[Commits] Rev 2902: Merge Percona patch row_based_replication_without_primary_key.patch into MariaDB. in http://bazaar.launchpad.net/~maria-captains/maria/5.2

knielsen at knielsen-hq.org knielsen at knielsen-hq.org
Mon Jan 10 13:46:00 EET 2011


At http://bazaar.launchpad.net/~maria-captains/maria/5.2

------------------------------------------------------------
revno: 2902
revision-id: knielsen at knielsen-hq.org-20101227213737-69axme9nj22hgylw
parent: sergii at pisem.net-20101220181924-36y30fgi1soarmdo
committer: knielsen at knielsen-hq.org
branch nick: work-5.2-percona-patches
timestamp: Mon 2010-12-27 22:37:37 +0100
message:
  Merge Percona patch row_based_replication_without_primary_key.patch into MariaDB.
  
  This patch improves the selection of index to use to apply row-based
  DELETE and UPDATE events on tables with no primary key (original code
  picks the first index unconditionally).
  If ANALYZE TABLE is done, the index cardinalities will be compared and
  the best index will be used.
  
  Fixes some problems in the original patch:
  
   - Without ANALYZE TABLE, rec_per_key statistics is not available; in this
     case the original patch could choose a really bad index, even ignoring
     a primary key.
  
   - The original patch did not consider multi-column keys correctly, and
     could thus pick a less desirable single-column key over a good
     multi-column index.
  
  Also fixes Bug#58997, and adds test cases.
=== added file 'mysql-test/suite/rpl/r/rpl_row_index_choice.result'
--- a/mysql-test/suite/rpl/r/rpl_row_index_choice.result	1970-01-01 00:00:00 +0000
+++ b/mysql-test/suite/rpl/r/rpl_row_index_choice.result	2010-12-27 21:37:37 +0000
@@ -0,0 +1,143 @@
+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+CREATE TABLE t1 (a int, b varchar(100), fulltext(b)) engine=MyISAM;
+INSERT INTO t1 VALUES (1,"a"), (2,"b");
+UPDATE t1 SET b='A' WHERE a=1;
+DELETE FROM t1 WHERE a=2;
+SELECT * FROM t1 ORDER BY a;
+a       b
+1       A
+DROP TABLE t1;
+CREATE TABLE t1 (d INT PRIMARY KEY) ENGINE=myisam;
+INSERT INTO t1 VALUES (0);
+INSERT INTO t1 SELECT d+1 FROM t1;
+INSERT INTO t1 SELECT d+2 FROM t1;
+INSERT INTO t1 SELECT d+4 FROM t1;
+INSERT INTO t1 SELECT d+8 FROM t1;
+INSERT INTO t1 SELECT d+16 FROM t1;
+INSERT INTO t1 SELECT d+32 FROM t1;
+INSERT INTO t1 SELECT d+64 FROM t1;
+INSERT INTO t1 SELECT d+128 FROM t1;
+INSERT INTO t1 SELECT d+256 FROM t1;
+INSERT INTO t1 SELECT d+512 FROM t1;
+CREATE TABLE t2 (a INT, b INT, c INT, d INT,
+KEY wrong_key(a),
+KEY expected_key(b,c),
+KEY wrong_key2(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+ANALYZE TABLE t2;
+Table   Op      Msg_type        Msg_text
+test.t2 analyze status  OK
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d
+4       1       5       10042
+DROP TABLE t2;
+CREATE TABLE t2 (a INT, b INT, c INT, d INT NOT NULL, e INT,
+UNIQUE wrong_key3(a,e),
+KEY wrong_key4(b,c),
+UNIQUE expected_key(d)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, NULL FROM t1;
+ANALYZE TABLE t2;
+Table   Op      Msg_type        Msg_text
+test.t2 analyze status  OK
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d       e
+4       1       5       10042   NULL
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT NOT NULL,
+KEY wrong_key5(b),
+UNIQUE expected_key(d),
+KEY wrong_key6(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d
+4       1       5       10042
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT NOT NULL,
+KEY expected_key(b),
+KEY wrong_key7(d),
+KEY wrong_key8(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d
+4       1       5       10042
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT,
+UNIQUE wrong_key9(d),
+KEY wrong_key10(a),
+PRIMARY KEY expected_key(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan,slave_crash_if_index_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d
+4       1       5       10042
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT, e INT,
+UNIQUE wrong_key11(e),
+KEY wrong_key12(a),
+KEY expected_key(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, IF(d<10, d, NULL) FROM t1;
+ANALYZE TABLE t2;
+Table   Op      Msg_type        Msg_text
+test.t2 analyze status  OK
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d       e
+4       1       5       10042   NULL
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT, e INT,
+KEY wrong_key13(a),
+UNIQUE expected_key(e),
+KEY wrong_key14(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, IF(d<10, d, NULL) FROM t1;
+# Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       b       c       d       e
+4       1       5       10042   NULL
+DROP TABLE t2;
+CREATE TABLE t2 (a INT NOT NULL, d INT) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d FROM t1;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+SELECT * FROM t2 WHERE d IN (10042,53);
+a       d
+4       10042
+DROP TABLE t2;
+DROP TABLE t1;
+SET GLOBAL debug="";

=== added file 'mysql-test/suite/rpl/t/rpl_row_index_choice.test'
--- a/mysql-test/suite/rpl/t/rpl_row_index_choice.test	1970-01-01 00:00:00 +0000
+++ b/mysql-test/suite/rpl/t/rpl_row_index_choice.test	2010-12-27 21:37:37 +0000
@@ -0,0 +1,241 @@
+--source include/have_binlog_format_row.inc
+--source include/master-slave.inc
+--source include/have_debug.inc
+--source include/have_innodb.inc
+
+# Bug#58997: Row-based replication breaks on table with only fulltext index: 
+connection master;
+CREATE TABLE t1 (a int, b varchar(100), fulltext(b)) engine=MyISAM;
+INSERT INTO t1 VALUES (1,"a"), (2,"b");
+UPDATE t1 SET b='A' WHERE a=1;
+DELETE FROM t1 WHERE a=2;
+
+sync_slave_with_master;
+
+connection slave;
+
+SELECT * FROM t1 ORDER BY a;
+
+connection master;
+DROP TABLE t1;
+
+
+# A utility table used to populate subsequent tables in various ways.
+connection master;
+CREATE TABLE t1 (d INT PRIMARY KEY) ENGINE=myisam;
+INSERT INTO t1 VALUES (0);
+INSERT INTO t1 SELECT d+1 FROM t1;
+INSERT INTO t1 SELECT d+2 FROM t1;
+INSERT INTO t1 SELECT d+4 FROM t1;
+INSERT INTO t1 SELECT d+8 FROM t1;
+INSERT INTO t1 SELECT d+16 FROM t1;
+INSERT INTO t1 SELECT d+32 FROM t1;
+INSERT INTO t1 SELECT d+64 FROM t1;
+INSERT INTO t1 SELECT d+128 FROM t1;
+INSERT INTO t1 SELECT d+256 FROM t1;
+INSERT INTO t1 SELECT d+512 FROM t1;
+
+# Test that we pick the better multi-column index, even if the
+# single-column index is more selective in the first column.
+CREATE TABLE t2 (a INT, b INT, c INT, d INT,
+                 KEY wrong_key(a),
+                 KEY expected_key(b,c),
+                 KEY wrong_key2(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+
+sync_slave_with_master;
+connection slave;
+ANALYZE TABLE t2;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+# Test that we don't pick a unique index with NULLS over a more selective
+# non-unique index.
+connection master;
+DROP TABLE t2;
+CREATE TABLE t2 (a INT, b INT, c INT, d INT NOT NULL, e INT,
+                 UNIQUE wrong_key3(a,e),
+                 KEY wrong_key4(b,c),
+                 UNIQUE expected_key(d)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, NULL FROM t1;
+
+sync_slave_with_master;
+connection slave;
+ANALYZE TABLE t2;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+# Test that we pick a reasonable index when there is no rec_per_key[]
+# information (no ANALYZE TABLE).
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT NOT NULL,
+                 KEY wrong_key5(b),
+                 UNIQUE expected_key(d),
+                 KEY wrong_key6(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+
+sync_slave_with_master;
+connection slave;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+# Also test without ANALYZE when we pick the sub-optimal index.
+# In this case the key on (d) is the best one, but without ANALYZE TABLE we
+# have no information and will pick the first one on (b).
+# (This test should be updated if we improve the index selection, of course).
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT NOT NULL,
+                 KEY expected_key(b),
+                 KEY wrong_key7(d),
+                 KEY wrong_key8(c)) ENGINE=myisam;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+
+sync_slave_with_master;
+connection slave;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+# Test that we pick the primary key for InnoDB, if available.
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT,
+                 UNIQUE wrong_key9(d),
+                 KEY wrong_key10(a),
+                 PRIMARY KEY expected_key(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d FROM t1;
+
+sync_slave_with_master;
+connection slave;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan,slave_crash_if_index_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+# Test that we pick a good index for InnoDB when primary key is not available.
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT, e INT,
+                 UNIQUE wrong_key11(e),
+                 KEY wrong_key12(a),
+                 KEY expected_key(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, IF(d<10, d, NULL) FROM t1;
+
+sync_slave_with_master;
+connection slave;
+ANALYZE TABLE t2;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+# When there is no ANALYZE TABLE, InnoDB will just report "1" for index
+# cardinality for all indexes in rec_per_key. So currently we cannot choose
+# index to use intelligently. Just test that we work as expected (select
+# first index, remember that unique keys are sorted first by server).
+CREATE TABLE t2 (a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, d INT, e INT,
+                 KEY wrong_key13(a),
+                 UNIQUE expected_key(e),
+                 KEY wrong_key14(c,b)) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d MOD 41, d MOD 37, d, IF(d<10, d, NULL) FROM t1;
+
+sync_slave_with_master;
+connection slave;
+--echo # Slave will crash if using the wrong or no index
+SET GLOBAL debug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
+
+connection master;
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+# Finally, test behaviour when no indexes are available at all.
+CREATE TABLE t2 (a INT NOT NULL, d INT) ENGINE=innodb;
+INSERT INTO t2 SELECT d DIV 10, d FROM t1;
+
+UPDATE t2 SET d=10042 WHERE d=42;
+DELETE FROM t2 WHERE d=53;
+
+sync_slave_with_master;
+connection slave;
+SELECT * FROM t2 WHERE d IN (10042,53);
+
+connection master;
+DROP TABLE t2;
+
+
+connection master;
+DROP TABLE t1;
+sync_slave_with_master;
+connection slave;
+SET GLOBAL debug="";

=== modified file 'sql/log_event.cc'
--- a/sql/log_event.cc	2010-12-01 20:24:49 +0000
+++ b/sql/log_event.cc	2010-12-27 21:37:37 +0000
@@ -7128,7 +7128,8 @@ Rows_log_event::Rows_log_event(THD *thd_
     m_width(tbl_arg ? tbl_arg->s->fields : 1),
     m_rows_buf(0), m_rows_cur(0), m_rows_end(0), m_flags(0) 
 #ifdef HAVE_REPLICATION
-    , m_curr_row(NULL), m_curr_row_end(NULL), m_key(NULL)
+    , m_curr_row(NULL), m_curr_row_end(NULL),
+    m_key(NULL), m_key_info(NULL), m_key_nr(0)
 #endif
 {
   /*
@@ -7176,7 +7177,8 @@ Rows_log_event::Rows_log_event(const cha
 #endif
     m_table_id(0), m_rows_buf(0), m_rows_cur(0), m_rows_end(0)
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
-    , m_curr_row(NULL), m_curr_row_end(NULL), m_key(NULL)
+    , m_curr_row(NULL), m_curr_row_end(NULL),
+    m_key(NULL), m_key_info(NULL), m_key_nr(0)
 #endif
 {
   DBUG_ENTER("Rows_log_event::Rows_log_event(const char*,...)");
@@ -9043,6 +9045,86 @@ record_compare_exit:
   return result;
 }
 
+
+/**
+  Find the best key to use when locating the row in @c find_row().
+
+  A primary key is preferred if it exists; otherwise a unique index is
+  preferred. Else we pick the index with the smalles rec_per_key value.
+
+  If a suitable key is found, set @c m_key, @c m_key_nr and @c m_key_info
+  member fields appropriately.
+
+  @returns Error code on failure, 0 on success.
+*/
+int Rows_log_event::find_key()
+{
+  uint i, best_key_nr, last_part;
+  KEY *key, *best_key;
+  ulong best_rec_per_key, tmp;
+  DBUG_ENTER("Rows_log_event::find_key");
+  DBUG_ASSERT(m_table && m_table->in_use != NULL);
+
+  best_key_nr= MAX_KEY;
+  LINT_INIT(best_key);
+  LINT_INIT(best_rec_per_key);
+
+  /*
+    Keys are sorted so that any primary key is first, followed by unique keys,
+    followed by any other. So we will automatically pick the primary key if
+    it exists.
+  */
+  for (i= 0, key= m_table->key_info; i < m_table->s->keys; i++, key++)
+  {
+    if (!m_table->s->keys_in_use.is_set(i))
+      continue;
+    /*
+      We cannot use a unique key with NULL-able columns to uniquely identify
+      a row (but we can still select it for range scan below if nothing better
+      is available).
+    */
+    if ((key->flags & (HA_NOSAME | HA_NULL_PART_KEY)) == HA_NOSAME)
+    {
+      best_key_nr= i;
+      best_key= key;
+      break;
+    }
+    /*
+      We can only use a non-unique key if it allows range scans (ie. skip
+      FULLTEXT indexes and such).
+    */
+    last_part= key->key_parts - 1;
+    DBUG_PRINT("info", ("Index %s rec_per_key[%u]= %lu",
+                        key->name, last_part, key->rec_per_key[last_part]));
+    if (!(m_table->file->index_flags(i, last_part, 1) & HA_READ_NEXT))
+      continue;
+
+    tmp= key->rec_per_key[last_part];
+    if (best_key_nr == MAX_KEY || (tmp > 0 && tmp < best_rec_per_key))
+    {
+      best_key_nr= i;
+      best_key= key;
+      best_rec_per_key= tmp;
+    }
+  }
+
+  if (best_key_nr == MAX_KEY)
+  {
+    m_key_info= NULL;
+    DBUG_RETURN(0);
+  }
+
+  // Allocate buffer for key searches
+  m_key= (uchar *) my_malloc(best_key->key_length, MYF(MY_WME));
+  if (m_key == NULL)
+    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+  m_key_info= best_key;
+  m_key_nr= best_key_nr;
+
+  DBUG_RETURN(0);;
+}
+
+
 /**
   Locate the current row in event's table.
 
@@ -9142,12 +9224,17 @@ int Rows_log_event::find_row(const Relay
    */ 
   store_record(table,record[1]);    
 
-  if (table->s->keys > 0 && table->s->keys_in_use.is_set(0))
+  if (m_key_info)
   {
-    DBUG_PRINT("info",("locating record using primary key (index_read)"));
-
-    /* The 0th key is active: search the table using the index */
-    if (!table->file->inited && (error= table->file->ha_index_init(0, FALSE)))
+    DBUG_PRINT("info",("locating record using key #%u [%s] (index_read)",
+                       m_key_nr, m_key_info->name));
+    /* We use this to test that the correct key is used in test cases. */
+    DBUG_EXECUTE_IF("slave_crash_if_wrong_index",
+                    if(0 != strcmp(m_key_info->name,"expected_key")) abort(););
+
+    /* The key is active: search the table using the index */
+    if (!table->file->inited &&
+        (error= table->file->ha_index_init(m_key_nr, FALSE)))
     {
       DBUG_PRINT("info",("ha_index_init returns error %d",error));
       table->file->print_error(error, MYF(0));
@@ -9157,14 +9244,14 @@ int Rows_log_event::find_row(const Relay
     /* Fill key data for the row */
 
     DBUG_ASSERT(m_key);
-    key_copy(m_key, table->record[0], table->key_info, 0);
+    key_copy(m_key, table->record[0], m_key_info, 0);
 
     /*
       Don't print debug messages when running valgrind since they can
       trigger false warnings.
      */
 #ifndef HAVE_valgrind
-    DBUG_DUMP("key data", m_key, table->key_info->key_length);
+    DBUG_DUMP("key data", m_key, m_key_info->key_length);
 #endif
 
     /*
@@ -9250,6 +9337,8 @@ int Rows_log_event::find_row(const Relay
       record we are looking for is stored in record[1].
      */ 
     DBUG_PRINT("info",("non-unique index, scanning it to find matching record")); 
+    /* We use this to test that the correct key is used in test cases. */
+    DBUG_EXECUTE_IF("slave_crash_if_index_scan", abort(););
 
     while (record_compare(table))
     {
@@ -9288,6 +9377,8 @@ int Rows_log_event::find_row(const Relay
   else
   {
     DBUG_PRINT("info",("locating record using table scan (rnd_next)"));
+    /* We use this to test that the correct key is used in test cases. */
+    DBUG_EXECUTE_IF("slave_crash_if_table_scan", abort(););
 
     int restart_count= 0; // Number of times scanning has restarted from top
 
@@ -9407,14 +9498,7 @@ Delete_rows_log_event::do_before_row_ope
     return 0;
   }
 
-  if (m_table->s->keys > 0)
-  {
-    // Allocate buffer for key searches
-    m_key= (uchar*)my_malloc(m_table->key_info->key_length, MYF(MY_WME));
-    if (!m_key)
-      return HA_ERR_OUT_OF_MEM;
-  }
-  return 0;
+  return find_key();
 }
 
 int 
@@ -9425,6 +9509,7 @@ Delete_rows_log_event::do_after_row_oper
   m_table->file->ha_index_or_rnd_end();
   my_free(m_key, MYF(MY_ALLOW_ZERO_PTR));
   m_key= NULL;
+  m_key_info= NULL;
 
   return error;
 }
@@ -9527,13 +9612,9 @@ Update_rows_log_event::Update_rows_log_e
 int 
 Update_rows_log_event::do_before_row_operations(const Slave_reporting_capability *const)
 {
-  if (m_table->s->keys > 0)
-  {
-    // Allocate buffer for key searches
-    m_key= (uchar*)my_malloc(m_table->key_info->key_length, MYF(MY_WME));
-    if (!m_key)
-      return HA_ERR_OUT_OF_MEM;
-  }
+  int err;
+  if ((err= find_key()))
+    return err;
 
   m_table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET;
 
@@ -9548,6 +9629,7 @@ Update_rows_log_event::do_after_row_oper
   m_table->file->ha_index_or_rnd_end();
   my_free(m_key, MYF(MY_ALLOW_ZERO_PTR)); // Free for multi_malloc
   m_key= NULL;
+  m_key_info= NULL;
 
   return error;
 }

=== modified file 'sql/log_event.h'
--- a/sql/log_event.h	2010-11-30 21:11:03 +0000
+++ b/sql/log_event.h	2010-12-27 21:37:37 +0000
@@ -3592,7 +3592,10 @@ protected:
   const uchar *m_curr_row;     /* Start of the row being processed */
   const uchar *m_curr_row_end; /* One-after the end of the current row */
   uchar    *m_key;      /* Buffer to keep key value during searches */
+  KEY      *m_key_info; /* Pointer to KEY info for m_key_nr */
+  uint      m_key_nr;   /* Key number */
 
+  int find_key(); // Find a best key to use in find_row()
   int find_row(const Relay_log_info *const);
   int write_row(const Relay_log_info *const, const bool);
 



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