/rpl/r/rpl_log_pos.result

@@ -9,7 +9,7 @@ change master to master_log_pos=MASTER_LOG_POS;
 Read_Master_Log_Pos = '75'
 start slave;
 include/wait_for_slave_io_error.inc [errno=1236]
-Last_IO_Error = 'Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master''
+Last_IO_Error = 'Got fatal error 1236 from master when reading data from binary log: 'binlog truncated in the middle of event''
 include/stop_slave_sql.inc
 show master status;
 File	Position	Binlog_Do_DB	Binlog_Ignore_DB

mysql-test/suite/rpl/r/rpl_packet.result

 include/master-slave.inc
 [connection master]
-call mtr.add_suppression("Slave I/O: Got a packet bigger than 'max_allowed_packet' bytes, Error_code: 1153");
-call mtr.add_suppression("Slave I/O: Got fatal error 1236 from master when reading data from binary log:");
+call mtr.add_suppression("Slave I/O: Got a packet bigger than 'slave_max_allowed_packet' bytes, Error_code: 1153");
+call mtr.add_suppression("Log entry on master is longer than slave_max_allowed_packet");
 drop database if exists DB_NAME_OF_MAX_LENGTH_AKA_NAME_LEN_64_BYTES_____________________;
 create database DB_NAME_OF_MAX_LENGTH_AKA_NAME_LEN_64_BYTES_____________________;
 SET @@global.max_allowed_packet=1024;
@@ -30,14 +30,14 @@ include/start_slave.inc
 CREATE TABLE `t1` (`f1` LONGTEXT) ENGINE=MyISAM;
 INSERT INTO `t1`(`f1`) VALUES ('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa2048');
 include/wait_for_slave_io_error.inc [errno=1153]
-Last_IO_Error = 'Got a packet bigger than 'max_allowed_packet' bytes'
+Last_IO_Error = 'Got a packet bigger than 'slave_max_allowed_packet' bytes'
 include/stop_slave_sql.inc
 include/rpl_reset.inc
 DROP TABLE t1;
 CREATE TABLE t1 (f1 int PRIMARY KEY, f2 LONGTEXT, f3 LONGTEXT) ENGINE=MyISAM;
 INSERT INTO t1(f1, f2, f3) VALUES(1, REPEAT('a', @@global.max_allowed_packet), REPEAT('b', @@global.max_allowed_packet));
-include/wait_for_slave_io_error.inc [errno=1236]
-Last_IO_Error = 'Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master''
+include/wait_for_slave_io_error.inc [errno=1153]
+Last_IO_Error = 'Got a packet bigger than 'slave_max_allowed_packet' bytes'
 STOP SLAVE;
 RESET SLAVE;
 RESET MASTER;
@@ -52,6 +52,7 @@ SET @@global.max_allowed_packet= 1024;
 Warnings:
 Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SET @@global.net_buffer_length= 1024;
+SET @@global.slave_max_allowed_packet= 1073741824;
 DROP TABLE t1;
 RESET SLAVE;
 include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_packet-slave.opt

--O max_allowed_packet=1024 -O net_buffer_length=1024
+-O max_allowed_packet=1024 -O net_buffer_length=1024 -O slave_max_allowed_packet=1024

mysql-test/suite/rpl/t/rpl_packet.test

@@ -11,9 +11,8 @@
 # max-out size db name 
 source include/master-slave.inc;
 source include/have_binlog_format_row.inc;
-call mtr.add_suppression("Slave I/O: Got a packet bigger than 'max_allowed_packet' bytes, Error_code: 1153");
-call mtr.add_suppression("Slave I/O: Got fatal error 1236 from master when reading data from binary log:");
-
+call mtr.add_suppression("Slave I/O: Got a packet bigger than 'slave_max_allowed_packet' bytes, Error_code: 1153");
+call mtr.add_suppression("Log entry on master is longer than slave_max_allowed_packet");
 let $db= DB_NAME_OF_MAX_LENGTH_AKA_NAME_LEN_64_BYTES_____________________;
 disable_warnings;
 eval drop database if exists $db;
@@ -23,6 +22,7 @@ eval create database $db;
 connection master;
 let $old_max_allowed_packet= `SELECT @@global.max_allowed_packet`;
 let $old_net_buffer_length= `SELECT @@global.net_buffer_length`;
+let $old_slave_max_allowed_packet= `SELECT @@global.slave_max_allowed_packet`;
 SET @@global.max_allowed_packet=1024;
 SET @@global.net_buffer_length=1024;
 
@@ -124,8 +124,8 @@ INSERT INTO t1(f1, f2, f3) VALUES(1, REPEAT('a', @@global.max_allowed_packet), R
 
 connection slave;
 # The slave I/O thread must stop after receiving
-# 1236=ER_MASTER_FATAL_ERROR_READING_BINLOG error message from master.
---let $slave_io_errno= 1236
+# 1153 = ER_NET_PACKET_TOO_LARGE
+--let $slave_io_errno= 1153
 --let $show_slave_io_error= 1
 --source include/wait_for_slave_io_error.inc
 
@@ -166,6 +166,7 @@ connection master;
 DROP TABLE t1;
 eval SET @@global.max_allowed_packet= $old_max_allowed_packet;
 eval SET @@global.net_buffer_length= $old_net_buffer_length;
+eval SET @@global.slave_max_allowed_packet= $old_slave_max_allowed_packet;
 # slave is stopped
 connection slave;
 DROP TABLE t1;

mysql-test/suite/sys_vars/inc/slave_max_allowed_packet_basic.inc

+############## mysql-test\t\slave_max_allowed_packet_basic.test ##################
+#                                                                             #
+# Variable Name: slave_max_allowed_packet                                     #
+# Scope: GLOBAL                                                               #
+# Access Type: Dynamic                                                        #
+# Data Type: numeric                                                          #
+# Default Value:1073741824                                                    #
+# Range: 1024 - 1073741824                                                    #
+#                                                                             #
+#                                                                             #
+#                                                                             #
+# Description: Test Cases of Dynamic System Variable slave_max_allowed_packet #
+#              that checks the behavior of this variable in the following ways#
+#              * Default Value                                                #
+#              * Valid & Invalid values                                       #
+#              * Scope & Access method                                        #
+#              * Data Integrity                                               #
+#                                                                             #
+###############################################################################
+
+--source include/load_sysvars.inc
+
+######################################################################## 
+#              START OF slave_max_allowed_packet TESTS                 #
+######################################################################## 
+
+
+########################################################################### 
+# Saving initial value of slave_max_allowed_packet in a temporary variable#
+########################################################################### 
+
+SET @start_value = @@global.slave_max_allowed_packet;
+SELECT @start_value;
+
+
+--echo '#--------------------FN_DYNVARS_072_01------------------------#'
+######################################################################## 
+#           Display the DEFAULT value of slave_max_allowed_packet      #
+######################################################################## 
+
+SET @@global.slave_max_allowed_packet = 5000;
+SET @@global.slave_max_allowed_packet = DEFAULT;
+SELECT @@global.slave_max_allowed_packet;
+
+
+--echo '#---------------------FN_DYNVARS_072_02-------------------------#'
+############################################### 
+#     Verify default value of variable        #
+############################################### 
+
+SET @@global.slave_max_allowed_packet = @start_value;
+SELECT @@global.slave_max_allowed_packet = 1073741824; 
+--echo 'Bug# 34876: Incorrect Default Value is assigned to variable';
+
+--echo '#--------------------FN_DYNVARS_072_03------------------------#'
+######################################################################## 
+#    Change the value of slave_max_allowed_packet to a valid value     #
+######################################################################## 
+
+SET @@global.slave_max_allowed_packet = 1024;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 1073741824;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 1073741824;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 1025;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 65535;
+SELECT @@global.slave_max_allowed_packet;
+--echo 'Bug# 34877: Invalid Values are coming in variable on assigning valid values';
+
+
+--echo '#--------------------FN_DYNVARS_072_04-------------------------#'
+########################################################################### 
+#      Change the value of slave_max_allowed_packet to invalid value         #
+########################################################################### 
+
+SET @@global.slave_max_allowed_packet = -1;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 100000000000;
+SELECT @@global.slave_max_allowed_packet;
+--Error ER_WRONG_TYPE_FOR_VAR
+SET @@global.slave_max_allowed_packet = 10000.01;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = -1024;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 4294967296;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = 1023;
+SELECT @@global.slave_max_allowed_packet;
+
+--echo 'Bug # 34837: Errors are not coming on assigning invalid values to variable';
+
+--Error ER_WRONG_TYPE_FOR_VAR
+SET @@global.slave_max_allowed_packet = ON;
+SELECT @@global.slave_max_allowed_packet;
+--Error ER_WRONG_TYPE_FOR_VAR
+SET @@global.slave_max_allowed_packet = 'test';
+SELECT @@global.slave_max_allowed_packet;
+
+
+--echo '#-------------------FN_DYNVARS_072_05----------------------------#'
+########################################################################### 
+#       Test if accessing session slave_max_allowed_packet gives error       #
+########################################################################### 
+
+--Error ER_GLOBAL_VARIABLE
+SET @@session.slave_max_allowed_packet = 4096;
+--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SELECT @@session.slave_max_allowed_packet;
+
+
+--echo '#----------------------FN_DYNVARS_072_06------------------------#'
+############################################################################## 
+# Check if the value in GLOBAL & SESSION Tables matches values in variable   #
+##############################################################################
+
+SELECT @@global.slave_max_allowed_packet = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES 
+WHERE VARIABLE_NAME='slave_max_allowed_packet';
+
+SELECT @@slave_max_allowed_packet = VARIABLE_VALUE 
+FROM INFORMATION_SCHEMA.SESSION_VARIABLES 
+WHERE VARIABLE_NAME='slave_max_allowed_packet';
+
+
+--echo '#---------------------FN_DYNVARS_072_07----------------------#'
+################################################################### 
+#      Check if TRUE and FALSE values can be used on variable     #
+################################################################### 
+
+SET @@global.slave_max_allowed_packet = TRUE;
+SELECT @@global.slave_max_allowed_packet;
+SET @@global.slave_max_allowed_packet = FALSE;
+SELECT @@global.slave_max_allowed_packet;
+
+
+--echo '#---------------------FN_DYNVARS_072_08----------------------#'
+########################################################################################################
+#    Check if accessing variable with SESSION,LOCAL and without SCOPE points to same session variable  #
+########################################################################################################
+
+SET @@global.slave_max_allowed_packet = 5000;
+SELECT @@slave_max_allowed_packet = @@global.slave_max_allowed_packet;
+
+
+--echo '#---------------------FN_DYNVARS_072_09----------------------#'
+################################################################################  
+#   Check if slave_max_allowed_packet can be accessed with and without @@ sign #
+################################################################################
+
+--Error ER_GLOBAL_VARIABLE
+SET slave_max_allowed_packet = 6000;
+SELECT @@slave_max_allowed_packet;
+--Error ER_PARSE_ERROR
+SET local.slave_max_allowed_packet = 7000;
+--Error ER_UNKNOWN_TABLE
+SELECT local.slave_max_allowed_packet;
+--Error ER_PARSE_ERROR
+SET global.slave_max_allowed_packet = 8000;
+--Error ER_UNKNOWN_TABLE
+SELECT global.slave_max_allowed_packet;
+--Error ER_BAD_FIELD_ERROR
+SELECT slave_max_allowed_packet = @@session.slave_max_allowed_packet;
+
+
+##############################  
+#   Restore initial value    #
+##############################
+
+SET @@global.slave_max_allowed_packet = @start_value;
+SELECT @@global.slave_max_allowed_packet;
+
+
+######################################################################## 
+#              END OF slave_max_allowed_packet TESTS                   #
+######################################################################## 

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

@@ -7,6 +7,7 @@ SET @@global.max_allowed_packet = DEFAULT;
 SET @@global.max_allowed_packet = 1000;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '1000'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SET @@global.max_allowed_packet = DEFAULT;
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
@@ -25,10 +26,14 @@ SELECT @@global.max_allowed_packet = 1048576;
 1
 '#--------------------FN_DYNVARS_070_03-------------------------#'
 SET @@global.max_allowed_packet = 1024;
+Warnings:
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
 SET @@global.max_allowed_packet = 1025;
+Warnings:
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
@@ -71,18 +76,21 @@ SELECT @@session.max_allowed_packet;
 SET @@global.max_allowed_packet = 0;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '0'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
 SET @@global.max_allowed_packet = -1024;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '-1024'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
 SET @@global.max_allowed_packet = 1023;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '1023'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
@@ -146,17 +154,21 @@ WHERE VARIABLE_NAME='max_allowed_packet';
 SET @@global.max_allowed_packet = TRUE;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '1'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
 SET @@global.max_allowed_packet = FALSE;
 Warnings:
 Warning	1292	Truncated incorrect max_allowed_packet value: '0'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet
 1024
 '#---------------------FN_DYNVARS_070_09----------------------#'
 SET @@global.max_allowed_packet = 2048;
+Warnings:
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@max_allowed_packet = @@global.max_allowed_packet;
 @@max_allowed_packet = @@global.max_allowed_packet
 0

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

@@ -23,6 +23,8 @@ SELECT @@session.net_buffer_length;
 '#--------------------FN_DYNVARS_070_02-------------------------#'
 ## Setting value of max_allowed packet and net_buffer_length to 1024 ##
 SET @@global.max_allowed_packet = 1024;
+Warnings:
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SET @@global.net_buffer_length = 1024;
 SELECT @@global.max_allowed_packet;
 @@global.max_allowed_packet

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

@@ -63,12 +63,14 @@ SELECT @@global.net_buffer_length;
 SET @@global.net_buffer_length = 1048577;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '1048577'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.net_buffer_length;
 @@global.net_buffer_length
 1048576
 SET @@global.net_buffer_length = 104857633;
 Warnings:
 Warning	1292	Truncated incorrect net_buffer_length value: '104857633'
+Warning	1105	The value of 'max_allowed_packet' should be no less than the value of 'net_buffer_length'
 SELECT @@global.net_buffer_length;
 @@global.net_buffer_length
 1048576

mysql-test/suite/sys_vars/t/slave_max_allowed_packet_basic.test

+--source suite/sys_vars/inc/slave_max_allowed_packet_basic.inc
+
+

sql/log_event.cc

@@ -1122,7 +1122,7 @@ failed my_b_read"));
   Log_event *res=  0;
 #ifndef max_allowed_packet
   THD *thd=current_thd;
-  uint max_allowed_packet= thd ? thd->variables.max_allowed_packet : ~(ulong)0;
+  uint max_allowed_packet= thd ? slave_max_allowed_packet:~(ulong)0;
 #endif
 
   if (data_len > max_allowed_packet)

sql/log_event.h

@@ -275,6 +275,13 @@ struct sql_ex_info
   MAX_SIZE_LOG_EVENT_STATUS + /* status */ \
   NAME_LEN + 1)
 
+/*
+  The new option is added to handle large packets that are sent from the master 
+  to the slave. It is used to increase the thd(max_allowed) for both the
+  DUMP thread on the master and the SQL/IO thread on the slave. 
+*/
+#define MAX_MAX_ALLOWED_PACKET 1024*1024*1024
+
 /* 
    Event header offsets; 
    these point to places inside the fixed header.

sql/mysql_priv.h

@@ -1944,6 +1944,7 @@ extern ulong slave_net_timeout, slave_trans_retries;
 extern uint max_user_connections;
 extern ulong what_to_log,flush_time;
 extern ulong query_buff_size;
+extern ulong slave_max_allowed_packet;
 extern ulong max_prepared_stmt_count, prepared_stmt_count;
 extern ulong binlog_cache_size, open_files_limit;
 extern ulonglong max_binlog_cache_size;

sql/mysqld.cc

@@ -28,6 +28,7 @@
 #include "mysys_err.h"
 #include "events.h"
 #include "debug_sync.h"
+#include "log_event.h"
 
 #include "../storage/myisam/ha_myisam.h"
 
@@ -574,6 +575,7 @@ static const char *slave_exec_mode_str= "STRICT";
 ulong thread_cache_size=0, thread_pool_size= 0;
 ulong binlog_cache_size=0;
 ulonglong  max_binlog_cache_size=0;
+ulong slave_max_allowed_packet= 0;
 ulong query_cache_size=0;
 ulong refresh_version;  /* Increments on each reload */
 query_id_t global_query_id;
@@ -5572,6 +5574,7 @@ enum options_mysqld
   OPT_KEY_CACHE_DIVISION_LIMIT, OPT_KEY_CACHE_AGE_THRESHOLD,
   OPT_LONG_QUERY_TIME,
   OPT_LOWER_CASE_TABLE_NAMES, OPT_MAX_ALLOWED_PACKET,
+  OPT_SLAVE_MAX_ALLOWED_PACKET,
   OPT_MAX_BINLOG_CACHE_SIZE, OPT_MAX_BINLOG_SIZE,
   OPT_MAX_CONNECTIONS, OPT_MAX_CONNECT_ERRORS,
   OPT_MAX_DELAYED_THREADS, OPT_MAX_HEP_TABLE_SIZE,
@@ -6700,6 +6703,10 @@ thread is in the relay logs.",
    &global_system_variables.max_allowed_packet,
    &max_system_variables.max_allowed_packet, 0, GET_ULONG,
    REQUIRED_ARG, 1024*1024L, 1024, 1024L*1024L*1024L, MALLOC_OVERHEAD, 1024, 0},
+  {"slave_max_allowed_packet", OPT_SLAVE_MAX_ALLOWED_PACKET,
+   "The maximum packet length to sent successfully from the master to slave.",
+   &slave_max_allowed_packet, &slave_max_allowed_packet, 0, GET_ULONG,
+   REQUIRED_ARG, MAX_MAX_ALLOWED_PACKET, 1024, MAX_MAX_ALLOWED_PACKET, MALLOC_OVERHEAD, 1024, 0},
   {"max_binlog_cache_size", OPT_MAX_BINLOG_CACHE_SIZE,
    "Can be used to restrict the total size used to cache a multi-transaction query.",
    &max_binlog_cache_size, &max_binlog_cache_size, 0,

sql/set_var.cc

@@ -366,6 +366,8 @@ static sys_var_const    sys_lower_case_table_names(&vars,
 static sys_var_thd_ulong_session_readonly sys_max_allowed_packet(&vars, "max_allowed_packet",
 					       &SV::max_allowed_packet,
                                                check_max_allowed_packet);
+static sys_var_long_ptr sys_slave_max_allowed_packet(&vars, "slave_max_allowed_packet",
+                                              &slave_max_allowed_packet); 
 static sys_var_ulonglong_ptr sys_max_binlog_cache_size(&vars, "max_binlog_cache_size",
                                                        &max_binlog_cache_size);
 static sys_var_long_ptr	sys_max_binlog_size(&vars, "max_binlog_size",

sql/share/errmsg.txt

@@ -3512,23 +3512,23 @@ ER_ABORTING_CONNECTION 08S01
         swe "Avbrt lnken fr trd %ld till db '%-.192s', anvndare '%-.48s' (%-.64s)"
         ukr " ' %ld   : '%-.192s' : '%-.48s' (%-.64s)"
 ER_NET_PACKET_TOO_LARGE 08S01 
-        cze "Zji-Btn pchoz packet del ne 'max_allowed_packet'"
-        dan "Modtog en datapakke som var strre end 'max_allowed_packet'"
-        nla "Groter pakket ontvangen dan 'max_allowed_packet'"
-        eng "Got a packet bigger than 'max_allowed_packet' bytes"
-        est "Saabus suurem pakett kui lubatud 'max_allowed_packet' muutujaga"
-        fre "Paquet plus grand que 'max_allowed_packet' reu"
-        ger "Empfangenes Paket ist grer als 'max_allowed_packet' Bytes"
-        hun "A kapott csomag nagyobb, mint a maximalisan engedelyezett: 'max_allowed_packet'"
-        ita "Ricevuto un pacchetto piu` grande di 'max_allowed_packet'"
-        kor "'max_allowed_packet' ū Ŷ ޾ҽϴ."
-        por "Obteve um pacote maior do que a taxa mxima de pacotes definida (max_allowed_packet)"
-        rum "Un packet mai mare decit 'max_allowed_packet' a fost primit"
-        rus "  ,  'max_allowed_packet'"
-        serbian "Primio sam mreni paket vei od definisane vrednosti 'max_allowed_packet'"
-        spa "Obtenido un paquete mayor que 'max_allowed_packet'"
-        swe "Kommunkationspaketet r strre n 'max_allowed_packet'"
-        ukr "  ¦ Φ max_allowed_packet"
+        cze "Zji-Btn pchoz packet del ne 'slave_max_allowed_packet'"
+        dan "Modtog en datapakke som var strre end 'slave_max_allowed_packet'"
+        nla "Groter pakket ontvangen dan 'slave_max_allowed_packet'"
+        eng "Got a packet bigger than 'slave_max_allowed_packet' bytes"
+        est "Saabus suurem pakett kui lubatud 'slave_max_allowed_packet' muutujaga"
+        fre "Paquet plus grand que 'slave_max_allowed_packet' reu"
+        ger "Empfangenes Paket ist grer als 'slave_max_allowed_packet' Bytes"
+        hun "A kapott csomag nagyobb, mint a maximalisan engedelyezett: 'slave_max_allowed_packet'"
+        ita "Ricevuto un pacchetto piu` grande di 'slave_max_allowed_packet'"
+        kor "'slave_max_allowed_packet' ū Ŷ ޾ҽϴ."
+        por "Obteve um pacote maior do que a taxa mxima de pacotes definida (slave_max_allowed_packet)"
+        rum "Un packet mai mare decit 'slave_max_allowed_packet' a fost primit"
+        rus "  ,  'slave_max_allowed_packet'"
+        serbian "Primio sam mreni paket vei od definisane vrednosti 'slave_max_allowed_packet'"
+        spa "Obtenido un paquete mayor que 'slave_max_allowed_packet'"
+        swe "Kommunkationspaketet r strre n 'slave_max_allowed_packet'"
+        ukr "  ¦ Φ slave_max_allowed_packet"
 ER_NET_READ_ERROR_FROM_PIPE 08S01 
         cze "Zji-Btna chyba pi ten z roury spojen"
         dan "Fik lsefejl fra forbindelse (connection pipe)"

sql/slave.cc

@@ -1884,8 +1884,8 @@ static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type)
   slave threads, since a replication event can become this much larger
   than the corresponding packet (query) sent from client to master.
 */
-  thd->variables.max_allowed_packet= global_system_variables.max_allowed_packet
-    + MAX_LOG_EVENT_HEADER;  /* note, incr over the global not session var */
+  thd->variables.max_allowed_packet= slave_max_allowed_packet;
+  thd->net.max_packet_size= slave_max_allowed_packet;
   thd->slave_thread = 1;
   thd->enable_slow_log= opt_log_slow_slave_statements;
   set_slave_thread_options(thd);
@@ -2630,6 +2630,7 @@ pthread_handler_t handle_slave_io(void *arg)
     thread, since a replication event can become this much larger than
     the corresponding packet (query) sent from client to master.
   */
+    thd->net.max_packet_size= slave_max_allowed_packet;
     mysql->net.max_packet_size= thd->net.max_packet_size+= MAX_LOG_EVENT_HEADER;
   }
   else
@@ -2761,10 +2762,10 @@ reading event"))
         switch (mysql_error_number) {
         case CR_NET_PACKET_TOO_LARGE:
           sql_print_error("\
-Log entry on master is longer than max_allowed_packet (%ld) on \
+Log entry on master is longer than slave_max_allowed_packet (%lu) on \
 slave. If the entry is correct, restart the server with a higher value of \
-max_allowed_packet",
-                          thd->variables.max_allowed_packet);
+slave_max_allowed_packet",
+                         slave_max_allowed_packet);
           mi->report(ERROR_LEVEL, ER_NET_PACKET_TOO_LARGE,
                      "%s", ER(ER_NET_PACKET_TOO_LARGE));
           goto err;

sql/sql_repl.cc

@@ -469,7 +469,7 @@ impossible position";
     this larger than the corresponding packet (query) sent 
     from client to master.
   */
-  thd->variables.max_allowed_packet+= MAX_LOG_EVENT_HEADER;
+  thd->variables.max_allowed_packet= ULONG_MAX;
 
   /*
     We can set log_lock now, it does not move (it's a member of