Bug#18436 (RBR: Replication to partition engine triggers assertion on slave side):

Partial fix for resolving the problem. Swapping contents of record[0]
and record[1] since this is what some storage engines expect.


sql/handler.cc:
  Adding assertion to get early failure.
sql/log_event.cc:
  Correcting code so that new record is passed in record[0] and
  old record is passed in record[1] when calling update_row().
mysql-test/r/rpl_row_basic_8partition.result:
  New BitKeeper file ``mysql-test/r/rpl_row_basic_8partition.result''
mysql-test/t/rpl_row_basic_8partition.test:
  New BitKeeper file ``mysql-test/t/rpl_row_basic_8partition.test''

mysql-test/t/rpl_row_basic_8partition.test

+############################################################
+# Author: MATZ                                             #
+# Date: 2006-03-22                                         #
+# Purpose: See if replication of partition tables work     #
+# Most of this test is copied from the rpl_xxx2yyy tests,  #
+# but here we just test some simple basic replication of   #
+# partition tables with same engine (MyISAM) in both ends. #
+############################################################
+
+--source include/master-slave.inc
+connection master;
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+SET BINLOG_FORMAT=ROW;
+
+--echo **** Partition RANGE testing ****
+
+# Create table that is partitioned by range on year i.e. year(t) and
+# replicate basice operations such at insert, update delete between 2
+# different storage engines Alter table and ensure table is handled
+# Correctly on the slave
+# Note that the storage engine should not be explicit: the default
+# storage engine is used on master and slave.
+
+CREATE TABLE t1 (id MEDIUMINT NOT NULL, b1 BIT(8), vc VARCHAR(255), 
+                 bc CHAR(255), d DECIMAL(10,4) DEFAULT 0, 
+                 f FLOAT DEFAULT 0, total BIGINT UNSIGNED, 
+                 y YEAR, t DATE)
+                 PARTITION BY RANGE (YEAR(t)) 
+                (PARTITION p0 VALUES LESS THAN (1901), 
+                 PARTITION p1 VALUES LESS THAN (1946),  
+                 PARTITION p2 VALUES LESS THAN (1966), 
+                 PARTITION p3 VALUES LESS THAN (1986), 
+                 PARTITION p4 VALUES LESS THAN (2005), 
+                 PARTITION p5 VALUES LESS THAN MAXVALUE);
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave --
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+connection master;
+# Check that simple Alter statements are replicated correctly
+ALTER TABLE t1 MODIFY vc TEXT;
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+# Perform basic operation on master and ensure replicated correctly
+--source include/rpl_multi_engine3.inc
+
+connection master;
+DROP TABLE IF EXISTS t1;
+
+########################################################
+
+--echo **** Partition LIST testing ****
+
+# Create table that is partitioned by list on id i.e. (2,4). Pretend
+# that we missed one and alter to add. Then replicate basice
+# operations such at insert, update delete between 2 different storage
+# engines Alter table and ensure table is handled Correctly on the
+# slave.
+
+
+CREATE TABLE t1 (id MEDIUMINT NOT NULL, b1 BIT(8), vc VARCHAR(255), 
+                 bc CHAR(255), d DECIMAL(10,4) DEFAULT 0, 
+                 f FLOAT DEFAULT 0, total BIGINT UNSIGNED, 
+                 y YEAR, t DATE)
+                 PARTITION BY LIST(id) 
+                (PARTITION p0 VALUES IN (2, 4), 
+                 PARTITION p1 VALUES IN (42, 142),
+                 PARTITION p2 VALUES IN (412));
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+# Perform basic operation on master and ensure replicated correctly
+--source include/rpl_multi_engine3.inc
+
+connection master;
+# Check that simple Alter statements are replicated correctly ---
+ALTER TABLE t1 MODIFY vc TEXT;
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+# Perform basic operation on master and ensure replicated correctly
+--source include/rpl_multi_engine3.inc
+
+connection master;
+DROP TABLE IF EXISTS t1;
+
+########################################################
+
+--echo **** Partition HASH testing ****
+
+# Create table that is partitioned by hash on year i.e. YEAR(t). Then
+# replicate basice operations such at insert, update delete between 2
+# different storage engines Alter table and ensure table is handled
+# Correctly on the slave
+
+CREATE TABLE t1 (id MEDIUMINT NOT NULL, b1 BIT(8), vc VARCHAR(255), 
+                 bc CHAR(255), d DECIMAL(10,4) DEFAULT 0, 
+                 f FLOAT DEFAULT 0, total BIGINT UNSIGNED, 
+                 y YEAR, t DATE)
+                 PARTITION BY HASH( YEAR(t) ) 
+                 PARTITIONS 4; 
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+# Check that simple Alter statements are replicated correctly
+ALTER TABLE t1 MODIFY vc TEXT;
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+connection master;
+DROP TABLE IF EXISTS t1;
+
+########################################################
+
+# This part does not work
+--disable_parsing
+--echo **** Partition by KEY ****
+
+# Create table that is partitioned by key on id with 4 parts.  Then
+# replicate basice operations such at insert, update delete between 2
+# different storage engines Alter table and ensure table is handled
+# Correctly on the slave
+
+CREATE TABLE t1 (id MEDIUMINT NOT NULL, b1 BIT(8), vc VARCHAR(255), 
+                 bc CHAR(255), d DECIMAL(10,4) DEFAULT 0, 
+                 f FLOAT DEFAULT 0, total BIGINT UNSIGNED, 
+                 y YEAR, t DATE,PRIMARY KEY(id))
+                 PARTITION BY KEY() 
+                 PARTITIONS 4;
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+connection master;
+# Check that simple Alter statements are replicated correctly
+ALTER TABLE t1 DROP PRIMARY KEY, ADD PRIMARY KEY(id, total);
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+connection master;
+# Check that simple Alter statements are replicated correctly
+ALTER TABLE t1 MODIFY vc TEXT;
+
+--echo --- On master ---
+SHOW CREATE TABLE t1;
+
+--echo --- On slave ---
+sync_slave_with_master;
+SHOW CREATE TABLE t1;
+
+--source include/rpl_multi_engine3.inc
+
+DROP TABLE IF EXISTS t1;
+--enable_parsing
+
+# End of 5.1 test case

sql/handler.cc

@@ -3296,6 +3296,13 @@ int handler::ha_write_row(byte *buf)
 int handler::ha_update_row(const byte *old_data, byte *new_data)
 {
   int error;
+
+  /*
+    Some storage engines require that the new record is in record[0]
+    (and the old record is in record[1]).
+   */
+  DBUG_ASSERT(new_data == table->record[0]);
+
   if (unlikely(error= update_row(old_data, new_data)))
     return error;
 #ifdef HAVE_ROW_BASED_REPLICATION

sql/log_event.cc

@@ -6402,7 +6402,7 @@ static int find_and_fetch_row(TABLE *table, byte *key)
       table->record[0] if the engine allows it.  We first compute a
       row reference using the position() member function (it will be
       stored in table->file->ref) and the use rnd_pos() to position
-      the "cursor" at the correct row.
+      the "cursor" (i.e., record[0] in this case) at the correct row.
     */
     table->file->position(table->record[0]);
     DBUG_RETURN(table->file->rnd_pos(table->record[0], table->file->ref));
@@ -6797,19 +6797,25 @@ int Update_rows_log_event::do_exec_row(TABLE *table)
     return error;
 
   /*
-    This is only a precaution to make sure that the call to
-    ha_update_row is using record[1].
-
-    If this is not needed/required, then we could use m_after_image in
-    that call instead.
+    We have to ensure that the new record (i.e., the after image) is
+    in record[0] and the old record (i.e., the before image) is in
+    record[1].  This since some storage engines require this (for
+    example, the partition engine).
+
+    Since find_and_fetch_row() puts the fetched record (i.e., the old
+    record) in record[0], we have to move it out of the way and into
+    record[1]. After that, we can put the new record (i.e., the after
+    image) into record[0].
   */
-  bmove_align(table->record[1], m_after_image,(size_t) table->s->reclength);
+  bmove_align(table->record[1], table->record[0], table->s->reclength);
+  bmove_align(table->record[0], m_after_image, table->s->reclength);
 
   /*
-    Now we should have the right row to update.  The record that has
-    been fetched is guaranteed to be in record[0], so we use that.
+    Now we should have the right row to update.  The old row (the one
+    we're looking for) has to be in record[1] and the new row has to
+    be in record[0] for all storage engines to work correctly.
   */
-  error= table->file->ha_update_row(table->record[0], table->record[1]);
+  error= table->file->ha_update_row(table->record[1], table->record[0]);
 
   return error;
 }